The rocker arm is possibly the third most abused part in your engine. The connecting rods take the cake for the most abuse, followed closely by the piston assembly, but we like to think the rocker ...

This pump-gas, 470-inch big-block Mopar we recently started working on was originally built with factory-style, 1.50:1-ratio rocker arms. The 1.50 rocker arms were working just fine, but we ...

I took the vehicle to a shop, which told me I had two rocker arms blown right out of the head, and two more were working their way loose. The mechanic was able to get them back in, and the car is ...

Valve covers with drip rails came stock on most high-performance big-block engines back in the classic muscle-car era, but started going away by the early 1970s during the dismal smog era when ...

The Petty GMS cars were found to be in violation of Section 14.6.5.E Rocker Box Assemblies of the NASCAR rulebook, which states that the rocker box vent hole in the front tire extraction area ...