360 4 bolt mains

I agree with Mark, not a good idea in a regular passenger car block. This is one of those Chevy things, the Chevys have them so we should too. It's BS. I'm making nearly 600 HP with a nonfilled late model stock stroke 360 block with just main studs. If you absolutely insist on four bolt mains then buy an MP R3 block, I think the 340 replacement block has 4 bolt mains as well (not sure though) but if it doesn't I'm sure it's got the thick webbing to use them.