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Thread: Choosing a BIG Cube BBC Street Engine

  1. #1
    Senior Member EXPERT BUILDER
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    Choosing a BIG Cube BBC Street Engine

    So I'm looking to buy a pump gas BIG Cube BBC for the street,how do I decide what to buy? Is there any advantage in a bigger bore or bigger stroke engine? Comparing bores and strokes is there a more efficient engine or easier one on parts compared to another? There are so many to choose from in the aftermarket world.

    Hope this is right:
    Size Bore Stroke Rod
    540 4.50 4.25 6.385
    555 4.56 4.25 6.385
    565 4.60 4.25 6.385
    572
    582 4.60 4.375 6.535
    598 4.60 4.50 6.535
    If a 5 lb hammer can't fix it,it must be electrical
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  2. #2
    Senior Member RACING JUNKIE
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    I have old school thinking, if it doesnt need to be bored why do it.

    One of my favorite combos is a 4.25 stroke with a 4.530 bore making a 548, or you could gi 4.375x.453 and make a 564 out of it. The stroke does help. I've seen both these combos work well. I also think using a longer rod instead of a shorter rod may help a little.

  3. #3
    Senior Member RACING JUNKIE
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    hammer, having a longer or shoter rod, does that determine the
    placement of the wrist pin on the piston? or does the hieght of the
    piston change? shorter piston longer rod, longer piston, shorter rod?
    i have always been amazed on the 396 w/11 to 1 comp. using pump
    gas due to a longer stroke, not sure on the rod or piston size,
    but that combo worked well with power to boot :wink:

  4. #4
    Senior Member RACING JUNKIE
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    Quote Originally Posted by signsbyesa
    hammer, having a longer or shoter rod, does that determine the
    placement of the wrist pin on the piston? or does the hieght of the
    piston change? shorter piston longer rod, longer piston, shorter rod?
    i have always been amazed on the 396 w/11 to 1 comp. using pump
    gas due to a longer stroke, not sure on the rod or piston size,
    but that combo worked well with power to boot :wink:
    Wrist pin height change on the piston.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
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  5. #5
    Senior Member RACING JUNKIE TheRabbit's Avatar
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    Quote Originally Posted by hammertime
    I have old school thinking, if it doesnt need to be bored why do it.

    One of my favorite combos is a 4.25 stroke with a 4.530 bore making a 548, or you could gi 4.375x.453 and make a 564 out of it. The stroke does help. I've seen both these combos work well. I also think using a longer rod instead of a shorter rod may help a little.
    X2. A 548 is a simple and cheap big cube build. I had one and loved it. And it gives you plenty of rebuild room for years to come.

  6. #6
    Senior Member RACING JUNKIE
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    Providing your car is not a heavyweight, 540 to 580 inches in a street car will have the torque to get you up to the speed limit. I agree with Hammer and Rabbit, keep bore standard for cooling and future rebuild.
    Hone and go. Why spend $$ to bore .030 to gain 7 or 8 inches? You cannot tell the difference on the street.
    JMO Dave
    Dave
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    "All that is necessary for the triump of evil is for good men to do nothing" Edmund Burke

  7. #7
    Senior Member RACING JUNKIE fla1976's Avatar
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    Big cubes

    I would leave the bore stock as long as possible . I'm a firm believer in boring only when necessary. When selecting a rod, I'd go with the longer rod to allow longer dwell at TDC of the ignition stroke. JMO.

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    If you order a Dart Big M block what is the bore size you get? Is it a 4.50 right off the bat,is that where they start?
    If a 5 lb hammer can't fix it,it must be electrical
    Keep the shiney side up! 8)
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  9. #9
    Administrator RACING JUNKIE bjuice's Avatar
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    something to think about if you go with longer stroke and have TQ monster HEALTHY 565-582 ci street motor..there is a chance your not gonna Enoy it too much cause its gonna blow the Tires off everytime you roll into the gas....i guess you can always put a 200 something gear in it that may help some of that.


    i personally lean toward a little more Bore on a TRUE street engine..

    just another way to look at things
    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "

  10. #10
    Senior Member RACING JUNKIE
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    Quote Originally Posted by hammertime
    I have old school thinking, if it doesnt need to be bored why do it.

    .
    I AGREE


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