tateg2005

I have an aluminum L92 block(418), forged internals, VVT, comp 222/236 .566 .578 lift 114 lsa, 1 7/8 Kooks headers, .008 decked, .004 milled(11:1 compression), CNC heads, Comp 918 springs, 50 lb fast injectors, FAST 102 intake.

I am having a tremendous amount of valve-train (sewing machine) noise that can be heard from a major distance. Just put new trunion bearing rockers on, and I have the 7.4 pushrods in it. I just ordered a comp pushrod checker, but i'm just brainstorming on what it could be if my rod length isn't wrong. Do I need shorter rods? Or could it be lifters? I have the stock lifters. It runs great, and burns very little oil. I just can't live with the noise any longer, for it is my daily driver. I'd be extremely appreciative for any input. Thank you!!

SweetS10V8

iTrader: (4)

Our LS engines tend to be noisy, the FAST intake will make it a little louder as well. I think checking pushrod length would be smart.

Yould also look for some kind of engine cover that GM uses to reduce noise in these motors, Escalades/ Vortec MAX, etc. You can get them fairly cheap and it should help. Or in an extreme case even a cam with Comps new LXL exhaust lobes that is designed to reduce valvetrain noise. I know the cam you have now makes great power, Ive installed it in a few engines, so something similar in size.

tateg2005

Do any of the VVT cams have the LXL lobes? From what I saw there were only 4 or so cams that were for VVT application. It does make good power, and I kinda want to stay with the VVT and not do a delete. What should my lifter preload be? Wouldn't lowering it decrease noise some?

Jimbo1367

TATEG2005,
Before you purchased the Comp VVT cam, did you concider TSP's VVT cam?

tateg2005

I've been thinking about switching to the TSP VVT-3. Although it's an even higher lift of .620. Would it be a quieter cam due to something improved over the comp?

JLE58

Ls engines are noisy and the VVT engines are even more so.

tateg2005

Can anyone suggest what I should have my lifter preload at with what my mods are?

CAMSTER

iTrader: (10)

.030/.040 is fine.
About the noise, i would use a stethoscope, from harbor Freight, about $5. to locate it, i ones send a pair of lifters back to the manufacturer thinking they were noise, it turn out to be noise fuel injectors.