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-   -   '96 vortec 454 push rod broken after head job (http://www.hotrodders.com/forum/96-vortec-454-push-rod-broken-after-head-job-100782.html)

LYNN MYERS 10-21-2006 04:00 PM

'96 vortec 454 push rod broken after head job
 
We have broken about 7 intake push rods, while idleing after installing rebuilt heads. The dealer shows no service bulletins. Any ideas?

Lynn

NorthStar 10-21-2006 04:51 PM

How close are the springs to coil bind at max lift? Also retainers may be hitting tops of guides.

I saw this happen once with Rhodes lifters, engine would idle all day long soon as it was revved up cam key would shear off. Not a bent pushrod but maybe pushrods are the "fuse" this time.


Are you using the correct lifter and pushrod combination?
Seems to me the Vortec big blocks use different lifter & different pushrod length than the earlier gen 4 big blocks.

LYNN MYERS 10-22-2006 09:36 PM

454 broken push rod
 
Greg, I'll ck with machine shop. He might not realize this is a vortec, or there is a difference. Thanks for the tip. I'll let you know how it goes.

Lynn

BOBCRMAN@aol.com 10-22-2006 09:46 PM

Also check valve stem to guide clearance. Too tight will stick valve and bend pushrods. BBC's need a little extra clearance.. Been there.

LYNN MYERS 10-22-2006 10:50 PM

Dhevy 454 broken push rods.
 
Thanks, the machine shop assembled the heads and they installed a "bearing" as they call it below the spring. Perhaps this has something to do with it. I'll check back with them. Will update the site when I know.

Thanks again.

lm


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