thanks for all the help!

when i adjust the lifters (with the engine running) on the 2,4,6,8 cyl i can hear the rocker tapping real good on cyl 2,4 but when i adjust the 6,8 you can barely if at all hear the tapping sound. and i loosened it up practally all the way off. i rechecked the compression on that side and there was very little difference. i pulled the push rods to see if they were bent and they looked good. also i noticed that the 2,4 cyl you can really see a difference in the valve spring compressing compared to the 4,8 cyl where they werent really compressing forcefully. also how do i tell which is the exhaust valve and intake valve ? i will try to adjust them the manual way. thanks again!!