the compression could blow the engine if i goes to high but if it doesn't u'll have one that will go fast u just have to set it up right i have living proof of that put a Chevy 305 head on a Chevy 350 block and it will boost the compression and give u bout an extra 75 hp at the least and from what I've seen it works for anything (well almost anything)saying that never try it on a lawnmower my uncle did that it wasn't good