'96 vortec 454 push rod broken after head job - Hot Rod Forum : Hotrodders Bulletin Board
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Old 10-21-2006, 03:00 PM
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'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

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Old 10-21-2006, 03:51 PM
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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.

Last edited by Greg Latvala; 10-21-2006 at 03:57 PM.
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Old 10-22-2006, 08:36 PM
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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
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Old 10-22-2006, 08:46 PM
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Also check valve stem to guide clearance. Too tight will stick valve and bend pushrods. BBC's need a little extra clearance.. Been there.
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Old 10-22-2006, 09:50 PM
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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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