sbc firing order

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  • November 08, 2009 09:57 PM - 3394 Views
    ronhotrod I have a customers car in my shop for some repairs/updates and found something that I've heard of but never seen until now. Instead of the usual sm block firing order this car is wired with #4 and #7 reversed. so it fires 1-8-7-3-6-5-4-2 Why?? Is it a special performance camshaft requirement?
     

     
     
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  • Comments
  • bigdude Rides Info - three rivers, Michigan
    November 09, 2009 06:45 AM
    bigdude

    Yes! They do that in drag cars for a better balance-it does use a diff cam. Dont know why someone would need that for the street.

     
  • Buddy g Info - monticello, Kentucky
    November 09, 2009 04:44 PM

    Ron I was talking with a frind of mine last week that builds race engines. He thinks its a waste of money, you still have 4&2 still fire in line. Buddy   

     
  • j frankosky Info - columbia, New Jersey
    November 16, 2009 07:45 PM

    The 7-4 swap cam is good for extra horsepower if you are searching for every possible pony you can find.

    I too have only heard of using these cams for racing.  I think they are quite expensive.

    Might be an interesting part on a rod.

     
  • blade58 Rides Info - apopka, Florida
    November 16, 2009 08:18 PM
    blade58

    HOTROD TV did this a couple of years ago they dyno the engine before the cam swap and afterwards

     
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  • ronhotrod Rides Info - mount washington, Kentucky
    November 16, 2009 09:52 PM
    ronhotrod

    my customer bought this car at the Nats in Lou and I am 'fine tuning' the wiring and such.  it sounds awesome and shakes the entire car almost violently!  too much for my taste, but then I'm an old guy  Thanks for the info guys

     
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