If all the rocker arm and push rods are ok, then you need to check the camshaft. If the heads are still off turn the engine and check every lifter to be sure they move up the same amount. A flat lobe on the cam will cause a back fire.
A forum community dedicated to 1st generation Chevy Camaros owners and enthusiasts. Come join the discussion about performance, builds, restoration, modifications, classifieds, troubleshooting, reviews, and more!