07gsxr750

iTrader: (2)

ok so using the etp215 heads begin using a 8.1 pushrod, after 0.030 milled that leads to a 8.070 pushrod, now i am installing ls7 lifters and i see a lot of people running there pushrods .050 shorter with these lifters, so in the end that leaves me with a 8.020 pushrod, does all of this make sense

red83

iTrader: (64)

heres a start

https://ls1tech.com/forums/generation-iii-internal-engine/857802-ls7-vs-ls1-lifters-cup-depth-difference.html

vettenuts

iTrader: (4)

With that length pushrod, I would seriously consider a larger diameter. 3/8" if it fits, otherwise 11/32" outer diameter. This will help push the valve train harmonics up in RPM.

JPH

iTrader: (2)

agree, but also the "Valve Spring Frequency" has something to do with that to.