J&P Part: 434-566
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• If 89cc heads are used with stock pistions, valve reliefs in the pistons must be machined.• Both 89cc and 79cc 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 remachined.• Moderate valve spring force in S&S Cycle 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 Cycle gear drive cams.• S&S Cycle cylinder heads with 79cc and 89cc chambers use different valve sizes so it is important to order the correct replacement valves. Valves have part numbers etched below the keeper grooves for easy identification.