This is a dual 4 tunnel ram on a 383 Chevy street engine. Although tunnel rams are designed for high-end horsepower, we can certainly get them to run nice on the street too. We do just about ANY kind of engine you can think of. Want one of these for an all out drag car? No problem. Want one for a '32 Roadster street cruiser? No problem. The trick is knowing what set-up works best to accent the tunnel ram so it runs like it's supposed to. The problem is, most people don't have a CLUE about that sort of thing which is why so many "hot rods" with engines that look similar to one of ours get their doors blown off. There's a LOT more than just bolting a bunch of cool looking parts on an engine to get it to run nice. Luckily, we DO know what is required so you can be confident you'll get a KILLER running engine from us EVERY time.