Hey guys,

Just a quick one here. Anyone got a calculator for pushrod length?

Perhaps someone can just answer my question straight up. I'm going to be installing a cam with specs of:

224/228 .581/.588 on a 113

Now.. do I use stock length 7.4" pushrods or do I go longer/shorter? Usually in the old motors I've put together you go with a shorter rod since the lift has increased in order to maintain proper valvetrain geometry...

Is my PVC gonna be okay? (no work done to heads at all/stock gaskets etc.)

Any advice?

 

I'm pretty sure cam base circle and rockers will determine p/r length. Someone correct me if I'm wrong.

 

Cam base circle determines pushrod length along with Your heads.(if they have been milled) 7.4 is for an aftermarker cam and stock or unmilled ls1 heads.

 

I would use 7.425 Comp Cam p-rods. Available at Thunder Racing
While 7.40's will work, you valvetrain will be noticeably noisier.
7.425's quiet things down a lot and get you closer to original preload on lifters.

 

Gotcha. Right on. Is that because as was mentioned the base circle change necessitates this? I always used to associate extra lift needing a shorter rod. I'm betting I was wrong!