sjsingle1

iTrader: (1)

got some 6504 lifters ( thanks Straub ! ) but cant find any info if I can keep the stock length pushrods or not....anybody with experience ???

G Atsma

Straub should be able to answer that....

sjsingle1

iTrader: (1)

emailed them....no response yet....

Darth_V8r

iTrader: (4)

Best thing to do is get a length checker and measure.

G Atsma

^^^ the DIY solution, especially when it's after Straub's closing time...

sjsingle1

iTrader: (1)

I was mainly wondering if someone has already used these and did the measuring thing....I did not know that the 6504 replaced the 5312....so all new to me

vettenuts

iTrader: (4)

I have an older set of Morel lifters, don't know part number but they were taller and required a shorter pushrod for that reason. Mine were designed for higher lift to prevent oiling issues that can occur with the stock GM lifters.

I would measure.

nine8ss

iTrader: (5)

Actual measurement is always better than someones educated guess.

sjsingle1

iTrader: (1)

to measure I need preload length ...called straub.....its .050 - .060 for these ......waiting on my comp cam push rod checker to come in now

00pooterSS

iTrader: (40)

Knowing sj the little I do i'm sure he planned to measure all along, I'm sure he just wanted some sort of answer while waiting for emails and the length checker.

I'm curious what you find man, post up when you figure it out.

sjsingle1

iTrader: (1)

finally got it measured...boy is measuring time consuming......with preload added I need a 7.415.....but you cant get that size.... so its stock 7.4 for me

vettenuts

iTrader: (4)

How much preload with the 7.4? I ran mine at 0.030 originally and they were noisy on cold start. At 0.050 they are real quiet.

sjsingle1

iTrader: (1)

since they told me 50 - 60 preload....i split it to 55

i went and got some comp cams 7638-16 from summit....their new store is 30 mins from me ! ( have to save up for those nice taper ones like you got nuts )

measured them all and 15 of them are 7.410 to 7.415....one odd ball at 7.420

engine wont be running til next summer

vettenuts

iTrader: (4)

If you are measuring with a caliper, they will be longer than the 7.400" because the stamped length is the pushrod gauge length and you are measuring overall length.

sjsingle1

iTrader: (1)

I knew advertised length was not the same as measured length......but i thought advertised length was shorter ....not longer

so i really did get close to my 7.415 that i measured and need....off to summit to exchange that odd ball size one

better to have to short than to long ?