79cc Super Stock™ Cylinder Head

High port flow gives great performance now, and more later when additional upgrades are doneHeads are fully assembled with springs and valvesCompression ratios vary depending on cylinder heads chosen, pistons used and engine displacement; see Compression Ratios chart for specifications79cc heads work great with stock motors for 88" to 103" motors; 89cc heads work best for motors over 103" or with high-compression pop-up pistons79cc have 1.940" intake and 1.575" exhaust valve and springs for up to .650" lift; 89cc have 2.000" intake and 1.605" exhaust and .640" springs79cc heads accept OEM rocker boxes79cc and 89cc heads require S&S Lower Rocker Box Gasket Kit (0934-4574)Heads are machined for compression releases (sold separately); S&S rocker boxes required when using S&S compression releasesDo not include rocker arm components, intake manifold or gasketsHeads include four long headbolts, and reuse four long OEM headboltsAccept OEM intake manifoldsMade in the U.S.A.Must use S&S rocker boxes (PART #90-4110) if S&S compression releases are used.