Z28harcor

Long story short. I have a cheap stroker with stock heads and IDE the spring.. Has 1.6 rockers guildplates and stock roller lifters what's the best valve adjust for that cam... I have 1/2 turn past 0 lash

leadfoot4

iTrader: (1)

Sounds reasonable to me....

96capricemgr

iTrader: (1)

people fixate on how much preload but usually the problems are in where they start adding preload from. "zero lash" is hard for a lot of folks to find.

That said 1/2 seems reasonable, some guys will go further so the plunger can't compress much and soak up lift. Others swear you have to have barely any preload which seems to mask underrated valvesprings. I have tried everything from 1/8-5/8 and couldn't really tell a difference so I usually stick with about 1/2.

BALLSS

agree it is finding the "zero lash" part people screw up easily.

assuming lifters are pumped up zero is when there is no up/down movement...NOT when you feel resistance "turning" the PR

I go 1/2 turn

Z28harcor

Thanks for the replys guys..last time I set the rockers is when I primed the engine on the stand and about 300 miles go.. Seems to run a little rough untill about 3k.. I checked everything. So the rockers are next.. And should I let the car run for a few min then adjust them?? Not cold obviously. And I use the up and down technique not spin.

96capricemgr

iTrader: (1)

with polylocks you can lightly spin the nut down with your fingers till it just touches, verify the pushrod is seated and wont move up and down and call that zero.

great421

iTrader: (1)

My 0.02 -

I've adjusted 3/4 of a turn past zero and my step father (an ASE certified Master Mechanic) told me that was too loose; he says 1 full turn.

So, last year when we replaced one blown head gasket, we used the one full turn method, then fired it up - the opposite bank (adjusted at 3/4 of a turn) rattled - we pulled the valve cover and re-adjusted that side to one full turn and the noise disappeared.

(Food for Thought.)

: )

leadfoot4

iTrader: (1)

What kind of lifters are you running? Did you adjust the preload with the engine running or off? If running, did you do an initial adjustment, let it run up to operating temperature, then adjust them again? There are a number of variables that can effect this often discussed adjustment procedure.

For the record, I currently have OE lifters in my '96 Z-28. They were adjusted to 3/4 turn of preload, with the engine running, and fully up to operating temperature.....and they're quiet. In the past, I had a set of the Comp Cams "limited travel" lifters, and they were supposed to be set at 1/8 turn of preload. I tried setting them several times, between 1/8-1/4 turn of preload, engine running, up to temp, but they were always noisy. After a while, I took them out and put the OE parts back in. Since I don't race the car, who needs a high RPM capable valvetrain?


Anybody want to buy a set of lifters?

SS RRR

iTrader: (2)

As long as lash is found while lifter is on the base circle of the cam 1/2 past is just fine unless the lifter specifies otherwise.