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When 79cc stock compatible heads are used with stock H-D pistons, TDC lifts of up to .186" for intake and .179" for exhaust and can be used without additional valve pocket clearancing. This allows the use of S&S 510, 570, and 585 camshafts. If cams with higher TDC lifts are used, or if the heads are decked, piston valve pocket machining will be required. 79cc heads may be decked as much as .060" to increase compression. If heads are decked, piston valve pockets must be re-machined. Moderate valve spring force in S&S Super Stock cylinder heads allows the use of camshafts designed for the stock style chain cam drive system. However, for maximum reliability and performance we recommend the S&S gear drive cams. Must use S&S rocker base gasket kit part #90-4120 with stock rocker covers.
89cc:If 89cc heads are used with stock pistons, valve reliefs must be machined in the pistons due to larger valve size. 89cc heads may be decked as much as .060" to increase compression. If heads are decked, valve-to-piston clearance must be checked. If stock pistons are used, valve pockets must be re-machined. Moderate valve spring force in S&S Super Stock cylinder heads allows the use of camshafts designed for the stock style chain cam drive system. However, for maximum reliability and performance we recommend the S&S gear drive cams. A larger intake manifold is recommended to supplement the heads in order to let them flow to their full potential. Must use S&S rocker base gasket kit part #90-4120 with stock rocker covers.
Assembled Super Stock head kit for 1984–'99 Harley-Davidson® big twin engines feature high flowing ports and a specially shaped combustion chamber and contoured piston dome are what make makes these heads produce power. The increased "squish" area of this design sets up a controlled turbulence in the combustion chamber. That turbulence improves flame travel for a more efficient burn and reduced detonation. Special Super Stock pistons are required. Pistons are available in 3-1/2" and 3-5/8" bore to achieve various displacements and compression ratios. Pistons must be ordered separately.
S&S Cycle cylinders are easy to assemble kits for those who want to improve the performance of their engine. These are great cylinders that fit easily on your engine and will help rebuild the top end for better bike performance. They are made to be strong and durable, reducing damages that may be caused through rough handling and the intense power produced by high performance engines. These are custom made motorcycle cylinders and they will therefore use the stock chain drive system. Another advantage of custom made products is that they make installation easy and quick.