[Jim Vander Wal]

I ran SCE #4736 copper gaskets for my AFR 225 heads. Also used studs, nuts and washers. No idea on torque, I just tightened 'em up. I used the 3" bolt spacing, wouldn't use the 2" spacing unless it was the only option.

I didn't have any real issues at the head but the header to sidepipe square flange and gaskets were problematic. Ultimately built soft copper gaskets for these flanges.

I'd guess that due to gravity pulling the header & exhaust system down the flanges will be tighter at the bottom and looser at the top. The bottom of the flange becomes the pivot point.

If you are going to pull the headers and have them machined flat you may need to remove more metal than expected. Header flanges and "flat" are often a problem.

Jim SPO 1855 & 2584