76' chevy camaro

[brutisrazutis]

i have a 76 maro with a 350. i have a set of edelbrock aluminum heads a weiand 142 cid blower with a holly 750 vaccume seconday advance carb. well i adjusted my roller rockers by backing them off till i hear them knock then tighten them till the knocking stops. then a quarter turn more. and tighten down the allen head lock screw. well i drive it around and all is good, but as soon as i give er hell down the street and then back out of it then everytime i accelerate after that my valves start knocking again. so i re adjusted twice more, and i felt good and then sure enough they started knocking again. what is causing this and how do i fix it? ummm its usually just the #4 intake and the #6 exhaust valve knocking. im guessing its just the roller rocker lock nuts are bad on those two valves. would rocker arm girdles fix this problem? any help would be greatly appreciated.

thank you,

brutis

[StrokedOne]

I would say if you think it is the nuts, move them to another lifter and see if it follows or, to be safe go buy a few new ones. Might keep you from having to take your covers off one more time..lol... I doubt it is the nuts backing off, especially if they have a locking allen head.
It also might be the lifters are bleeding down and possible going bad... but that does not explain why it does it only when you "get on it". After you adjust the lifters and let it set... then fire it up about 30 minutes later.. does it "tap" then. I recently had a lifter issues myself.. (if you do have one or two going bad, catch it before you tear the cam up) You can see what I'm talking about if you read my 383 stumble/miss post.. It's going to cost me..

[silicon212]

Another possibility is a rocker stud pulling out of the head.