Noisy SBC top end?
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  1. #1
    Compulsive chicken choker English Impala's Avatar
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    Noisy SBC top end?

    I appreciate its difficult to describe a noise, but on my SBC on tickover there is a noticeable noise coming from around No.8 cylinder, from the valve gear. Car seems to run okay, oil pressure good, low mileage engine. It sounds like a tappet needing adjusting, but they are hydraulic!

    Any ideas?

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    draggin bumpers unity_neil's Avatar
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    Quote Originally Posted by English Impala View Post
    I appreciate its difficult to describe a noise, but on my SBC on tickover there is a noticeable noise coming from around No.8 cylinder, from the valve gear. Car seems to run okay, oil pressure good, low mileage engine. It sounds like a tappet needing adjusting, but they are hydraulic!

    Any ideas?
    Have you checked the exhaust manifold bolts? mine were always coming loose and generating a tick from the leaking gasses.

  4. #3
    richard rawlplug Torment's Avatar
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    could be the rockers..?? are they roller type or normal??


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    Rare, but you could have a faulty tappet [manufacturing defect ?], try adjusting , if no luck delve deeper...

  7. #5
    capriac capriac's Avatar
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    Had the same in my crate motor, Changed the oil and filter and cured the tap!

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    Official RnS Addict Stitch's Avatar
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    Quote Originally Posted by Torment View Post
    could be the rockers..?? are they roller type or normal??
    2nd'd , check the rockers , they're known to crack around the slots from fatigue , also as Neil said loose header bolts can cause some worrying noises .
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  9. #7
    [url=http://www.nobrain.d NoJive 55's Avatar
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    Talking

    If It sounds like a tappet needing adjusting why dont you adjusting it and see if it stops........



    Bob.....

  10. #8
    I'm a grown up drunk! chevy2's Avatar
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    [QUOTE=English Impala;58136) It sounds like a tappet needing adjusting, but they are hydraulic!

    Any ideas?[/QUOTE]

    initially check the rocker condition, cracks etc,
    check the adjusting nut or poly-lock hasn't worked loose,
    another thing to check on stock s/block heads is the press-in rocker studs,
    a mate 2 of these work loose at separate times causing a rattle each time.

  11. #9
    Official RnS Addict mikeyboy's Avatar
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    Pull the valve cover and do a valve lift check with a dial indicator,you may have a worn cam lobe.

  12. #10
    Official RnS Addict chris's Avatar
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    thicker oil

    or insulate the rocker cover - with jam and cabbage leaves (iv heard about it from a 'web expert', it works, honest )

    remove any silencers in the exhaust system so you just cant hear anything else at all

    tell everyone its an old racing engine and its sposed to sound like that as its got a solid lifter cam

    ignore me and try a few of the helpfull suggestions up there ^^^

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