{"title":"heads \u0026 parts","description":null,"products":[{"product_id":"retro-top-end-conversion-kit","title":"Retro Top End Conversion Kit","description":"Give your Shovelhead engine that nostalgic look of a Panhead. Kit consists of a set of S\u0026amp;S P-series cylinder heads with rocker cradles, S\u0026amp;S roller rocker arms, S\u0026amp;S hydraulic tappets, billet tappet guides, Quickee pushrods, pushrod cover clips and all required gaskets and hardware for assembly. Heads have a Shovelhead bolt pattern, making them compatible with any stock or aftermarket cylinders for 66-84 Big Twins; heads come complete with valves and .590\" lift valve springs. Accept stock or S\u0026amp;S O-ring-style manifolds for Shovelheads and any exhaust system made to fit a shovelhead engine. Kits do not include pan covers..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44419506110509,"sku":"FJHF_106-1071","price":4499.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300090_0.png?v=1765747538"},{"product_id":"retro-top-end-conversion-kit-1","title":"Retro Top End Conversion Kit","description":"Give your Shovelhead engine that nostalgic look of a Panhead. Kit consists of a set of S\u0026amp;S P-series cylinder heads with rocker cradles, S\u0026amp;S roller rocker arms, S\u0026amp;S hydraulic tappets, billet tappet guides, Quickee pushrods, pushrod cover clips and all required gaskets and hardware for assembly. Heads have a Shovelhead bolt pattern, making them compatible with any stock or aftermarket cylinders for 66-84 Big Twins; heads come complete with valves and .590\" lift valve springs. Accept stock or S\u0026amp;S O-ring-style manifolds for Shovelheads and any exhaust system made to fit a shovelhead engine. Kits do not include pan covers..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44419506339885,"sku":"FJHF_106-1070","price":3995.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300089_0.png?v=1765747553"},{"product_id":"cylinder-heads-twin-cam","title":"Cylinder Heads - Twin Cam","description":"High port flow gives great performance now, and more later when additional upgrades are done. Heads are fully assembled with springs and valves. Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications. 79cc heads work great with stock motors for 88\" to 103\" motors; 89cc heads work best for motors over 103\" or with high-compression pop-up pistons. 79cc have 1.940\" intake and 1.575\" exhaust valve and springs for up to .640\" lift; 89cc have 2.000\" intake and 1.605\" exhaust and .640\" springs. Heads are machined for compression releases unless noted otherwise (sold separately); S\u0026amp;S rocker boxes required when using S\u0026amp;S compression releases. Do not include rocker arm components, intake manifold or gaskets. Heads include four long headbolts, and reuse four long OEM headbolts. Accept OEM intake manifolds. Made in the U.S.A.. Must use S\u0026amp;S rocker boxes (PART #90-4110) if S\u0026amp;S compression releases are used.. Not compatible with Twin Cooled heads..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44419507421229,"sku":"FJHF_106-3227","price":2149.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300063_0.png?v=1765747607"},{"product_id":"cylinder-heads-twin-cam-1","title":"Cylinder Heads - Twin Cam","description":"High port flow gives great performance now, and more later when additional upgrades are done. Heads are fully assembled with springs and valves. Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications. 79cc heads work great with stock motors for 88\" to 103\" motors; 89cc heads work best for motors over 103\" or with high-compression pop-up pistons. 79cc have 1.940\" intake and 1.575\" exhaust valve and springs for up to .640\" lift; 89cc have 2.000\" intake and 1.605\" exhaust and .640\" springs. Heads are machined for compression releases unless noted otherwise (sold separately); S\u0026amp;S rocker boxes required when using S\u0026amp;S compression releases. Do not include rocker arm components, intake manifold or gaskets. Heads include four long headbolts, and reuse four long OEM headbolts. Accept OEM intake manifolds. Made in the U.S.A.. Must use S\u0026amp;S rocker boxes (PART #90-4110) if S\u0026amp;S compression releases are used.. Not compatible with Twin Cooled heads..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44419507486765,"sku":"FJHF_106-3233","price":1995.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300064_0.png?v=1765747613"},{"product_id":"cylinder-heads-twin-cam-2","title":"Cylinder Heads - Twin Cam","description":"High port flow gives great performance now, and more later when additional upgrades are done. Heads are fully assembled with springs and valves. Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications. 79cc heads work great with stock motors for 88\" to 103\" motors; 89cc heads work best for motors over 103\" or with high-compression pop-up pistons. 