[Jack21]

347, I'm not saying the early 351W heads won't work on your 302. 30 years ago, that was the only option we had. And as Rich C. pointed out, it's almost more of a hassle than it's worth.

And as Rich C. learned, when you mill the heads, you also need the intake manifold surface on the heads milled the same amount, or the intake ports won't line up. And wind up spending more money on machine work than you would have by just replacing the heads with the right aftermarket ones and bolted them on.

Frankly, if it weren't for the availability of aftermarket parts, I wouldn't have built a Ford engine at all. My 351W has only the block, crank, and front timing cover actually made by Ford from the original motor.