.585" valve lift. IOG = gear drive cams with Inner & Outer drive Gears. Complete kit with installation hardware; bearings and gasket. Bolt-in 88" to 106" with 9.7:1 to 10.5 CR and 106" to 124" with 9:1 to 10:1 CR. 3500-6000 RPM for 88" to 103" and 2500-5500 for larger engines The gear drive system is in fact a revolutionary different and much more reliable construction. Especially in high lift/performance applications; when compared with the OEM chain-drive design. A gear driven camshaft is stronger and will not give any of the mechanical problems connected with the OEM chain driven camshafts. The S&S gear drive kit will increase valve timing accuracy; and therefore horsepower; by eliminating the timing chain lash and loosely fit stock cam gears. The only downside of gear drive is that you may experience a slight increase in mechanical sound; this is why OEM is using a chain. It has no other mechanical advantages whatsoever. Since the chain guides and tensioner are eliminated there is no longer the possibility for these parts to fail and damage other engine parts. The S&S gear drive kit reverses the direction of rotation of the rear cam; providing additional operating clearance between cam lobes. As a result; higher cam lifts are possible with the S&S gear driven cams. Note: With the exception of the 475G and 510G cam; adjustable pushrods (like MCS 503573) are required to compensate for the smaller camshaft base circle of these cams. Note: Material may have to be rem
.625" valve lift. IOG = gear drive cams with Inner & Outer drive Gears. Complete kit with installation hardware; bearings and gasket. 95"-up with 10.0:1 to 10.8:1 CR. The gear drive system is in fact a revolutionary different and much more reliable construction. Especially in high lift/performance applications; when compared with the OEM chain-drive design. A gear driven camshaft is stronger and will not give any of the mechanical problems connected with the OEM chain driven camshafts. The S&S gear drive kit will increase valve timing accuracy; and therefore horsepower; by eliminating the timing chain lash and loosely fit stock cam gears. The only downside of gear drive is that you may experience a slight increase in mechanical sound; this is why OEM is using a chain. It has no other mechanical advantages whatsoever. Since the chain guides and tensioner are eliminated there is no longer the possibility for these parts to fail and damage other engine parts. The S&S gear drive kit reverses the direction of rotation of the rear cam; providing additional operating clearance between cam lobes. As a result; higher cam lifts are possible with the S&S gear driven cams. Note: With the exception of the 475G and 510G cam; adjustable pushrods (like MCS 503573) are required to compensate for the smaller camshaft base circle of these cams. Note: Material may have to be removed from the inner surface of the OEM gear cover before installation of the S&S outer drive gears (which are
Fits OEM sized engines that have +.200" longer cylinders. Fits 103" engines with 5.750" long cylinders. Pushrods are adjustable and can be used as hydraulic or run as solids. Pushrod sets are manufactured of 7/16" O.D. chromoly steel tubing with pressed-in and heat treated steel ends. This combination provides maximum strength and durability; regardless of performance application. Note: Stock cylinders are 5.550" with cylinder height specifications based on crankcases with stock Evo B.T. deck height. Note: Some large bore S&S engines have crankcases with a higher deck height and therefore shorter cylinders but stil may require the same length pushrods.
With a silver aluminum finish. Will upgrade your stock 96" or 103" engine to 124" capacity. Kit comes complete with stroker flywheels; big bore cylinder & flat-top piston kit that gives a 10.8:1 CR with the included 91cc high flow heads. The 640 Easy Start gear driven cams provide the lift required to let this engine breathe but insures easy turn-over with stock starter & battery. Note 1: Stock cases must be machined to accept the larger 4-1/8" big bore cylinders. Kit adds .096" to engine height. Note 2: You will build a serious high performance engine. It is therefore not compatible with stock ignition and stock (too small) throttle housings. A large throttle housing; as the 558678 S&S 58mm single bore unit; and high performance ECU is required. Carbureted engines will require a ignition system with adjustable advance curves and large carburetor; as the S&S Super G or similar. Kits are machined to be compatible with stock length manifolds. Note 3: S&S recommends MCS 978519 JIMS crankcase bearing insert; for 03-17 Twin Cam models; to replace the stock roller bearing for the stronger early style Timken bearing. See MCS 978517 for required JIMS tool. The correct Timken bearing can be ordered as MCS 508960 / OEM 9028.