79cc have 1.940\" intake and 1.575\" exhaust valve and springs for up to .640\" lift; 89cc have 2.000\" intake and 1.605\" exhaust and .640\" springs. Heads are machined for compression releases unless noted otherwise (sold separately); S\u0026amp;S rocker boxes required when using S\u0026amp;S compression releases. Do not include rocker arm components, intake manifold or gaskets. Heads include four long headbolts, and reuse four long OEM headbolts. Accept OEM intake manifolds. Made in the U.S.A.. Must use S\u0026amp;S rocker boxes (PART #90-4110) if S\u0026amp;S compression releases are used.. Not compatible with Twin Cooled heads..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44419507716141,"sku":"FJHF_106-3240","price":1995.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300066_0.png?v=1765747621"},{"product_id":"performance-replacement-head","title":"Performance Replacement Head","description":"S\u0026amp;S heads are available to be used with stock-style flat-top pistons. Kits are fully assembled, and include stainless steel valves and high-lift (.585\") springs. Intake manifold and gasket kits are sold separately; gasket kits contain head gaskets, base gaskets and exhaust pipe gaskets (rocker box gaskets are not included due to the variety of available rocker box styles). Optimized for smaller displacement engines. Slight increase in compression (8.8:1 in an 80\" motor) with 82cc chamber volume. Port design increases flow, while maintaining velocity. Set up for .585\" maximum lift. EFI compatible. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44419507912749,"sku":"FJHF_106-3466","price":1559.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300060_0.png?v=1765747635"},{"product_id":"cylinder-heads-twin-cam-3","title":"Cylinder Heads - Twin Cam","description":"High port flow gives great performance now, and more later when additional upgrades are done. Heads are fully assembled with springs and valves. Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications. 79cc heads work great with stock motors for 88\" to 103\" motors; 89cc heads work best for motors over 103\" or with high-compression pop-up pistons. 79cc have 1.940\" intake and 1.575\" exhaust valve and springs for up to .640\" lift; 89cc have 2.000\" intake and 1.605\" exhaust and .640\" springs. Heads are machined for compression releases unless noted otherwise (sold separately); S\u0026amp;S rocker boxes required when using S\u0026amp;S compression releases. Do not include rocker arm components, intake manifold or gaskets. Heads include four long headbolts, and reuse four long OEM headbolts. Accept OEM intake manifolds. Made in the U.S.A.. Must use S\u0026amp;S rocker boxes (PART #90-4110) if S\u0026amp;S compression releases are used.. Not compatible with Twin Cooled heads..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44419509780525,"sku":"FJHF_106-4270","price":1995.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300068_0.png?v=1765747720"},{"product_id":"cylinder-heads","title":"Cylinder Heads","description":"High port flow gives great performance now, and more later when additional upgrades are done. Heads are fully assembled with springs and valves. Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications. 79cc heads work great with stock motors for 88\" to 103\" motors; 89cc heads work best for motors over 103\" or with high-compression pop-up pistons. 79cc have 1.940\" intake and 1.575\" exhaust valve and springs for up to .640\" lift; 89cc have 2.000\" intake and 1.605\" exhaust and .640\" springs. Heads are machined for compression releases unless noted otherwise (sold separately); S\u0026amp;S rocker boxes required when using S\u0026amp;S compression releases. Do not include rocker arm components, intake manifold or gaskets. Heads include four long headbolts, and reuse four long OEM headbolts. Accept OEM intake manifolds. Made in the U.S.A.. Must use S\u0026amp;S rocker boxes (PART #90-4110) if S\u0026amp;S compression releases are used.. Not compatible with Twin Cooled heads..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44419509911597,"sku":"FJHF_106-4277","price":2149.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300062_0.png?v=1765747734"},{"product_id":"performance-replacement-head-1","title":"Performance Replacement Head","description":"S\u0026amp;S heads are available to be used with stock-style flat-top pistons. Kits are fully assembled, and include stainless steel valves and high-lift (.585\") springs. Intake manifold and gasket kits are sold separately; gasket kits contain head gaskets, base gaskets and exhaust pipe gaskets (rocker box gaskets are not included due to the variety of available rocker box styles). Optimized for smaller displacement engines. Slight increase in compression (8.8:1 in an 80\" motor) with 82cc chamber volume. Port design increases flow, while maintaining velocity. Set up for .585\" maximum lift. EFI compatible. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44419510468653,"sku":"FJHF_106-4570","price":1559.