im putting a torquer v2 in my ls1 and i want to make sure i use the correct pushrod lenght for my set up. Im confused about checking pushrod length, I have a pushrod checker and i know to add your preload to your length and that should come up with the correct length. Im dont understand what preload i should add,nome people say they have .050, .060, .075 etc. how do they know?
Thanks for the help

 

I bought one of those too, never used it.

Here's some copy\paste


From Shane at Thunder Racing.

The TDC method is NOT always accurate. Try the EO/IC method to check
pushrod length. I have posted
directions on this forum numerous times... Here it is again:

FWIW, EVERY cam install I have done using the LS7 lifter with a cam
with greater than .600" lift (read smaller base circle) AND stock heads
w/GM MLS gaskets has taken 7.425" pushrods for ~.050"-.060" preload.
We measure lifter preload on each and every cam install we do. I have
never had a lifter failure nor do we end up with the dreaded "sewing
machine" noise.

Its very simple, If you change ANY of the following:
valve sizes, valve job, head milling, thinner/thicker head gaskets,
decked block, cam with an altered base circle, etc... YOU MUST CHECK
FOR PROPER PUSHROD LENGTH.

I have helped countless numbers of individuals with this process over
the phone, via email, and PM's. I've posted the process on at least 3
occasions.

Here it is again in a nutshell:

1. Using the EO/IC method, get the lifter to the base circle of the
cam.
2. Using a known length pushrod (7.400" is a good start with stock
rockers) run the rocker arm bolt down to zero lash. This is easily
done with your fingers "wiggling" the rocker, the point at which the
"slack" is just gone is zero lash.
3. Set your torque wrench to 22 lb./ft. Tighten the rocker to full
torque and count the number of turns it takes to get there. 1 full
turn wtih a stock 8mm X 1.25 bolt is ~.047" preload as measured at
the pushrod/rocker interface.
4. I normally shoot for 1 1/4 to 1 3/4 turns with stock type lifters
like Comp 850's, LS1, LS7 etc.

For an example, if you use a 7.400" pushrod and come up with 3/4 of a
turn, you will need at least .025" longer pushrod to get into range.
If you end up with 2 1/4 turns, you will need one .025" shorter...

I might not know everything but I will tell you that this method has
worked for me year after year cam swap after cam swap. We average 3
cam swaps a week here so you can do the math.

If you are not familiar with the EO/IC method for determining valve
events in a 4 stroke engine, its very simple:
For a given cylinder as the Exhaust valve is Opening, the intake lift
will be on the base circle of the cam and lash/preload should be
checked for that intake valve.
For a given cylinder as the Intake valve is Closing, the exhaust lifter
will be on the base circle of the cam and lash/preload should be
checked for that exhaust valve.

THIS METHOD ALWAYS WORKS!!!

Check it using the above method and see where you are.