Last month, we showed you how the Comp Cams retro valve train setup was an easy add-on that will allow the engine to operate like a modern small-block straight from the dealer. This month, Jerry at Ace Machine in Riverside, California, finished the 383-c.i.d. engine build and topped it off with accessories from Milodon, Professional Products, Demon Carburetor and RHS.

This engine build was too complex to try to show you what Jerry did all at once, so we opted to present it in two parts, which gave us enough space to actually show you some dyno time. These engines can be built fairly easily, but tuning is most important; a few minor adjustments can make a world of difference. So when we were offered a chance to get on that dyno, we were ready to roll.

This engine build got interesting when Comp Cams offered us the opportunity to dyno their products on a new GM Performance 290-c.i.d. crate engine block that was designed to produce about 295 horsepower. On the first run, our combination gave us about 370 horsepower. By the time that Steve of Westech Performance Group in Ontario, California, got his hands on it, this small-block was pushing better than 400 horsepower just by being tuned! Now follow along as we show you how this Comp Cams build came together.