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79cc Super Stock® Head Kit

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Product Reviews

S&S 79cc cylinder heads are intended for stock engines and other small displacement applications. These heads are compatible with stock Harley-Davidson® rocker covers. Must use S&S valve cover gasket kit part #90-4124 with stock rocker covers. They are a very economical performance upgrade designed for use with other performance enhancers and are machined to accept S&S® compression releases. For 1999-'05 Big tins with stock rocker covers.

Features and Benefits:

  • Heads can be decked up to .060" to increase compression
  • 79cc heads 1.940" intake and 1.575" exhaust valves
  • S&S .640" lift valve springs
  • Stock Harley-Davidson® rocker boxes can be retained if S&S manual compression release or S&S Easy Start cams are used. Must use S&S valve cover gasket kit part #90-4120 with stock rocker covers
  • Silver power coat or wrinkle black powder coat finish
Compression Ratios for S&S® Super Stock® Cylinder Heads
for 1999–Up Big Twins
Engine Displacement & Configuration   Chamber Volume  
  79cc   89cc  
88"   9.1   8.3  
95"   9.6/10.3*   8.7/9.3*  
Stock 2007–up 96"   9.8   8.9  
97" Big Bore   10.3   9.4  
103"   10.2/11.1*   9.3/10.1*  
106" Stroker   10.7   9.8  
106" Top End Kit   10.6   9.7  
110"   10.8   9.8  
*S&S pop-up piston 


Silver. . . . 106-4277
Black. . . . 90-1293


Notes 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 valve cover gasket kit part #90-4120 with stock rocker covers.

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