I had a valve job done and my specs are 75, 45, and 30. It was checked on a flowbench and it was good, there was no leak. When we put the motor back together and went to start it up it wouldnt. When it finally did it was missfiring and the compression in the #2 and 3 cylinder were way way low. We did a leak down test and it passes ok. Well i took the head off thinking it was bent valves, but there were no dings or marks at all on the pistons. Valves checked out ok too. #2 and 3 pistons were clean as hell compared to 1 and 4. I am stumped. I was wondering if you guys had any ideas? Also what should the valve lash be with this valve job? I set it to spec with the intake 6 and exhaust 7. Any help is appreciated, thanks