My 422 smallblock build

SSG_Karg said

I’ll have to look into that mod. If you happen to find a post or thread that explains it more please post a link here.


This engine will initially be put in my 72 Duster with 4 speed and 3.91 rear. I have a rough 70 Swinger that my son and I hope to build into a 70’s ProStock style race car that may eventually get this engine.

I know .0025 is on the tight side but it is within the .002-.007” spec. I will probably fiddle with the caps a bit to see if anything changes but I was pretty careful the first time to get it right. I tightened the rear main first and worked my way forward, skipping the #3, and worked it back and forth. Then held it forward and tightened the #3 cap.

Click to expand...

That .002-.007 is for dead stock stuff. If you start beating on it or racing it, the spec is .004-.008.

I'm hoping someone here who can use the search feature (I can never find anything) can direct you to the post where drilling the hole is outlined.

I've never done it. So I don't want to say exactly how they do it, or the hole sizing, because I don't want to tell you the wrong thing.

BTW, it might seem like we are picking the fly poop out of the pepper here, but if you are at .0025 and you get it to .0040, that's about a 70% INCREASE in clearance (rough math...if you went from .002 to .004 that would be a 100% increase in clearance).

Like I said, I'm a chicken. My wife will testify in court to that.