The bolt-on Rocker arms and new intake in place, we replaced the Chevelle's original Quadrajet mixer with a 525-cfm Road Demon vacuum secondary carb (64/78 jets). $357
The '70 Chevelle now fitted with the Lunati rocker arms and Edelbrock intake manifold. Power measured at the rear wheels.
This was a tough one--Demon recommends its carbs for modified engines, not a factory cammed, low-compression stocker like we flogged here. Although peak gains were minimal, average power was improved through the powerband. This carb also gives us a good, easily tunable foundation to work with as more extensive modifications are made to this engine.
Doug's Headers with 15/8-inch primary tubes and 3-inch collectors. $530
The '70 Chevelle now fitted with the Lunati rocker arms, Edelbrock intake manifold, and Road Demon carb. Power measured at the rear wheels.
Our intake/carb combo got more air/fuel mixture flowing into the old Chevelle; the new headers evacuate the burnt gases much more efficiently than the factory cast-iron pieces. Another jump in power was the result.