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 debate over the optimum rocker arm ratio to use has dragged on probably since the invention of the pushrod V-8. Even though Chevrolet made the decision easy for us when it engineered the original ...

Any gearhead worth his or her salt knows that whether it's a SOHC, DOHC, or OHV engine, the camshaft is considered the brain of a four-cycle internal combustion power plant. The camshaft's profile ...

Changing the rocker arms in your C5 or C6 Corvette may not deliver the dramatic results that a cam swap can, but it's a lot less work. And the power increases you'll experience make the change a good ...