14. Here’s where soda really shines. This old ’60s-era Holley 780 is in desperate need of help, but you don’t want to hit those soft zinc bowls or the aluminum base with an aggressive media like carbon or glass. Soda gives these parts the gentle treatment, preserving stamped numbers and casting detail, while cutting the corrosion. Holley uses media blasting for its Custom Shop rebuilds. A little practice and you’ll get the feel of the right range and speed. Steel parts, like the linkages and bolts, will need a heavier cut.