Question about 2001 Chevrolet Silverado

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I have a 1963 Corvette with a 327 that makes a slight knocking sound for just a few seconds when you shut the engine off after it's warm. It doesn't knock at all while running and the oil pressure seems to be fine when it's running. Is this something I should worry about?

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  • Greg Bernett
    Greg Bernett May 11, 2010

    Possibly your oil pump may be failing....watch for more info here.

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Turns out it was a very slight detonation...adjusting the timing worked. Strange because I had just tuned it up, I might have gotten some bad gas.

Posted on Jun 26, 2009

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I have a 1963 Chevy stepside with a 327 engin, after reaching running temperature, it wont start


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NOISE WHEN COLD THEN GOES AWAY WHEN WARMS UP,SOMEONE SAID MAIN BEARINGS GOING BAD


Hard to say over the internet but I will try to explain. If the noise is a distict KNOCK KNOCK and it sounds like it is coming from the bottom of the engine, then it most likely is a rod or main bearing. If it is a TAP TAP noise that sounds like it's coming from the top of the engine, then most likely a valve lifer is failing/failed.
the fact that it goes away when the car is warm, makes me lean towards a bad lifter. Normaly if a bearing is bad and knocking, the noise doesn't go away.

The KNOCK noise will be somewhat hollow sounding and the TAP TAP sound will be more solid. If the KNOCK KNOCK is solid, then a rod or main bearing has most likely failed to the point that a new/reman engine will be needed.

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Hello! Answer to follow shortly...Guru...Saailer

I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

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I can't find a factory specs cam for my 1963 327/340 Chevy Corvette. I hope you can help. Thanks, David Wilkes or dewilkes@go.com.jo And, yes I do live overseas but will move back to Texas next summer.


If I remember correctly I believe that was a Duntov "0-97" flat tappet camshaft. There was also a slightly more aggressive grind hydraulic cam but I don't think either are available anymore. Best you can do and likely the most cost effective is to contact someone at crane cams or some other cam manufacturer and give them all the specifications on your vehicle and they can maker a suggestion on a specific replacement cam that will fit your needs. You can come out actually better this way because you can pick a cam that will work with your engine, gearing and anticipated use, putting the torque curve exactly where you want it..

Oct 11, 2009 | 1965 Chevrolet Corvette

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