flippincamaro

iTrader: (23)

Okay I have a ls1 5.7 with 5.3 heads milled .020 comp r lifters. F1 cam .591 .569 on a 112 the head gaskets are the stock ones from the local orielys fel-pro gaskets. Stock bottom end. Stock valves in the 5.3s but a good valve job done. Also i am running 7.4 comp pushrods. I think they might be to long cause if cruising for a few minutes at about 50mph i start to hear a really loud ticking coming from the engine but wheni stop for a few seconds and start going again it clears up for a lil bit. Has to be either the pushrods too long or rockers are messing up but they look fine or my new $200 comp lifters suck.thanks guys for all the help you have been giving me. Also my radiator is leaking but i have a new in the garage but it doesnt have the line for the top of the radiator for the head return line. Can i just cap that off at the heads but still have it crossover to each head so it still flows. I noticed my dads 5.3 truck doesnt have this from factory. What do you guys think of all this.
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ss rally red

iTrader: (8)

Depending on the base circle size of the cam different lenght pushrods might be in order.

flippincamaro

iTrader: (23)

I am not that great at this cam stuff what is the base size of the cam. Where would i find this info at? thanks

ss rally red

iTrader: (8)

First off check with your cam manufactor

flippincamaro

iTrader: (23)

I will ask the guy i bought it from if he knows it is a guy on here.

ATTI2D

iTrader: (1)

Pull the pushrods and check to see if you have a bent one

02Reaper

iTrader: (2)

If you have Comp R lifters like you state and 7.4" pushrods, you probably have way too much preload on those lifters from what comp states.

98 Silver Bullet

iTrader: (28)

I agree. I think with the stock set-up you get around .040-.060" of preload and that is with a stock pushrod which is 7.385". Most aftermarket cams have a .030" smaller base circle. If I did the math correctly and if you did not shim the rockers it calculates out that you are running around .035" of preload. Comp recommends .002-.004" of preload and this is checked on a warm engine.

flippincamaro

iTrader: (23)

Damn so i should need the 7.35 instead right? Or what size should i get? Dont have a legnth checker and dont know how to do it. What about the crossover tube for the heads? But if i have that much preload then wouldnt i need a much shorter pushrod instead thanks guys

02Reaper

iTrader: (2)

You really need a pushrod length checker and a dial indicator gauge to check your preload. If you have over 1/8 of a turn after zero lash to 22 ft/lbs I would say you have too much preload.

flippincamaro

iTrader: (23)

Great thanks guys i will check all this out