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300061_0.png?v=1765747789"},{"product_id":"performance-replacement-head-2","title":"Performance Replacement Head","description":"S\u0026amp;S heads are available to be used with stock-style flat-top pistons. Kits are fully assembled, and include stainless steel valves and high-lift (.585\") springs. Intake manifold and gasket kits are sold separately; gasket kits contain head gaskets, base gaskets and exhaust pipe gaskets (rocker box gaskets are not included due to the variety of available rocker box styles). Optimized for smaller displacement engines. Slight increase in compression (8.8:1 in an 80\" motor) with 82cc chamber volume. Port design increases flow, while maintaining velocity. Set up for .585\" maximum lift. EFI compatible. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44419514466349,"sku":"FJHF_106-6064","price":1553.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300141_0.png?v=1765748122"},{"product_id":"performance-replacement-head-3","title":"Performance Replacement Head","description":"S\u0026amp;S heads are available to be used with stock-style flat-top pistons. Kits are fully assembled, and include stainless steel valves and high-lift (.585\") springs. Intake manifold and gasket kits are sold separately; gasket kits contain head gaskets, base gaskets and exhaust pipe gaskets (rocker box gaskets are not included due to the variety of available rocker box styles). Optimized for smaller displacement engines. Slight increase in compression (8.8:1 in an 80\" motor) with 82cc chamber volume. Port design increases flow, while maintaining velocity. Set up for .585\" maximum lift. EFI compatible. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44419514564653,"sku":"FJHF_106-6059","price":1468.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300154_0.png?v=1765748129"},{"product_id":"cylinder-head","title":"Cylinder Head","description":"Billet aluminum construction. Dramatically increased combustion efficiency. Radical combustion chamber design provides more horsepower with less chance of detonation. For low altitude operation with stock or modified engines.","brand":"Starting Line Products","offers":[{"title":"Default Title","offer_id":44466113675309,"sku":"FJLJ_12-850","price":535.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300179_0.png?v=1767492041"},{"product_id":"cylinder-head-kit-800-cfi-ho-axys-polaris","title":"Cylinder Head Kit - 800 CFI HO Axys - Polaris","description":"Increase cooling capacity for lower running temps which helps maintain peak power. For low altitudes 0 - 6000 feet.","brand":"Bikeman Performance","offers":[{"title":"Default Title","offer_id":44471636262957,"sku":"FGZT_04-315-L","price":449.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300171_0.png?v=1767710109"},{"product_id":"cylinder-head-kit-800-cfi-ho-axys-polaris-1","title":"Cylinder Head Kit - 800 CFI HO Axys - Polaris","description":"Increases cooling capacity for lower running temps which help maintain peak power. For high altitudes 6000 - 12000 feet.","brand":"Bikeman Performance","offers":[{"title":"Default Title","offer_id":44471636328493,"sku":"FGZT_04-316-H-RMK","price":550.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300172_0.png?v=1767710116"},{"product_id":"billet-head-kit-high-altitude-matryx-9r-polaris","title":"Billet Head Kit - High Altitude - Matryx 9R - Polaris","description":"Increase cooling capacity for lower running temps which helps maintain peak power. High altitude kit gains 8-9 horsepower in the mid-range and 7-8 peak. Works in the 6000 - 9000 foot altitude range. Tune is required for the R9.. 91 pump gas is required.. BPR9ES NGK spark plug is recommended by Bikeman Performance..","brand":"Bikeman Performance","offers":[{"title":"Default Title","offer_id":44471636394029,"sku":"FGZT_04-318-H-900","price":675.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300244_0.png?v=1767710123"},{"product_id":"billet-head-kit-low-altitude-matryx-9r-polaris","title":"Billet Head Kit - Low Altitude - Matryx 9R - Polaris","description":"Increase cooling capacity for lower running temps which helps maintain peak power. The low altitude kit gains 4-5 horsepower mid-range and peak horsepower. For sea level to 6000 foot altitude.. Tune is requried for the 9R.. 91 pump gas is required.. BPR9ES NGK spark plug is recommended by Bikeman Performance..","brand":"Bikeman Performance","offers":[{"title":"Default Title","offer_id":44471636459565,"sku":"FGZT_04-318-L-900","price":675.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300245_0.png?v=1767710129"},{"product_id":"exhaust-spigot-big-twin","title":"Exhaust Spigot - Big Twin","description":"Designed and machined from 6061 T-6 aluminum extruded tubing. Allows you to rebuild the exhaust attachment point on your classic Panhead engine. Welding required. Made in the U.S.A..","brand":"Kibblewhite Precision","offers":[{"title":"Default Title","offer_id":44570365722669,"sku":"FHRX_20-2104","price":11.