O'K i'll amend my statement
ops: , if you use studs instead of bolts and apply some sealent as others have mentioned they won't leak, BUT a lot of people don't use studs and they have a tendency to push out on the pan rails with stock type pans. Pans with thick/billet rails which are usually wider work much better with them. I just can't see spending $35.00 for a gasket for a stock type pan when i can spend $8.00 and have the same results. I've never ran a vacuum pump, only vacu-pan type evac system. Course a S/BlK doesn't have enough HP to turn a vacuum pump :lol:
Zip.