Ok, Changed heads, Cam, lifters, Got the Comp pushrod checker. Found Zero lash on several valve locations, reset checker to that length pushrod tightened rocker arm down all came down to 1 1/4 turns +or - I came up with 7.350 pushrod with .100 preload Just checking before I order pushrods
Thanks for looking

 

What lifters? .100" is a lot of preload.

 

Ya I'm a little confused here lash is what's used to determine the play between the rocker and the valve. Preload is how much the pushrod is pushing on the lifter, two very different things.

You want to find zero lash then check the length of the checker like you have done and then add whatever preload you want. It's a non adjustable hydraulic roller, there is no lash. With that said if you are using stock ls7 lifters I would shoot for .07 preload. You can run more and you can run less but that's a good medium. With that said 7.35 seems short unless you have head work or something else done

 

Stock rockers with trunion upgrade, GM hot cam, 243 heads, ls7 lifters, .051 head gasket. 6.800+ 9 X .050 .450 + .100 Preload 7.350 with this from zero lash to tight it took 1 1/4 turns on the trunion bolt.

The stock 7.400 pushrods were almost 2 complete turns zero lash to tight

 

You are using a 7.350" PR yes? If so 1.25 turns after zero lash is fine for LS7 lifters.

The difference in preload between a 7.350 and 7.400 PR should be just about 1 turn.

 

Yeah. If your sure your on base circle on the rocker your checking. Eoic. I snugged up the rocker bolt till the pr could spin but no up and down play. Then I tightened up the rocker till 22ft. Lbs. And had 1.25 turns. That is what you want. 1.25 to 1.50 turns to reach 22ft. Lbs. After valve lash.
Someone correct me if I'm wrong, but thats how I did mine shoebox.

 

Sounds good.

 

Got it, Thanks for help, push rods on the way.