12691728 - GM Performance SBC Cast Iron Vortec Cylinder Head - Complete

Formerly #12558060. Americas favorite high-performance cast iron small block cylinder head offers big power and bigger value.
The Vortec cylinder heads fast burn combustion chamber and high velocity ports combine to produce big horsepower out of the box.
The Vortec head can be mildly ported for additional performance and can be milled up to .040"for increased compression ratio.
The Vortec head uses 1.94" intake valves and 1.50" exhaust valves to compliment the high velocity port design.
The Vortec head out flows the Bow tie head out of the box and is a 20 to 40 horsepower bolt on increase over earlier cast iron small block heads. The Vortec requires a Vortec style intake manifold due to its improved manifold mounting flange and gasket design and raised intake ports. Manifolds available are P/N 12366573, 12496820, 1249621, 12496822 & Edelbrock 2116,7116,7516,2913. Vortec heads fit all small block engines produced 1955 to present, excluding LT1/LT4 reverse coolant flow engines and current LS1 style engines. Heads come completly assembled with valves, springs, retainers, and 3/8" rocker studs.
Requires the use of selfaligning rocker arms. The valves seats in these heads can be machined to 2.02" intake and 1.60" exhaust. The rocker arm studs can be pinned or drilled and tapped 3/8".


1.94" intake
1.50" Exhust
Combustion chanmber Volume 64cc
Intake runner volume -170cc
Exhaust runner volume-61cc

Straight spark plugs

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