YT 6645 rockers & LS7 lifters, what's the preload range?
#1
YT 6645 rockers & LS7 lifters, what's the preload range?
I come up with 5/8 to 7/8 turn of preload with using the supplied YT rocker shims, torqued to 22ft.lbs.. Do I need to use a different amount of preload with the LS7 lifters, or am I good-to-go already?
Thanks!
Thanks!
#5
TECH Senior Member
iTrader: (4)
The YT shims are not used to set preload, they are used to set geomtery (wipe pattern). You need to verify the wipe pattern first, then determine the correct pushrod length. If you are following LS1howto.com, it is wrong with the methods used for installation. Here is how you set them up: Link
#7
10 Second Club
iTrader: (30)
Pushrod length determines preload not shim height as vettenuts said. Figure out the wipe pattern first using or not using the shims. FWIW I had 7.400 pushrods and .100 preload on my ls7 lifters and it was loud!! I changed to 7.350s and .050 preload and it was almost as quiet as stock.