This is New OEM LT4 Aluminum Cylinder Heads for your LT1 to LT4 Conversion. 

These heads deliver!

Chevrolet: 5.7L LT1/LT4, 54.4cc combustion chambers, 195cc intake runner, 2.00 in./1.55 in. diameter intake/exhaust valves, angled spark plugs, assembled, LT4 cylinder head

This Generation 2 aluminum cylinder head is the same head used on the 1996 Grand Sport Corvette. It's made for use on all LT1 and LT4 engines and features 54.4cc combustion chambers, lightweight 2.00 in. intake/1.55 in. exhaust valves, and 195cc intake runners. When used with the complete LT1-to-LT4 conversion package, this head has the potential to produce 430+ HP. It is sold completely assembled with valves, springs, locks, seals, rocker studs, retainers, and shims.

Price is per PAIR and shipping is not included.