KingTA

recently bought a c5 with ported heads and cam, i cant remember the cam specs but it was a 590 something, anyway the car has a little valvetrain noise and still has stock rockers, should i replace them or what??

teke184

iTrader: (5)

all ls1s are noisy

many many guys run stock rockers up well past .600" lift

KingTA

also what length pushrods should i have?

Damian

iTrader: (89)

Noise from the valvetrain is normal with almost any aftermarket cam.

Pushrod is measure using the base circle of the cam and preload measurements. Thats kind of hard to tell you since you have zero knowledge about the cam in the car, nor has the base circle ever been measure.

Dyno the car. If there's no dips in the higher RPM's your valvetrain is probably fine. If it makes you feel any better, pull the valve covers off, loosen all the rockers, put #1 at TDC, and re torque them all via GM sequence.

Have fun

the_merv

iTrader: (88)

^^Is there a sequence? I always just put them on at 22ft/lbs no matter where the Engine was at, then rotated it and checked them all again.


I'm using stock Rockers, and my Cam is a .621/.612 Lift.

Damian

iTrader: (89)

Yes there is a sequence. TQ'ing them straight down the line tends to put preload all over the place.

Do a search. The GM TQ sequence is all over the internet. I am too lazy to type it all out lol

smokinponcho73

iTrader: (6)

Ya I'm pretty sure my chiltons just said 22 on all of them

the_merv

iTrader: (88)

I'm sure it can be done with the Cylinders at TDC, and just rotating it in the Firing Order.

red83

iTrader: (64)

i had a .649 lift cam w/ stock rockers on my turbo car

Shawn MacAnanny

iTrader: (12)

I have stock rockers on a .651 cam no problems so far.

Sharpe

iTrader: (7)

.598 and 123,000 here.

cabech984

iTrader: (11)

From what I gather, the only major concern in using stock rockers is more valve guide wear than if a smaller cam was used.

Idk for sure though, Im gonna try it out lol.