If you stop and think about it, one engine has made motorsports in the United States for nearly 50 years. The Offy was a great engine, as was the four-cam Ford. Who can forget the mighty Mopar hemis?

Any engine builder will tell you how important cylinder heads are to power and performance, so enthusiasts looking to spruce up their budget Chevy 305 small-block (SBC), or the larger and more popular ...