Engine - Cylinder Heads - Cast Iron Vortec Cylinder Head Assembly

From GM Performance - America's favorite high performance cast iron small block cylinder head offer big power and higger 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 inch for increased compression ratio. The Vortec head uses 1.94 inch intake valves and 1.50 inch exhaust valves to compliment the high velocity port design. Technical Note: The valves seats in these heads can be machined to 2.02 inch intake and 1.60 inch exhaust. The rocker arm studs can be pinned or drilled and tapped 3/8 inch. (casting P/N 10239906 or 12558062).