S&amp,S Cycle Complete Gear Drive 510G Camshaft Kit 33-5177 Manufacturer Part No. 33-5177 Convert your Twin Cam to a gear drive Kit includes cams, gears both inner and outer, gaskets, bearings, bolts and heavy-duty bearing plate Designed as a bolt in cam for 88in. to 103in. engines with compression ratios below 9.7:1 Intended primarily for stock heads that have not been ported Intake Opening (degrees): 20