Is there somewhere I can research fixing the flange? I just switched to an M1 on my magnum motor since I'm adding a Procharger and it's the only option for magnum single plane. Didn't know about the thermoquad flange until I got it in the mail
I just weld up the plenum and machine it back to square. Some guys make up a plate that goes in there. RF posted who it was. It's a damn nice way to fix them.
Either way, fixing the top is a big help. The last one I tested was ~12-15 HP better than a stock one.