Forged Super Duty series for the Milwaukee Eight engine. With hard anodized crown and top ring groove to reflect heat and prevent ring to groove ''micro-welding''. The Line2Line abradable self-lubricating powder coating technique allows zero tolerance installation; final tolerance will be 0.003". The piston creates its own perfect tolerance during run-in; the coating automatically gives the tightest possible & perfect piston to cylinder fit for no piston rock and best possible ring seal. Note: Fits 114/117" M8 engines; cylinder must be bored to 4.125" big bore size. Case boring is not required; OEM weight so rebalancing is not required and works with stock 4.500" stroke. 10.9:1 CR. (with 88.6cc head volume). Piston weight: OEM. Piston pin weight 115gr.; offset: 0.025". Piston: +1.9cc/Flat top. Compression height: 1.083". Ring pack: 1.2mm 1.2mm 3.0mm. Bore 4 1/8" / Stroke stock 4.500".
Forged low compression Wiseco piston kit. 7:1 compression ration (stock is around 8:1) for improved reliability. Includes wrist pins; circlips and Hastings rings. Note: These Wiseco pistons will fit stock style Hastings rings with 1.2mm (0.047") top & middle ringlands and a 4.75mm oil ring.
Forged low compression Wiseco piston kit. 7:1 compression ration (stock is around 8:1) for improved reliability. Includes wrist pins; circlips and Hastings rings. Note: These Wiseco pistons will fit stock style Hastings rings with 1.2mm (0.047") top & middle ringlands and a 4.75mm oil ring.
High 10:1 compression ratio (standard is 9:1) for stock XL 1000 Sportster models. Will not fit XR style cylinder heads. Incl. forged pistons; wristpins; Hastings rings and circlips.
Forged high compression Wiseco piston kit. 9.5:1 compression ration (stock is around 8:1). Includes wrist pins; circlips and Hastings rings. Note: These Wiseco pistons will fit stock style Hastings rings with 1.2mm (0.047") top & middle ringlands and a 4.75mm oil ring.
Forged high compression Wiseco piston kit. 9.5:1 compression ration (stock is around 8:1). Includes wrist pins; circlips and Hastings rings. Note: These Wiseco pistons will fit stock style Hastings rings with 1.2mm (0.047") top & middle ringlands and a 4.75mm oil ring.
Forged aluminum. Domed 10:1 high compression piston kits include wrist pins; circlips and Hastings rings. Compatible with OEM heads. Note: Pistons will fit stock style Hastings rings with 1.6mm (0.062") top & middle ringlands and 4.0mm oil rings.
Replacement forged piston set. Fits all 100" and 107" 4" bore Super Sidewinder engines. Will also fit the special (out of production) 100" Evo type retro-fit engine for Shovel chassis; which is equipped with small diameter flywheels. Incl. pistons; wrist pins; wristpin clips and piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.
Replacement forged piston set. Fits all 100" and 107" 4" bore Super Sidewinder engines. Will also fit the special (out of production) 100" Evo type retro-fit engine for Shovel chassis; which is equipped with small diameter flywheels. Incl. pistons; wrist pins; wristpin clips and piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.
Replacement forged piston set. Incl. pistons; wrist pins; wristpin clips and piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.
Replacement forged piston set. Incl. pistons; wrist pins; wristpin clips and piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.
Replacement forged piston set. Incl. pistons; wrist pins; wristpin clips and piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.
Replacement forged piston set for 4" bore Super Sidewinder Evolution type S&S engines (excl. TC). Pistons include wrist pins; wrist pin clips and piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.
Replacement forged piston set for 4" bore Super Sidewinder Evolution type S&S engines (excl. TC). Pistons include wrist pins; wrist pin clips and piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.
Cast aluminum OEM style pistons for a stock 1200cc Side Valve rebuild. Pistons include wrist pins; retainers & piston rings. Note: In any and all applications the technician must be able to judge components for their suitability in combination with the other engine components; prior to installation. It is of importance that a knowledgeable mechanic will install & make adjustments as required. The rider must follow standard break-in and riding procedures for overhauled engines.
Kit includes JIMS polished and precision machined billet tappet guides; 4 Powerglide hydraulic tappets that are extra wide .761" dia. (OEM is .731" O.D.) and 4 JIMS Pro-Lite worksaver aerospace aluminum pushrods. This kit has a 3/8" lower seat for the pushrods; reducing the pushrod to tappet angle. With the great hydraulics found in the JIMS Power Glide tappets this kit is an excellent upgrade compared to any OEM or OEM style Shovelhead components. Note: For replacement hydraulic tappets for this kit see 961378 for Standard extra wide and 961379 for +.002" extra wide hydraulic Powerglide tappets.