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300059_0.png?v=1769615649"},{"product_id":"air-injection-kit","title":"Air Injection Kit","description":"Allow removal of unsightly lines and hoses. Clean up the look of your engine. Reduce backfire. Do not require re-tuning of carburetors or fuel injection systems. Blend seamlessly with engine. Easily installed by most owners. Removal of this system may not be legal in some states. Made in the U.S.A..","brand":"Baron Custom Accessories","offers":[{"title":"Default Title","offer_id":44879836807213,"sku":"FGZD_BA-2521-00","price":31.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300053_0.png?v=1777264845"},{"product_id":"air-injection-kit-1","title":"Air Injection Kit","description":"Allow removal of unsightly lines and hoses. Clean up the look of your engine. Reduce backfire. Do not require re-tuning of carburetors or fuel injection systems. Blend seamlessly with engine. Easily installed by most owners. Removal of this system may not be legal in some states. Made in the U.S.A..","brand":"Baron Custom Accessories","offers":[{"title":"Default Title","offer_id":44879836872749,"sku":"FGZD_BA-2551-00","price":31.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300067_0.png?v=1777264853"},{"product_id":"air-injection-kit-2","title":"Air Injection Kit","description":"Allow removal of unsightly lines and hoses. Clean up the look of your engine. Reduce backfire. Do not require re-tuning of carburetors or fuel injection systems. Blend seamlessly with engine. Easily installed by most owners. Removal of this system may not be legal in some states. Made in the U.S.A..","brand":"Baron Custom Accessories","offers":[{"title":"Default Title","offer_id":44879836971053,"sku":"FGZD_BA-2571-00","price":31.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300055_0.png?v=1777264860"},{"product_id":"exhaust-port-stud","title":"Exhaust Port Stud","description":"Four required per engine, sold each. Zinc-plated. 5\/16\"-18, 5\/16\"-24 1.910\". Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44905867935789,"sku":"FJHF_50-0493","price":8.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300136_0.png?v=1777913627"},{"product_id":"replacement-silicone-solenoid-caps","title":"Replacement Silicone Solenoid Caps","description":"Replacement silicone solenoid caps for S\u0026amp;S electronic and manual compression release kits. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44905869410349,"sku":"FJHF_50-1080","price":12.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300041_0.png?v=1777913634"},{"product_id":"cylinder-head-kit-big-twin","title":"Cylinder Head Kit - Big Twin","description":"S\u0026amp;S heads give great performance, and work with additional upgrades. Kits are fully assembled, and include stainless steel valves and high-lift springs (up to .640 lift). Intake manifold, pistons and gasket kits are sold separately; gasket kits contain head gaskets, base gaskets and exhaust pipe gaskets (rocker box gaskets are not included due to the variety of available rocker box styles). Must reuse stock headbolts. S\u0026amp;S Super Stock piston kits are required and include 10:1 ratio pistons, rings, piston pins and clips (sold separately in pairs). Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906027581485,"sku":"FJHF_90-1004","price":1949.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300007_0.png?v=1777914873"},{"product_id":"cylinder-head-kit","title":"Cylinder Head Kit","description":"Heads come completely assembled with valve seats, valves, guides, seals, .590\" lift valve springs, collars and valve keepers. Kit also includes rocker cover gaskets, head gaskets, exhaust flange gaskets and hardware for rocker housings, top engine mount and carb support bracket with instructions. Use OEM manifolds and exhaust. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906031579181,"sku":"FJHF_90-1499","price":1895.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300134_0.png?v=1777914886"},{"product_id":"cylinder-head-kit-big-twin-1","title":"Cylinder Head Kit - Big Twin","description":"Heads come completely assembled with valve seats, valves, guides, seals, .590\" lift valve springs, collars and valve keepers. Kit also includes rocker cover gaskets, head gaskets, exhaust flange gaskets and hardware for rocker housings, top engine mount and carb support bracket with instructions. Use OEM manifolds and exhaust. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906040655917,"sku":"FJHF_90-1496","price":1723.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300015_0.png?v=1777914907"},{"product_id":"cylinder-head-kit-big-twin-2","title":"Cylinder Head Kit - Big Twin","description":"Heads come completely assembled with valve seats, valves, guides, seals, .590\" lift valve springs, collars and valve keepers. Kit also includes rocker cover gaskets, head gaskets, exhaust flange gaskets and hardware for rocker housings, top engine mount and carb support bracket with instructions. Use OEM manifolds and exhaust. