power limit on gm block
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power limit on gm block

  1. #1
    Senior Member stallion176's Avatar
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    Default power limit on gm block

    Just curious as to how much grunt a stock block will take. I'm at 1200 or so on my 496 4bolt deal. Thinking of stepping it up some more. What is too much?
    Youngblood TX-20 Twin Turbo 496ci bbc {TURBO BOYZ}

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    Ain't Right Racin piston in the wind's Avatar
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    IMO your there

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    Its not a matter of if at this point, it is a matter of when it will go.
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    3HP is an A$$ Whooping!!! JW

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    Senior Member stallion176's Avatar
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    It has probably 50 passes on it and so signs of fatigue. Guess I should count my blessings. Haha
    Youngblood TX-20 Twin Turbo 496ci bbc {TURBO BOYZ}

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    steelcomp was here
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    It won't warn you. Turbo power is definitely "easier" on things, but IMO you're there. The answer is really "whatever it'll take". Problem with limitations is, you never find them till you exceed them.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Senior Member wizbang's Avatar
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    We are using the stock block, made 1400 on the dyno, it now has two years of run time on it ?

    BUT, I leaned on it a little too hard in Burley and hurt one piston, so we had to take it apart and replace that piston.
    The engine is very nice inside, even after the two years.

    Stock caps, 445 casting from a 89 Suburban !

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    Senior Member stallion176's Avatar
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    Quote Originally Posted by wizbang View Post
    We are using the stock block, made 1400 on the dyno, it now has two years of run time on it ?

    BUT, I leaned on it a little too hard in Burley and hurt one piston, so we had to take it apart and replace that piston.
    The engine is very nice inside, even after the two years.

    Stock caps, 445 casting from a 89 Suburban !
    Nice. What power adder
    Youngblood TX-20 Twin Turbo 496ci bbc {TURBO BOYZ}

  10. #8
    gn7
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    Quote Originally Posted by wizbang View Post
    We are using the stock block, made 1400 on the dyno, it now has two years of run time on it ?

    BUT, I leaned on it a little too hard in Burley and hurt one piston, so we had to take it apart and replace that piston.
    The engine is very nice inside, even after the two years.

    Stock caps, 445 casting from a 89 Suburban !
    Like Pat Eason would say, you're racing with the engine from a MOHO!
    SOOOOOO Brain, is that block filled?
    I have NO doubt that (BEAUTIFUL) beast makes every ounce of 1400, but does Too Tall REALLY make that much THE ENTIRE RACE while kicking ass up and down the track?
    Think Charlie was asking more of that stock GM block than Bill was demanding of the one in our boat.
    Quote Originally Posted by stallion176 View Post
    Nice. What power adder
    Its a blown alky that runs ALMOST as well as it looks.




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    Senior Member wizbang's Avatar
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    Quote Originally Posted by stallion176 View Post
    Nice. What power adder
    TBS 8-71 Delta Retro Billet case @ 25 over

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    Senior Member wizbang's Avatar
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    Quote Originally Posted by gn7 View Post
    Like Pat Eason would say, you're racing with the engine from a MOHO!
    SOOOOOO Brain, is that block filled?
    I have NO doubt that (BEAUTIFUL) beast makes every ounce of 1400, but does Too Tall REALLY make that much THE ENTIRE RACE while kicking ass up and down the track?
    Think Charlie was asking more of that stock GM block than Bill was demanding of the one in our boat.

    Its a blown alky that runs ALMOST as well as it looks.
    It is not filled at all. I've thought about trying that only to see if it would retain some heat ????

    The big guy is getting more comfortable driving it, seat time is good.
    Fresh engine in it for the Beach !
    ( I'm still waiting on a new piston for the "worn out" engine )

  13. #11
    Icy
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    Quote Originally Posted by wizbang View Post
    It is not filled at all. I've thought about trying that only to see if it would retain some heat ????

    The big guy is getting more comfortable driving it, seat time is good.
    Fresh engine in it for the Beach !
    ( I'm still waiting on a new piston for the "worn out" engine )
    What happened at LB to the motor? Did you tear it down?

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    I have been wondering this myself...I would like to step up to a 496 rotating assembly from my current 468 and put about 15lbs of boost to it...I just wonder it that isn't asking a lot of a stock 4 bolt block.

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    468 chevy stock block, 14lbs of boost from an 8-71 and a 300 hit of nitrous in a 32 ford coupe, makes 1,032 to the rear tires and have been running the same block for 12 years!! The car sees about 100 miles of street driving a week and may 8 second passes at the strip, it gets beat on!!

  16. #14
    Led
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    Aftermarket blocks are intended for power, stock blocks , but i run a 445 block and have seen many stock blocks and even iron headed blown alky deals be worry free all season making 7-8 passes at the races.
    After a build or two i do ask myself then I look at the sponsorship funds...$0. Run what you brung! then if or when it comes apart! then Repeat!

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