okay, just recently i ran a compression check and found my 3rd cylinder had only 25psi then dumped out immediately. dropped some 10w40 in the cylinder and checked again and compression still dumped at 25 so its not the rings. needless to say my valves come in tomorrow and getting them installed properly from what ive heard is the difficult part. is their any laping process that i should take along with grinding compound to get the the 2 new exhaust valves to seat correctly?