[Cdnone1]

Thanks to all who have offered great advise. Here is where I am at so far. The right side heat exchanger is off. Two of the studs came out clean from the head on one cylinder the other 4 studs broke of clean at the flange. I am going from thick flanges to thin so I've got 2 clean holes I can insert 2 new studs into. I have got 4 studs with enough thread to cover my new (74) heat exhangers.
Should I try and remove the other 4 studs but double nutting them heat and PB blaster or just install the heat exc and spacers and bolt it back together.
I can't thank everyone enough for the advise.

Thanks again
steve