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 ...

Hot rod builds a mouse trap and tries to catch a rat. Originally published in the August 1998 issue of Hot Rod magazine. To celebrate HOT ROD's 75th anniversary, we teamed up with CASTROL GTX to bring ...

One of the most common mistakes when building a Chevy engine is neglecting to check the rocker arm geometry. This is usually due to the name of the procedure being misleading and implying the ...