TTI 1 7/8 Headers hitting oil pan

You’re going to have to drop the pan or the header to fix that. I don’t think you’ll have any luck at all solving that without removing one or the other. You may try loosening the header up and seeing if you can move it a little on the studs, but that looks tight and you may not buy enough clearance that way. Shifting the engine in the mounts won’t help at all, both the pan and the header are bolted to the engine.

I’d dimple the header before I messed with the oil pan too. There are dyno tests out there showing that dimpling the headers has pretty much no effect on horsepower output. If you section the pan you’ll have to make sure it doesn’t mess with any of the baffles or trap doors that pan has. Not to mention if there’s oil in it now you’ll have to do a lot of cleaning to pull off the weld you’ll need.

I have a set of Doug’s headers on my 340 with a Milodon road race pan. The fit is definitely tight, but they cleared the pan ok. They’re 1 5/8” though.