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Precision-machined oil system packs for M8 engines that increase oil flow, scavenge volume and pressure while reducing temperatures and wet sumping. Includes pump, lifters, high-flow camplate and installation kit.
Replacement spring and plunger assembly for oil pump pressure relief valve — increases pop‑off psi and restores proper bypass control. Bench‑test with PART #3801-0071.
Retainer rings that secure oil pump components for reliable lubrication and service.
Complete right crankcase roller bearing assembly. Includes rollers and retainer. Made in the U.S.A.
Precision J-form cylinder stud kit with eight studs, moly assembly lubricant, and thread sealant. Stock replacement and reusable; manufactured by ARP® in the USA.
Stud and nut kit that reinforces rocker arm shaft standoffs to help prevent cylinder head cracking.
Precision mainshaft spacers made in the U.S.A., engineered for accurate shaft spacing and reliable performance.
Premium valve-train replacement components, precision machined for durability. Made in the U.S.A.
Complete gasket and bushing set for oil pump service. Made in the U.S.A.
Replacement OEM first gear thrust washers for reliable countershaft support and smooth shifting.
Durable piston pin clips for a wide range of Harley models. Meets or exceeds OEM specs. Made in the USA.