Torque specs

[Compufreek]

What are the correct torque specs for stamped rockers on a 3100. I just rebuilt my top end and I am gettting alot of chatter. I think the Haynes book says 18ft\lbs.

[bszopi]

http://www.60degreev6.com/index.php?p=pages&pid=36

And yes, that is correct. All of those specs are from a GM Service Manual.

[Compufreek]

Sorry man I check the site don't know how I missed that!! LOL Then what could be causing the chatter?

[bszopi]

What all did you do to the top-end? If you took out the lifters, or put new ones in, it could be them just getting back up to pressure. I'm sure there are a few other things it could be. Just lemme know what all you did...

[Compufreek]

I basically just did a gasket kit down to the head gaskets because my intake gasket was leaking horrible. I left the lifters alone and took care to be careful with torque specs and tightening patterns. The only performance mod that I did is shave the heads .015 to get a slight CR incease. Now the chatter is definately coming from the valve train but it is all of them not just one or two so I am lost as to what the prob can be.

[GPXSS]

Its possible that .015 shave threw off the lifter preload. Define chatter, is it a loud tick that varies with Engine RPM?

[Compufreek]

Yeah you can hear clacking almost like a sewing machine when it is running but it is all the cylinders and it speeds up as the engine revs.

[geoffinbc]

The pushrods are different lengths for exhaust and intake.. Do you have them all correct?

[Compufreek]

What are the pushrod lengths? I am pulling the front valve cover tonight to check because it has come down to that or maybe oil delivery.

[bszopi]

http://www.60degreev6.com/TSB/TSB09-3x00.html

Yeah, it's all on the site... you just have to know where to look.

[Compufreek]

LOL, Ok so I'm blind! Thank's man! I hope it is something this simple, it may not be good but certainly easy to fix. Some one on w-body.com forum said to maybe adjust the valve springs...I can't see how that would be possible, there is only a spring with a retainer and the valve.

[Compufreek]

Ok so I pulled the front valve cover and I took a look at the rockers valves and pushrods. they all seem to be fine and I now think the noise is coming from maybe deeper. Could a bad lifter make the engine sound like a sewing machine, LOL. That would really suck after just throwing a gasket kit in!!