Boosted_Silverado

iTrader: (3)

almost finished building my 408, just need to figure out what push rod length i need.

i have ls3 heads with ls9 cam.

picked up a push rod measuring tool and im not sure 100% on how to use it.

any info on how to measure for push rod length would be awesome.

Thanks guys.

Ferocity02

iTrader: (59)

If you got the tool that most of us do, it's pretty simple. Each full turn adds 0.050" of length. Lengthen the rod a little bit at a time, install the rod, install rocker, tighten rocker bolt. Repeat until the rocker is at zero lash right when the bolt is fully tight. Try to get within 1/4 turn accuracy. Then pull out the rod and count the tuns until the rod is fully short. Then do the math: Base length plus number of turns times 0.050" plus desired preload.

For example, lets say you counted 10.5 turns, base length is 6.8", and you want 0.075" preload.

6.8 + 10.5*0.050 + 0.075 = 7.400"

Do this for a couple other rockers to make sure you get the same results.

Boosted_Silverado

iTrader: (3)

Thanks for the info, ill figure out what i need tomorrow

Boosted_Silverado

iTrader: (3)

I finally got around to measuring my pushrods, I just want to confirm I did it correct.

I got 9 1/2 turns for zero lash, this length is 0.475?

Base length of the tool is 6.8 and I want 0.060 preload?

I ended up with 6.8 + 0.475 + 0.060 = 7.335?

let me know guys, Thanks!

Boosted_Silverado

iTrader: (3)

Anyone?

Ferocity02

iTrader: (59)

Yup that right! I'd go with 7.350" pushrods for a little more preload.

Boosted_Silverado

iTrader: (3)

Thanks