Racinjason424

iTrader: (1)

Did GM ever switch over to LS7 Lifters in LS1 motors, or are they just direct replacements for the LS1 lifters now? I have a stock '04 LS1 from a C5 and I'm trying to determine what lifters were stock.

Reason I am asking, is when Patrick G spe'c out my cam, he gave me a formula for calculating the theotretical push-rod length, and he used 7.380 for stock push rod length and added the 2x the difference in the base circle. I had always heard 7.400 was stock length, but I know LS7's require short rods due to the cup sitting up higher.. I know Pat seems to know his stuff, so I thought maybe my '04 motor cam with the LS7 Lifters, hence the shorter push rods? Thanks, Jason.

gearhead1186

iTrader: (8)

to my knowledge only the gen 4 motors came with ls7 style lifters from the factory.

flintwrench69

iTrader: (11)

The LS7s are direct replacements for our LS1s.

Slash8915

iTrader: (21)

I'm running ls7 lifters no problem.

BIG_MIKE2005

iTrader: (116)

Yep, the LS7's are now the only stock replacement. You cant even buy original LS1 lifters anymore, GM will sell you the LS7's instead. I have had mine in my combo for 3yrs & about 50k miles, never had a issue & I drive mine daily.

Ethan[ws6]

iTrader: (13)

Just put a set of ls7 lifters in a t/a this weekend. No need to change pushrod length and as far as I've heard 7.400 is the stock length.

Racinjason424

iTrader: (1)

That's good to hear! I was expecting to have to go with shorter push rods, with the cup sitting up some .050/.060 higher..?? I will, of course, check with a p/r checker before final assembly. Wouldnt be the end of the world if I had to buy my fourth set of differentn lenght pushrods!