Bbc firing order
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Bbc firing order

  1. #1
    AAARRRRRGGGGGGG!!!!! Motomatt68's Avatar
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    Default Bbc firing order

    I finally got my engine together after a year long build due to some unexpected extra costs. When I fired it up it ran like crap, wouldn't idle, dies after a few seconds and smelled like raw fuel, backfired... So I re checked the timing and the plug wires. My compcams cam came with the 4-7 swap. It still ran the same so I pulled the valve covers and watched the valves while I rotated it by hand and came up with 1,8,7,2,6,5,4,3. I checked a couple of times but came up with the same thing. I can't find this firing order anywhere on the web and was not told by comp cams about it. Does anyone here know anything about this? I have not re fired it because I want to figure this out first.

    Anything would be helpful. Thanks, Matt.
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  3. #2
    Senior Member 19ftDana's Avatar
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    BBC firing order is 18436572
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    Senior Member EVILFORCE's Avatar
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    The orignal order was 1-8-4-3-6-5-7-2. With the 4-7 swap it should be 1-8-7-3-6-5-4-2. Maybe the cam is not a swapped cam. Be sure the rotation on the cap is clock-wise
    No Fool Like A Old Fool is there?
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    I didn't think of the dizzy rotation so I went out and checked and it is definately clockwise. Has anyone heard of a 2-3 swap. I don't know what cores are like but I figured this would have to be deliberately done. Not maliciously but intentional so I figure there must be a reason.

    Matt.
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  7. #5
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    Maybe this is the worlds first 4-7 2-3 swap cam.

    Matt
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    Senior Member wizbang's Avatar
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    Quote Originally Posted by Motomatt68 View Post
    Maybe this is the worlds first 4-7 2-3 swap cam.

    Matt
    I might be wrong, but, is that the "LS1" firing order ?
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  9. #7
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    I searched a couple of times and came up with nothing then I simplified my search and it is the firing order for the ls1.

    So what damage did I do by running it with the wires crossed?

    Matt.
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  10. #8
    Senior Member EVILFORCE's Avatar
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    Quote Originally Posted by Motomatt68 View Post
    I searched a couple of times and came up with nothing then I simplified my search and it is the firing order for the ls1.

    So what damage did I do by running it with the wires crossed?

    Matt.
    Depends on how you adjusted valves.That is not good turning a motor over like that. I think you know what I meen. Crossed wires might pop a power valve in the carb if running a Holley
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  11. #9
    AAARRRRRGGGGGGG!!!!! Motomatt68's Avatar
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    I knew when I asked if it would damage that there was no way to answer it with the info provided but on the off chance that some would tell me everything was going to be ok, that there was no way I could have done any damage, that it might even make the engine run better, I will keep asking.

    Thanks for all the replies, I will cross my fingers and fire it up.

    Matt.
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  12. #10
    Or Seth, either one Budweiser's Avatar
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    What is the part # for the cam?
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    Senior Member Bubbletop409's Avatar
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    There are cams that also swap 2-3, and the firing order is the same as an LS engine
    Larry

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  14. #12
    Senior Member Bubbletop409's Avatar
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    Quote Originally Posted by Motomatt68 View Post
    Maybe this is the worlds first 4-7 2-3 swap cam.

    Matt
    Not the first, just not as common as just the 4 7 swap
    Larry

    62 Bel-Air 409
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  15. #13
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    Quote Originally Posted by Budweiser View Post
    What is the part # for the cam?
    Part # **46-000-9

    I don't know if he customized it for me or not but I had their boat tech choose it for me. I don't remember his name.

    Matt.
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  16. #14
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    Sounds like it should! My fuel feed leaves something to be desired so I couldn't check it outvery well but I think things are good.

    Thanks, Matt.
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