GM 781 Cylinder Head Prep and Overview 620 HP Street Strip 454 Big Block Chevy
Trick Flow designed the PowerPort 270 heads to use all factory-style big block Mopar pistons, roller rocker arms, and headers. A Max Wedge-style intake manifold is recommended for best performance. Trickflow powerport cnc ported cylinder head big block mopar 270cc max lift. 680 exhaust valves included yes exhaust valve diameter (in) 1.760 in.