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Discussion Starter #1
What would cause a knock at idle but only when oil is cold? Spun bearing, maybe?
 

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Also piston slap,had a buick 350 that did it for 80K miles.

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67 RS RAGTOP # matching
4X4 Chevy truck
4X4 Suburban
 

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I agree with the piston slap theory, especially if they are forged. Stocks will do it after many miles, but forged do it until they warm and expand.



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Mark
1992 Firebird 355/Six Speed
1991 RS 350 / Blown (As in Broke)
1987 Toyota Pickup 383 / 500 + HP
**How fast is just a matter of how much $$$ **
 

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Sometimes a loose header or manifold gasket can make some loud ticking, but will go away after the gasket expands from warm up.....this would definitely be a preferred situation...I hope thats what it is...real easy fix.
 

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Discussion Starter #6
I am running 10w40.
 
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