Pretty Will

Im looking at summit heads http://store.summitracing.com/partde...art=SUM-152123

and this cam
http://store.summitracing.com/partde...rt=LUN-60103LK

Not sure what length pushrods I need.

Vette79C3

Stock pushrod length for a 79 was 7.800. I recommend purchasing a pushrod checker tool and then measure after installation of heads, lifters and rockers to be sure.

Pretty Will

It si not an original engine it is a gm performance replacement.

This is it
http://store.summitracing.com/partde...3&autoview=sku

Vette79C3

Have you asked Summit for assistance?

Pretty Will

Yea i just got off the phone with the guy and he said that stock length should work, thats the problem I have no idea about the lengths.

Edzred72

With a hardened, .080 wall thickness, one piece push rod, ya can't go wrong.
Eddie

Pretty Will

what about diameter? 3/8 5/16?

thegazman

Are you installing roller rockers? If so, you will need to follow Vette79C-3's advice, use a push rod lenght checker prior to buying new push rods. Plus you need to be sure the push rod ends match the size of the recess on the end of your rockers.

MakoShark77

diameter will depend on your rockers. Don't skimp here...I tried cheap Comp Cams pushrods once. Bent one on the way to a friends wedding. I was so pissed! Replaced them with Trick-flow 1 piece hardened push rods. Problem solved.

b71vette

this is definitely sound advice, I know from experience. fortunately I was able to return a set of the wrong length pus hrods. roller rocker arm geometry varies from mfg to mfg. I changed from 1.6 ratio Cat Power Rocker to 1.6 ratio Scorpion and had to go to a stock plus .250 pushrod. Comp sells a decent push rod length checker. I believe Comp Cams website has a tech doc on how to go about checking pushrod length with the tool.

Pretty Will

I think i am in pretty good shape now, I went ahead and ordered the trick flow one piece rods and a set of full roller rockers. thanks for the info guys, big help.