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 advances produced by the requirements of Pro Stock have been a bellwether for all other users of modified racing engines; that is, all other users who wish to remain competitive. Insatiable ...