68 Camaro 350 with Edelbrock performer intake manifold. Getting a little oil seepage around center bolts. No problem for 400-500 miles then slight seepage starts again. Before resealing I always clean the bolts in solvent, clean the bolt holes & run a pipe thread reamer to be sure there's no residue/oil, etc, in the bolt holes. I use ARP thread sealer. Any suggestions for a better thread sealant? How about Permatex High Performance Sealant 56521?
Use Permatex non-hardening thread sealant (or Form-a-Gasket, old #2) - definitely oil resistant, I've always used it to seal head bolts, never failed me yet in 50 years of engine rebuilding. The only thing I dislike about it - don't get it on your hands or clothes (or anything else you don't want stained), it's a real pain to get off of you once it gets there. Great stuff -
Regards,
Steve