[Modena]

Thanks Mike, that was what I had planned, welding while on the heads, although I'm going to MIG them, there is a bit of a gap around the pipe and flange port and I'm more comfortable MIGging it than TIGging up that gap.

The 1 & 3/4 pipe is still bigger than the exhaust port, so matching is not a problem.

It was actually very handy having those spare heads, as it allowed me to mock up both in the car (also have a dummy block in there) and also mock up on the LS3 on the engine stand in relative comfort, this made it a lot easier because the body is on.