A:The Pontiac 151-inch (2.5L) L4 Iron Duke rocker arm fulcrum-to-tip distance is greater than a Chevy small-block, plus the Chevy small-block rocker has a 1.51:1 ratio, while the Pontiac uses a 1.71:1 ...

The Ford and Chevy 427 big blocks sit at the center of one of performance history’s fiercest rivalries, yet the two engines ...

Michael Rasmussen; Massaprqua, NY: I have a 454 big-block from a Chevy truck in my Chevelle. I just purchased the Edelbrock Performer RPM 60459 heads, an 800-cfm carb, and an Air-Gap manifold. I ...