These performance replacement cylinder heads for 1984-’99 Evo Big Twins are designed to be compatible with a stock style flat topped piston. This set has a slightly larger 82 cc combustion chamber, making them ideal for larger displacement applications, producing a manageable compression ratio. These heads are original equipment on S&S V96 and V80 engines. Larger than stock 1.900” intake and 1.575” exhaust valves provide plenty of air while maintaining port velocity for good low and mid-range response. S&S high lift valve springs allow the installation of cams with up to .585” lift. Compatible with stock intake manifolds, exhaust systems and temperature sensors for EFI equipped models. Available in black, natural or polished aluminum finishes.
Replaces the stock cylinder heads. This kit contains everything needed to replace stock heads with the high flowing S&S Super Stock upgrades and optimize performance with the S&S 561 camshaft, chromoly steel adjustable pushrods and a Super E carburetor kit - complete with manifold and a high flow S&S teardrop air cleaner. The design of the Super Stock combustion chamber requires a special separately available domed piston to yield the optimum 10.2:1 compression ratio and to optimize combustion chamber turbulence for superior flame travel. Black or natural finish.
Originally designed for S&S 4-1/8 bore V-Series engines with piston oiler jets, these high volume, high pressure oil pumps also work well in stock Evo and S&S V-Series engines - they fit 1984-’91 H-D Big Twins. No thicker than a stock pump, gears with fewer but larger teeth provide increased oil volume for both supply and return sides of the pump. Supply gears are 9% wider than stock and standard S&S oil pumps; 28% wider than stock return gears ensure proper crankcase scavenging, reduce drag on the flywheels and eliminate oil carryover. Polished billet finish. Increased scavenging capacity results in less oil in the crankcase and less oil carryover - excess oil from the pressure control valve is filtered - and longer pump life. Equipped with a stock length oil pump drive shaft.
S&S CYCLE INC.