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my 69 chevy truck I believe have a intake sucking air.

This is a discussion on my 69 chevy truck I believe have a intake sucking air. within the Internal Engine forums, part of the LSx Technical Help Section category; I have a 69 Chevy truck that will not idle unless it is set higher than needed The plugs on ...

  1. #1
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    pewter
    99 Trans Am

    Question my 69 chevy truck I believe have a intake sucking air.

    I have a 69 Chevy truck that will not idle unless it is set higher than needed The plugs on all but about three of the cylinders are covered with a black power like covering when driven at normal speed but will clean up if driven at high speed. I have replaced the carb with the one off my Camaro that I know is good but it does the same thing. I checked the compression and all are good I rechecked the timing to make sure it was not too high, I have done a vacuum check at idle it shows about 15 and goes to about 25 when I open the throttle. The engine is a 350 with a comp cam with a 501-501 lift that have a ruff idle, with
    vortec heads and a Edelbrock Rpm intake. I have run this setup for sometime and have never had this issue, intake sucking air?or burnt valves? I have changed the dist. cap and wires from the Camaro but the same.?The compression test showed the highest was 170 and the lowest was 140.
    Last edited by Street Fighter; 06-09-2019 at 04:23 AM.

  2. #2
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/ mods, 00 FBVert

    Have you checked the pcv?

  3. #3
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    pewter
    99 Trans Am

    NO everything but the simple stuff, will do so today thinks I hope that's the cause.

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