This kit has a 3/8" lower seat for the pushrods; reducing the pushrod to tappet angle. Includes a set of two 7075-T651 chrome plated billet tappet blocks and a set of 4 large bore Powerglide big axle tappets. The tappets are special extra wide .761" outside diameter JIMS Powerglide tappets. Therefore OEM .731" diameter Powerglide Shovel tappets are not interchangeable. Note: 53-E76 Pan & Shovel models will require a tappet guide bolt conversion kit; like 502990 allen / 989173 Cap style / 513555 Acorn; that is correctly threaded for 53-E76 crankcases; so the bolt head will fit the flat L76-84 design of these JIMS tappet guides.
.030" MLS (Multi Layer Steel) head and .014" RCS (Rubber Coated Steel) base gaskets. 3.937" bore for stock 107" M8 engines. Kit to service one engine.
.040" MLS (Multi Layer Steel) head & .014" RCS (Rubber Coated Steel) base gaskets. Fits both oil cooled and water cooled heads. Special design allows the gasket to fit into the cylinder bore embossement... while even keeping the oil cooling port open on oil cooled heads. With this gasket the 4.250" big bore size is a true bolt-on application for both oil & water cooled M8 models. Kit to service one engine.
.030" MLS (multi Layer Steel) head & .014" RCS (Rubber Coated Steel) base gaskets. Fits both oil cooled and water cooled heads. Special design allows the gasket to fit into the cylinder bore embossement... while even keeping the oil cooling port open on oil cooled heads. With this gasket the 4.250" big bore size is a true bolt-on application for both oil & water cooled M8 models. Kit to service one engine.
.030" MLS (Multi Layer Steel) head & .020" RCS (Rubber Coated Steel) base gaskets. Fits both oil cooled and water cooled heads. Special design allows the gasket to fit into the cylinder bore embossement... while even keeping the oil cooling port open on oil cooled heads. With this gasket the 4.250" big bore size is a true bolt-on application for both oil & water cooled M8 models. Kit to service one engine.
.040" MLS (Multi Layer Steel) head gaskets & .014" RCS (Rubber Coated Steel) base gaskets. Fits Touring with water cooled heads without modifications. Made with embossing for water cooled heads only. Can be used up to 4.320" bore without mods or plugging the water cooled heads. Oil cooled heads must always be plugged on cylinder bores exceeding 4.250" since the oil cooling port is closer to the cylinder bore. Kit to service one engine.
.040" MLS (Multi Layer Steel) head & .020" RCS (Rubber Coated Steel) base gaskets. 4.500" bore. For water & oil cooled heads. Heads must be plugged. No embossing on heads for water or oil cooling ports but for bore & oil drain only. Therefore heads must be plugged or welded in all cases. Kit to service one engine.
.027" MLS (multi Layer Steel) head & .014" RCS (Rubber Coated Steel) base gaskets. 4.500" bore. For water & oil cooled heads. Heads must be plugged. No embossing on heads for water or oil cooling ports but for bore & oil drain only. Therefore heads must be plugged or welded in all cases. Kit to service one engine.
EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .030" thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020" thick and have .001" of high temperature Viton rubber coating on both sides. Kit comes with all gaskets; seals and o-ring for a complete top end rebuild. Fits Softail; Touring & Trike models with both oil cooled and water cooled heads. OEM replacement reference 25700729 gasket top end kit.
EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .040" thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020" thick and have .001" of high temperature viton rubber coating on both sides. Kit comes with all gaskets; seals and o-ring for a complete top end rebuild. Fits Softail; Touring & Trike models with both oil cooled and water cooled heads.
EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .030" thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020" thick and have .001" of high temperature viton rubber coating on both sides. Kit comes with all gaskets; seals and o-ring for a complete top end rebuild. Fits Softail; Touring & Trike models with both oil cooled and water cooled heads.
EST (Extreme Sealing Technology). With MLS (Multi-Layer-Steel) .030" thick head gaskets. The SLS (Single-Layer-Steel) cylinder base gaskets and SLS rocker cover gaskets used in these sets are .020" thick and have .001" of high temperature Viton rubber coating on both sides. Kit comes with all gaskets; seals and o-ring for a complete top end rebuild. Fits Softail; Touring & Trike models with both oil cooled and water cooled heads. Note: 23-up Gen 2 M8 engines have Center Cooled heads; which will not fit these head gaskets. Note: OEM H-D 114" has 4.016" bore; OEM H-D 117/121" have 4.075" bore.
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