2.375 Intake, 1.850 Exhaust
Chamber size starts at 120cc and can be milled to 112cc
Standard seats are ductile iron intake and alloy exhaust, alloy intake seat upgrade is available.
Manganese bronze guides
Minimum bore is 4.500 but works best with 4.580-4.625
Rockers are offered from both Jesel (#284139) and T&D (#3124)
Springs are Manley 221425-16 Installed at 2.100 with 280# at seat and 800# open at .900 lift. Upgrade to triple Manley or PAC is available.
474cfm Intake 350cfm Exhaust @ .900 lift