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906053009453,"sku":"FJHF_90-1491","price":1895.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300013_0.png?v=1777914929"},{"product_id":"cylinder-head-kit-big-twin-3","title":"Cylinder Head Kit - Big Twin","description":"Heads come completely assembled with valve seats, valves, guides, seals, .590\" lift valve springs, collars and valve keepers. Kit also includes rocker cover gaskets, head gaskets, exhaust flange gaskets and hardware for rocker housings, top engine mount and carb support bracket with instructions. Use OEM manifolds and exhaust. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906059857965,"sku":"FJHF_90-1497","price":1899.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300017_0.png?v=1777914943"},{"product_id":"cylinder-head-kit-big-twin-4","title":"Cylinder Head Kit - Big Twin","description":"Heads come completely assembled with valve seats, valves, guides, seals, .590\" lift valve springs, collars and valve keepers. Kit also includes rocker cover gaskets, head gaskets, exhaust flange gaskets and hardware for rocker housings, top engine mount and carb support bracket with instructions. Use OEM manifolds and exhaust. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906065068077,"sku":"FJHF_90-1498","price":1723.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300009_0.png?v=1777914963"},{"product_id":"cylinder-heads-twin-cam-4","title":"Cylinder Heads - Twin Cam","description":"High port flow gives great performance now, and more later when additional upgrades are done. Heads are fully assembled with springs and valves. Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications. 79cc heads work great with stock motors for 88\" to 103\" motors; 89cc heads work best for motors over 103\" or with high-compression pop-up pistons. 79cc have 1.940\" intake and 1.575\" exhaust valve and springs for up to .640\" lift; 89cc have 2.000\" intake and 1.605\" exhaust and .640\" springs. Heads are machined for compression releases unless noted otherwise (sold separately); S\u0026amp;S rocker boxes required when using S\u0026amp;S compression releases. Do not include rocker arm components, intake manifold or gaskets. Heads include four long headbolts, and reuse four long OEM headbolts. Accept OEM intake manifolds. Made in the U.S.A.. Must use S\u0026amp;S rocker boxes (PART #90-4110) if S\u0026amp;S compression releases are used.. Not compatible with Twin Cooled heads..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906077093933,"sku":"FJHF_90-1293","price":1815.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300058_0.png?v=1777915018"},{"product_id":"valve-spring-shim","title":"Valve Spring Shim","description":".574\" x 1.450\" x .030\". Black, steel construction. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906081189933,"sku":"FJHF_90-2087","price":7.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300138_0.png?v=1777915031"},{"product_id":"cylinder-heads-twin-cam-5","title":"Cylinder Heads - Twin Cam","description":"High port flow gives great performance now, and more later when additional upgrades are done. Heads are fully assembled with springs and valves. Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications. 79cc heads work great with stock motors for 88\" to 103\" motors; 89cc heads work best for motors over 103\" or with high-compression pop-up pistons. 79cc have 1.940\" intake and 1.575\" exhaust valve and springs for up to .640\" lift; 89cc have 2.000\" intake and 1.605\" exhaust and .640\" springs. Heads are machined for compression releases unless noted otherwise (sold separately); S\u0026amp;S rocker boxes required when using S\u0026amp;S compression releases. Do not include rocker arm components, intake manifold or gaskets. Heads include four long headbolts, and reuse four long OEM headbolts. Accept OEM intake manifolds. Made in the U.S.A.. Must use S\u0026amp;S rocker boxes (PART #90-4110) if S\u0026amp;S compression releases are used.. Not compatible with Twin Cooled heads..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906088529965,"sku":"FJHF_90-1106","price":1795.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300006_0.png?v=1777915059"},{"product_id":"cylinder-head-kit-big-twin-5","title":"Cylinder Head Kit - Big Twin","description":"S\u0026amp;S heads give great performance, and work with additional upgrades. Kits are fully assembled, and include stainless steel valves and high-lift springs (up to .640 lift). Intake manifold, pistons and gasket kits are sold separately; gasket kits contain head gaskets, base gaskets and exhaust pipe gaskets (rocker box gaskets are not included due to the variety of available rocker box styles). Must reuse stock headbolts. S\u0026amp;S Super Stock piston kits are required and include 10:1 ratio pistons, rings, piston pins and clips (sold separately in pairs). Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906090463277,"sku":"FJHF_90-1504","price":1799.