Ok i just got finished replacing my head gaskets.......BUT, i dont know how to do the zero-lash thing and get everthing i running order!!!!!! can you guys help me out with a little know how?

 

Zero lash is where you can't turn the Push Rod any more. Then you go about a quarter to a half turn after that.
This is how you can adjust them with #1 and #6 TDC.

When at #1 TDC you can adjust the following valves:
Intake: 1, 2, 5, 7
Exhaust: 1, 3, 4, 8
Rotate the crank one revolution until the pointer is again at 12 o'clock. This will let you adjust the remainder of the valves. If you did #1 the previous time, you should be now at #6 TDC.
When at #6 TDC you can adjust the following valves:
Intake: 3, 4, 6, 8
Exhaust: 2, 5, 6, 7

 

ok thanks!!!!!!!!!Ok one more question........ I got 1.6's..... so how do i adjust those......i know there is a certain way to tighten them?????

 

^should be as stated above. Did you get self aligning? Rockers didn't come with instructions?

Don't make the mistake I did, take it to zero lash ONCE! Yeah it was my first time doing rockers every time I rotated the engine they were loose again, so I kept tightning, yeah I was a idiot, had no compression.

 

ya its my fist time doing umm........ so i other words, just repeat the process?!?!?!?........

 

Zero lash is where you can't spin the Pushrods. You go about a half-turn past that, and you will be good. I haven't had a problem with mine. Do you have Poly-locks?

 

Ya i have poly-locks!!!!!

 

K, you know how to set them properly....

 

LOL unfortunately no..........

 

Ok.. most of them are 5/8. What you do is tighten them down until the Pushrod stops turning. Then you go another half-turn. That is what you turn. Once they are there, you get a 3/16 Allen Key, and tighten the Allen Head screw in the center of the Poly Lock. That sets it in place.

 

alright sounds good!!!!

 

merv are you sure that's the correct procedure for zero lash? I thought it was till you feel slight resistance on the pushrod as your spinning it with your fingers and tightening the lock down?

 

That's how I did mine...

 

I could be wrong, I dont know, but that's how I did mine when I didnt have the engine running. Now I just set them with the engine running

 

By the book, some say a little resistance, some say when it stops spinning. The difference there may be a tenth of a turn, which won't hurt anything.

 

From the 1995 Camaro Firebird factory service manual.

Section 6A3B-40

C. Back off rocker arm nut until lash is felt in pushrod assembly. Then tighten rocker arm nut until all lash is removed. Zero lash can be felt by rotating pushrod assembly betwean thumb and forefinger until there is no free play but pushrod assembly rotates with slight resistance.

D. When all free play has been removed, tighten rocker arm nut ONE ADDITIONAL TURN (360 degrees).


Where did you guys get the half turn idea from? I ran factory unmodified lifters, pushrods, and rockers for two years without failures in my race motors adjusting them to the GM spec. Do you know something that GM doesn't? Is there an advantage to running half a turn over a full turn?


Thanks,

Daren

 

LOL...... so some say a half turn and some say a full turn.......?????????

 

No. Some say a half turn GM says a full turn!

My question is to why these guys say a half turn is good enough. Is there some kind of advantage?

 

I have always done half-turns, and we have had no problems.. When they are new, maybe they need more tension on them to break in.

 

But, where did you get the half turn from? Is there a performance or other advantage?