zx9rgreen

iTrader: (18)

Just finished up my buildup and the engine has some valvetrain noise. It has new lifters and .105" preload. That preload is with 7.4 length, should I swap the PRs for the 7.35? Would that quiet down the noise or make it worse?

My question is which is better and why..... 0.055" or 0.105" preload?

LS7 lifters

vettenuts

iTrader: (4)

I think the preload is fine and not the source of you noise. 7.375" is also available as an option. Trend has them on the shelf and they also make them for Comp, which are more money and harder to find.

zx9rgreen

iTrader: (18)

AH....Texas Speed doesn't list that length on their website. Thanks

vettenuts

iTrader: (4)

It is available. Or, you can call Trend pushrods as they have them and make them for a lot of vendors, including Comp. I needed 7.475" and couldn't find them anywhere, Trend had them to me in two days.

GMCtrk

iTrader: (23)

I got a question for you all. I've got an LQ9, with some 317 heads milled to 68cc (from 71) ready to go on, stock cam. I currently bought some 7.4" hardened pushrods. Will these work ok?

zx9rgreen

iTrader: (18)

I would think so.....

GMCtrk

iTrader: (23)

I don't know exactly how much was milled off the heads but Im guessing about .020" so the pushrods would effectively be 7.42". I've been told the stock pushrods are 7.395".