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300008_0.png?v=1777915067"},{"product_id":"compression-release-hole-plug","title":"Compression Release Hole Plug","description":"Not for use on OEM heads. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906102652973,"sku":"FJHF_90-4916","price":24.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/20099082_0.png?v=1777915114"},{"product_id":"cylinder-heads-1","title":"Cylinder Heads","description":"High port flow gives great performance now, and more later when additional upgrades are done. Heads are fully assembled with springs and valves. Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications. 79cc heads work great with stock motors for 88\" to 103\" motors; 89cc heads work best for motors over 103\" or with high-compression pop-up pistons. 79cc have 1.940\" intake and 1.575\" exhaust valve and springs for up to .640\" lift; 89cc have 2.000\" intake and 1.605\" exhaust and .640\" springs. Heads are machined for compression releases unless noted otherwise (sold separately); S\u0026amp;S rocker boxes required when using S\u0026amp;S compression releases. Do not include rocker arm components, intake manifold or gaskets. Heads include four long headbolts, and reuse four long OEM headbolts. Accept OEM intake manifolds. Made in the U.S.A.. Must use S\u0026amp;S rocker boxes (PART #90-4110) if S\u0026amp;S compression releases are used.. Not compatible with Twin Cooled heads..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906108321837,"sku":"FJHF_900-0349","price":1795.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09031292_0.png?v=1777915133"},{"product_id":"replacement-electric-compression-release-assembly","title":"Replacement Electric Compression Release Assembly","description":"Electric compression releases open when you press the start button and close when the button is released. Includes replacement compression assembly, Deutsch connector, orange connector wedge, black vinyl tube and a silicone cap. For ease of installation and removal, a special socket can be purchased separately. Not for use on OEM heads. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906109796397,"sku":"FJHF_90-4914","price":193.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300135_0.png?v=1777915141"},{"product_id":"super-stock™-cylinder-heads-twin-cam-black","title":"Super Stock™ Cylinder Heads - Twin Cam - Black","description":"High port flow gives great performance now, and more later when additional upgrades are done. Heads are fully assembled with springs and valves. Compression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications. 79cc heads work great with stock motors for 88\" to 103\" motors; 89cc heads work best for motors over 103\" or with high-compression pop-up pistons. 79cc have 1.940\" intake and 1.575\" exhaust valve and springs for up to .650\" lift; 89cc have 2.000\" intake and 1.605\" exhaust and .640\" springs. 79cc heads accept OEM rocker boxes. 79cc and 89cc heads require S\u0026amp;S Lower Rocker Box Gasket Kit (0934-4574). Heads are machined for compression releases (sold separately); S\u0026amp;S rocker boxes required when using S\u0026amp;S compression releases. Do not include rocker arm components, intake manifold or gaskets. Heads include four long headbolts, and reuse four long OEM headbolts. Accept OEM intake manifolds. Made in the U.S.A.. Must use S\u0026amp;S rocker boxes (PART #90-4110) if S\u0026amp;S compression releases are used..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906111270957,"sku":"FJHF_900-0251","price":1795.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300139_0.png?v=1777915148"},{"product_id":"compression-release-kit","title":"Compression Release Kit","description":"Electric compression releases open when you press the start button and close when the button is released. Manual compression releases are opened manually and close when the motor starts. Kits include the required parts for installation. For ease of installation and removal, a special socket can be purchased separately. Not for use on OEM heads. Made in the U.S.A..","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906113859629,"sku":"FJHF_90-4915","price":448.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/20099080_0.png?v=1777915161"},{"product_id":"breather-head-kit-billet-anodized-blue-m8","title":"Breather Head Kit - Billet Anodized Blue - M8","description":"Replaces stock plastic. Dual O-ring for a better seal in the head. Unique Labyrinth design to reduce oil pass-through. Burns less oil to reduce emissions. Increased durability over stock.","brand":"S\u0026S Cycle","offers":[{"title":"Default Title","offer_id":44906136010797,"sku":"FJHF_900-1186","price":299.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0608\/4057\/5021\/files\/09300243_0.png?v=1777915276"}],"url":"https:\/\/shopronayers.com\/collections\/heads-parts.oembed","provider":"Ron Ayers Motorsports","version":"1.0","type":"link"}