Hey guys I'm in the middle of installing a set of AI 243 heads they were milled .030. I'm also installing LS7 lifters and the car already has a gm hot cam. I just need a confirmation in my pushrod measurements. With the comp cams tool I measure out 8.5 turns 8.5x.050=.425+6.8=7.225 if I add in .075 for preload I get a 7.300 pushrod. Smallest off the shelf I found was 7.325 which would give me .100 preload. Is this to much? Now to check my measurements I used the counting of turns to reach 22ftlbs. With my tool set at 7.325 length, from zero lash to 22ftlbs I came up with 1 3/4 turns which is what's recommended. So is 7.325 where I want to be?

 

Your calculations look correct. I don't run those lifters so I cannot speak to that preload level other than to say others on this board run that much.

 

Trand pushrods will have them in stock and make the pushrods for most other companies including Comp.

 

http://www.briantooleyracing.com/pushrods/

BTR has pushrods less than 7.300

 

I have comp 7.3's with less then 20,000 miles $60 shipped... Let me know

 

Thanks for the replies guys I guess I should have looked a little better first. So should I get 7.300 or 7.325?

 

Seen this and really want to know how you got that formula? New to this and really eager to learn all these formulas so I don't rely on keyboard ninjas in forums.

 

https://ls1tech.com/forums/12843999-post7.html

https://ls1tech.com/forums/12529924-post3.html

https://ls1tech.com/forums/generatio...s-measure.html

 

Thanks for sharing "darkman" and for the record I went with 7.300 comp pushrods and they worked out perfect

 

Thanks man!