Originally Posted by
4 l-bodies
I've used both stainless and high strength metric bolts. Both with about equal results. There is one swingvalve bolt that penetrates the housing, if any are gonna snap off it always seems to be that one. Stainless obviously doesn't corrode like mild steel, but isn't anywhere near as hard as the other style of bolts. IMO, just make sure you use a good high temp antiseize on the bolts, and don't overtighten. Also run a clean sharp tap through the housing threads. Hopefully that was done on your new housing, but better to check it now, while turbo is on bench.
Also run a 18 X 1.5 tap through that o2 sensor bung. They always get lots a debris in the threads. Makes for changing o2 sensors a snap down the road.
Todd