Which rockers with comp "R" lifters
There is a really good write up on how to install Yella Terra rockers on ls1howto.com. In short (from what I gather anyway) is get both valves closed (zero lash) then tighten the rocker bolt down by hand as far as you can. Then get your torque wrench and set it too 22 ft pounds. Count how many revolutions u get till the bolt is torqued down. Each 1/4 turn is supposed to equate to about .010 to .012 in preload on the lifter. When I did mine I came up just short of a 1/4 turn so I am guessing I am somewhere between .006 .008 preload - hopefully that will be good enough. Like I said check out ls1howto.com there is alot of very good info on that site. Hope that helps
oh and if your not using the Yella Terra rockers I am sure you would check the preload using the stock rockers (or any non adjustable bolt down rocker) the same way. That was probally obvious but I figured Id throw it in in case anyone was confused 
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Verdad Gallardo well..there is only one problem with your method..since you are doing it this way..your rockers are no longer torqed to spec..with means they could back off, causing problems and a lot of headaches
Originally Posted by spectacle solutions
well..there is only one problem with your method..since you are doing it this way..your rockers are no longer torqed to spec..with means they could back off, causing problems and a lot of headaches
TECH Apprentice
Joined: Dec 2001
Posts: 340
Likes: 0
From: Fort Worth TX
so if I set the piston at tdc on the combustion stroke... and put plasti gauge between the rocker and pedistal... then tighten by hand untill the rocker makes contact to the pushrod and valve... remove rocker.. measure plasti gauge... that would be the preload? Then make a shim that would make the preload .002"-.004" for the comp r's? Does that make sense?
You guys are funny. Arguing about this ****. You have non-adjustable rockers. You can only do so well with this. I did not use any special tools. I made different shims from sheetmetal and tried 3 of them out. Got it just rigt. Could tell by sound a feel. Revs tp 7500 no problem.
TECH Apprentice
Joined: Dec 2001
Posts: 340
Likes: 0
From: Fort Worth TX
Well, tonight at work I made some strips out of 0.050 shim stock... the cool thing about this **** is it peels away like foil and I can make the shim as thin as needed. Hopefully I can use plasti gauge or a feeler gauge to determine the required thickness.
Originally Posted by LS171Malibu
Well, tonight at work I made some strips out of 0.050 shim stock... the cool thing about this **** is it peels away like foil and I can make the shim as thin as needed. Hopefully I can use plasti gauge or a feeler gauge to determine the required thickness.
Dan