[Woodz428]

I agree with Mr. Mustang. I've owned several '69- '70 351W blocks and it looks no different. Actually, I'm not sure it is as good, the early blocks I had were cast for 4bolt mains, you could see it in the block castings. I suppose they intended to make a 4 bolt block and never did or they could have used the Boss 302 bottom molds. While I'm more than aware of the Mexican 302 blocks (which were more like the Hi-Po 289,not the Boss 302) this is the first I've heard of these "rare" blocks. I guess that does make them rare. Just because they are made in mexico doesn't certify they are heavier, not all the 302 blocks from there were.