Mine are coated to,I just cranked the idle screws out a quarter of an inch before the last drive.I dont think it was running to lean, there are 2 other possibilities,1-I just finished installing hyd/bst and had it up in the front while running,thats when the oil leak started I guess it pooled in the back and then started leaking, maybe burnt on the gasket,or 2-the most likely I had a small exhaust leak that started about halfway through the last ride,if it was going up towards the v/c's that cuolda dunit.I have to pop the exhaust off to retorque the heads I might try the copper gaskets and some different [better] bolts.The only thing I could find that worked on the back two holes was a allen head. Anyone know of some real good bolts for these 1 7/8headers I'm all ears.