[CWizard]

I'm not a bolting expert, but here are some suggestions for you. 1. Tighten the bolts hand tight, sufficient that it doesn't leak. If you're going into aluminum, take care not to overtighten and strip the threads. 2. Check with the intake manufacturer and see what they recommend. 3: My 351W t-stat housing stays on quite nicely with about 15 ft-lbs (aluminum intake).