Much has been said about the differences between rectangular ports and oval ports, and the only fact that everyone agrees with is that each design has its own strengths and weakn… See more

Big-block heads all had closed combustion chambers, or bathtub-shaped chambers, when … See more

All production big-block heads have similar characteristics, including 7/16- inch rocker studs (except Gen V and Gen VI) and the same seven-bolt valve cover pattern. Early cast-iron a… See more

The vast majority of aftermarket heads are rectangular port aluminum with open combustion chambers, similar to the fabled LS6/LS7 production heads. However, they are much … See more