how to use pushrod length checker?
#1
how to use pushrod length checker?
I am thinking about buying a pushrod length checker from summit to be sure everything is just right.
decked shortblock (unsure of deck thickness removed/ surely not much)
afr 205 heads (hopefully someone gets them in soon) unmilled in stock form
crane or comp (NON COMP R'S) lifters
I figure a stock length 7.40 will be right but want to know how to check with the tool?
I am guessing it installs like a pushrod, install rocker arm, tighten rocker to 22ftlbs then remove and see the length?
thanks
decked shortblock (unsure of deck thickness removed/ surely not much)
afr 205 heads (hopefully someone gets them in soon) unmilled in stock form
crane or comp (NON COMP R'S) lifters
I figure a stock length 7.40 will be right but want to know how to check with the tool?
I am guessing it installs like a pushrod, install rocker arm, tighten rocker to 22ftlbs then remove and see the length?
thanks
#4
Mark the top of your valve with a black, non permanent marker. stay within the 7.3"
to 7.4" range as a start point. roll the motor over until that valve fully opens and fully cycles closed then observe the mark. It should be dead center of the valve, if not remark the valve, retorque and adjust the adjustable pushrod length until you find the middle "Rub" mark.
Thats the length you'll need.
to 7.4" range as a start point. roll the motor over until that valve fully opens and fully cycles closed then observe the mark. It should be dead center of the valve, if not remark the valve, retorque and adjust the adjustable pushrod length until you find the middle "Rub" mark.
Thats the length you'll need.
#5
Originally Posted by rangersix
Mark the top of your valve with a black, non permanent marker. stay within the 7.3"
to 7.4" range as a start point. roll the motor over until that valve fully opens and fully cycles closed then observe the mark. It should be dead center of the valve, if not remark the valve, retorque and adjust the adjustable pushrod length until you find the middle "Rub" mark.
Thats the length you'll need.
to 7.4" range as a start point. roll the motor over until that valve fully opens and fully cycles closed then observe the mark. It should be dead center of the valve, if not remark the valve, retorque and adjust the adjustable pushrod length until you find the middle "Rub" mark.
Thats the length you'll need.
#6
One other thing, this is the reason so many LS1's have lifter noises when the go to a bigger cam, they can not get the preload correct. Even with different pushrod lengths, the best you can hope for is to get it close, because every valve willl be slightly different and the pushrods only come in selected lengths (unless you get a set custom made). That said though, a stock hydraulic lifter can compensate for quite a lot of variance. A type R lifter can not and that is why it is reccomended that you switch to an adjustable valvetrain when using that type of lifter.
#7
You can buy a package of .015 and .030 shims from comp or crane. Put them under the rockers that have too much preload (installed under the rail). I bought an adjustable one from thunder racing over a year ago. I used that to figure out the ballpark length that I was after. Then I used shims to adjust the individual rockers to get proper lifter preload.