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Old 01-11-2010, 01:11 PM
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350 Crate Engine: Loud humming sound after engine warms up

I was wondering if anyone could help me troubleshoot a loud humming sound on a new 350 crate engine (85' gmc pickup)? Everything sounds and works great when I start the engine...but after a few minutes (engine warms up) I get this fairly loud humming sound.

I have all emission hose connected.

When I lift the PCV valve out of the valve cover the sound goes away.
I check for leaks around the base of the carb and looked for cracks in any hoses, but didn't not see anything...

Pretty much everything on the engine is new: carb, intake, headers, valve covers, distributor, etc.

Any ideas or tips would be greatly appreciated!

Thanks

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Last edited by sofa1515; 01-11-2010 at 02:15 PM.
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Old 01-11-2010, 06:19 PM
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Quote:
When I lift the PCV valve out of the valve cover the sound goes away.

Pretty much everything on the engine is new:
Ayuh,... How about the pcv valve,..??
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Old 01-11-2010, 06:48 PM
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The PCV is brand new...and seems to be work as it rattles when i shake it. I guess it could be the grommet. Thanks
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