Big Inch Smallblock

B3422w5 said
Never seen a W5 head go remotely close to 355. For one thing, they flat aren’t big enough.
I can say this for sure, even a good W5 head is more than used up with a serious effort 4 inch crank deal. You need go no longer stroke on anything like that. Those heads were designed for stock stroke 340-360 mills. Not 400+ inch stuff.

They will go that high. I was at 340 on mine, but it took a **** ton of work.

I think (THINK) I could get close to 400 out of them, but by the time you did all the work you might as well try and find some W7’s because that’s what you’d have.