I am a Chevy guy and I always wondered why the aftermarket didnt produce more stuff for the Cleveland 4V. The head design for racing is probably the best thing going (full race motor) to make power. If you look at the DRCE GM pro stock head it is so close to a Cleveland layout its almost a twin!The cleveland 4V is not good for the street (to big without compression and gears) but with the exhaust side corrected it is a super design. They say that the cleveland head was a copy of the BBC head but I am not so sure of that, if anyone knows it would be interesting to hear.