A question for the owners of this engine family (331/365/390/429). Just curious what kind of luck you've had with pulling them. I need to replace the gaskets, it's not terrible but a little annoying. I remember doing this on my 76 Cadillac 500 and most of the bolts snapped in the head. In the end, I had to pull the head off to fix the problem. Is this common with the 331 also. I've heard it is with the Cadillac 500.