Small Block Chevy Bow Tie Small Port Cast Iron Vortec Cylinder Heads are Chevrolet Performance's most powerful cast iron cylinder head designed for street or race applications in the 400-450 horsepower range. As upgraded production heads, they have a thicker deck surface, small runners, bigger valves, and combustion chambers with exceptional low-lift flow numbers. These cylinder heads provide Chevy's Fast Burn performance in an affordable cast iron option.
No heat risers
Intake Ports: 185cc
Exhaust Ports: 65cc
Deck Thickness: .450''
Popular in short track racing
Combustion Chambers: 66cc
Hardened exhaust valve seats
Machined for 2.00''/1.55'' valves
Drilled & tapped for 7/16''-14 screw-in studs
.530'' maximum valve lift without modification
Cast Logos: Vortec (intake port roof), GM (intake port floor), Bow Tie (exhaust side)
Dual bolt patterns for: perimeter and centerbolt valve covers & early model and Vortec intake manifolds