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Thread: My last BBC help question.... I hope...

  1. #1
    Senior Member EXPERT BUILDER
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    My last BBC help question.... I hope...

    my 468 has a casting number 7416 gm 1053 steel 4" stroke crank that has been Nitrided and 7/16 dimple rods with arp standard 8740 rod bolts. It has srs pop up pistons and LS6 heads with a roller cam etc etc..

    my question is what would be a safe rpm/HP level with this crank and rods? I got a great deal on the shortblock and I am just hoping I can use it safely.

    My car is geared for 1/8 mile with 4.86, all but 1 of the tracks I race at is 1/8. but if I sneak off to the 1/4 mile track I would need about 7400 out of this...

    thank you for your help...
    Josh VanHorne

    1964 Chevy Nova
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  2. #2
    Senior Member RACING JUNKIE
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  3. #3
    Senior Member RACING JUNKIE
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    Re: My last BBC help question.... I hope...

    Quote Originally Posted by DragsterJosh
    my 468 has a casting number 7416 gm 1053 steel 4" stroke crank that has been Nitrided and 7/16 dimple rods with arp standard 8740 rod bolts. It has srs pop up pistons and LS6 heads with a roller cam etc etc..

    my question is what would be a safe rpm/HP level with this crank and rods? I got a great deal on the shortblock and I am just hoping I can use it safely.

    My car is geared for 1/8 mile with 4.86, all but 1 of the tracks I race at is 1/8. but if I sneak off to the 1/4 mile track I would need about 7400 out of this...

    thank you for your help...
    I wouldnt want to take it over 7000 but thats just me you can get away with it though. I had a gm crank in my 468 last year, it was a decent crank not sure what motor made but ran 8.0'[email protected]
    David Lanning
    IHRA NHRA 387B

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  4. #4
    Senior Member RACING JUNKIE
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    I read somewhere that GM "suggests" a 7200 rpm limit on 454 a.d 7400 limit on shorter stroked 396/427.Stock,production motors :shock: Intermittent,not constant.I used to take my 402 with stock CAST crank and rods to 7000+ all the time,no problems.But...when you're in high school and don't know any better seems like you could get away with more.If it is properly balanced and you have no valve control problems(which I imagine it is and I doubt you will)I'd think you'll be fine.But I wouldn't want to do it every weekend.But that's an opinion from a non-professional engine builder.Remember that !!!
    "The problem with quotes on the Internet is that you cannot confirm their validity"- Abraham Lincoln

  5. #5
    Senior Member RACING JUNKIE
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    I had a 454 with a 1970 factory forged crank...whatever that is. I know it is steel. took it to 7200 many times...









    oh yeah.....it blew up. :lol:

    no it broke a lifter and destroyed the block but crank lived.


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