[blue71ta]

I've got a '71 T/A with the 455 HO engine. I'm running a Comp Cams Xtreme energy cam with matching lifters, springs, retainers, locks & pushrods.

I'm using the big block chevy style rocker studs to make the valvetrain adjustable.

Looking for opinions on what to set the valve lash at. Zero plus 1/4 turn, 1/2 turn, 3/4 or other? What do you guys usually do on an adjustable valvetrain?

[Held for Ransom]

I don't remember... 1/2 or 1 turn.

[Kenth]

If the plunger in the lifter has the std 1/8" travel i would use 1 full turn from zero.
That would place the plunger about halfway into the lifter.

[78w72]

What did the instructions for the lifters say to adjust them at? Different lifters can have different adjustment amounts... best to read & follow what comp says to adjust them to or call comps tech line.

[skunkwerks]

Make sure to Soak the lifters overnight in oil.
Follow the firing order.
Turn the push rod with fingertips until you feel the drag change.
1/2 turn and that should be good.
Loser the better without clatter.

[Norwood]

Originally Posted by skunkwerks

Make sure to Soak the lifters overnight in oil.
Follow the firing order.
Turn the push rod with fingertips until you feel the drag change.
1/2 turn and that should be good.
Loser the better without clatter.

I could not of said it better.

[blue71ta]

Thanks for the input. I did reach out to Comp Cams also, but am waiting on a reply. Figured the Pontiac specialists here would know what's up.

[78w72]

Originally Posted by blue71ta

Thanks for the input. I did reach out to Comp Cams also, but am waiting on a reply. Figured the Pontiac specialists here would know what's up.

Better to call their tech line, emails can take a lot longer. Or if you have it, look at the instructions that came with the lifters.

Im sure 1/2 past zero lash is a good ballpark or might be the correct setting... but different lifters can & do have different adjustment specs, even the same brand can have different adjustment based on the type of lifter.

[poncho-mike]

I always used zero lash plus 1/2 turn.

Same procedure slunkwerks noted in the earlier post.