pwrtrip75

iTrader: (8)

Ok, I put together a iron 6.0L and have stock unmilled 317 heads on it, a stock 02 Z06 cam, stock rockers, 7.400 pushrods, and some other stock metal MLS gaskets i had laying around. Valve train was kinda noisy upon fire up... and when it warms up i get some noise.
Its cold now and I can get .013 feeler gauge under a couple easily. I know when it heats up that number will go up, probably to around .018-.020 due to thermal expansion.

I would think it should be close to zero, or is what im seeing normal?

Sales2@Texas-speed

iTrader: (5)

These engines' lifters actually have preload (opposite of lash for the newbies out there reading) on them out of the box. It can vary by quite a bit, but you typically see them with anywhere from .050-.100" or so of preload from the factory.

pwrtrip75

iTrader: (8)

So...whats that mean? If its preloaded it shouldnt have any slack in it like it does... right?

frito1

iTrader: (12)

When I saw the title, I was expecting someone that had less than 5 posts to be asking about lash in an LS motor.

correct

pwrtrip75

iTrader: (8)

Ok then, thats what I though... I just need to figure why they are loose.....which is weird. Hense the reason I ask.

Sales2@Texas-speed

iTrader: (5)

How did you go about tightening them down? You need to have the lifter on the cam's base circle when you tighten them down. And yes, there should be no slack, AKA lash. Rather, these engines have the lifter cups loaded or pressed down slightly.

Whistler

iTrader: (46)

If the lifters are bled down, you will be able to easily lift the tip of the rocker giving the impression of "lash" All you're doing is compressing the plunger inside the lifter.