These were bolts and I used Right Stuff on the threads, the 1 chamber had little white deposits around the chamber not sure if it was water? the rest looked good, Curtis I sent the Patriot heads to Al Dicksen (rhd) he called & said the valves were terrible as were the chambers & seats!! so when I get them back (new valves & 2.30 intakes) he said I should pickup at least 3 tenths which would get me in the 8.90's hope he is right!, Doug