Swirl Port heads

302's and 714's are identical. I have both sets, cant find any difference between the two other than the 714's have heavier nail head exhaust valves, rotators on the exhaust valves, and the heads are factory machined for positive valve stem seals. They also "seem" to be heavier than the 302's, like it just has more meat in the casting, but that hasnt been confirmed. Have both tested for cracks, and run the best ones. Six in one hand, half dozen in the other.

Oh, and NEVER trust the factory "rated" cc's of any head. Most are almost always several cc's larger than they are spec'd out to be. Most 302's are usually between 62-64 cc's uncut.