Chevrolet Performance 19331429 - Bowtie 572/620 Cylinder Head Assembly

• Aluminum head assembly • Used in the 572/620 Chevrolet Performance crate engine • Completely assembled with 2.250"/1.880" 11/32" stem valves • Valve springs for hydraulic roller cams for up to .632" lift • 310cc rectangular intake port • 118cc exhaust port – raised 5/8" • 118cc combustion chamber • Not recommended for engines smaller than 572 cid