Stampede4ever

Ok, here is the deal, I have an LQ4, went from 317 heads to stock 799 heads, new LS7 Lifters, and a Elgine cam. The base circle of the stock cam is 1.551, and the new cam is 1.467.
Will 7.4 length push rods be correct?

Thanks.

Camaroga

Buy a pushrod length checker and don't guess.

Stampede4ever

Ok, I bought a gauge, checked both sides, one cylinder per side. Had 10 turns out, 0.500" plus 6.800 plus 0.050" pre-load, equals 7.350" stock push rod length, was not expecting that!!!
Does this sound correct?

Stampede.

Camaroga

Are you running aftermarket rocker arms?

Stampede4ever

Stock rocker arms, Pac 1218 springs, elgin cam.

Camaroga

I know some roller rockers sit closer to the head, requiring a shorter pushrod. We can rule that out.

Did you check it doing the EO/IC method?

Stampede4ever

I will double check again, to make sure. I'm concerned on the numbers, don't make since.

Thanks.

Stampede4ever

Well, I tripled checked it, comes out the same every time.

Stampede.

Camaroga

I find it a little strange as well, but 7.350 it is, then. Can't argue with the facts.

RB04Av

That's why we measure, instead of "assuming" or even "guessing".

98CayenneT/A

I would run more than .050" preload on Ls7 lifters

Stampede4ever

How much would or should run? I might be a little more then 0.05" but not much.
Don't push rods only come in 0.05" increments?


Stampede.

Stampede4ever

Yep, I was going to make reply about that.

Stampede.

98CayenneT/A

if you measured correctly I would get 7.375.
With Ls7 lifters they seem to have the least amount of valve train noise at around .075" preload

Stampede4ever

Are the LS7 lifters the same height of LQ4/9 lifters?

Thanks.

99'BlackBird

iTrader: (1)

That is very helpful since I just purchased some LS7 lifters! Thanks for the tip!