update

we have a old set of covers that we cut in half ,,,
we are loosing the valves till they peck a little then tighen till they stop and then giving them a 1/4 more

just a thought would weak springs cause this trouble ?

its possible for weak springs to cause a small "peck" at higher RPMs.... but also what octane fuel are you using?

what size cam dose it have in it? my truck did that untill i put a smaller cam in it

it was fine with the new cam this started all at once i think the lope is gone !!

i wounder how much of a lobe ware would there need to be to have peck like we are haveing you can see the rocker is going up and down today i am going to remove the coil wire and crank the motor and watch it compaire it to the others ,, if that would help

ok we check the lobe with one other cycl. and they are the same the best we can see we still are going to check the cycl pressure check,,,, i think it is coming from the spring it is louder there i use one of those doctor things to here it and it sounds like it is coming from the spring area more ???????????