bbc question

Discussion in 'PSI Superchargers Tech Questions' started by mike cioci, Dec 17, 2009.

  1. mike cioci

    mike cioci New Member

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    how much horsepower can a stock 502 or 454 block and forged crank take in a blown alcohol app....back in the 60s and 70s thats all they used ...right?...with nitro....i dont think i ever seen a forged crank break or leave the car ...that i can remember.....maybe 1500 hp or is that pushing it...
     
    #1
    mike cioci, Dec 17, 2009
  2. Wildcatracing

    Wildcatracing Member

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    I ran a 2 bolt partially filled block with splayed moroso caps and steel rods at approx 1200hp for years with no problem . Cheers
     
    #2
    Wildcatracing, Dec 17, 2009
  3. Blownalky

    Blownalky Top Sportsman

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    Ran 1450 HP on stock block and stock steel crank, had some fretting on main caps but worked good for more than 75 passes.
     
    #3
    Blownalky, Dec 17, 2009
  4. blowntrifive

    blowntrifive Member

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    Ran 1380 hp on a stock gm block all season tore apart this winter and all is great no problems at all, 1200 on this set up all day I believe.
     
    #4
    blowntrifive, Dec 19, 2009
  5. SoDak

    SoDak Active Member

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    Are you guys talking blocks that actually came out of cars/pickups? Are these short deck? Or are they GMPP blocks.

    We couldn't keep truck blocks together making 1430 HP but we were detonating at one spot in the RPM band and didn't know it.
     
    #5
    SoDak, Dec 20, 2009
  6. Blownalky

    Blownalky Top Sportsman

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    Mine were short deck factory 4 Bolt blocks (not the factory HP aftermarket) filled to the water pump holes. Like I said, had some fretting of the main caps but I also had that on a splayed billet Dart block (short deck). Since going to KB-Olds, no sign of that. The other problem you may run into on stock blocks are cracks from the head studs to the bores and pulled head studs because of thin decks. If you are starting from scratch, use a New Century or KB Block. If Dart or World Products made a skirted block and weight was not a problem, that would be an option. My 2 cents.
     
    #6
    Blownalky, Dec 20, 2009
  7. blowntrifive

    blowntrifive Member

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    Mine was a 1973 454 bbc stock gm block 9.800 non filled ran 1300 on it all season and turned it up alittle at the end to 1400 hp no problems at all I just pulled it and I'm replacing it with a dart block but I know I could of ran it more @1200 hp with out issue. Ran my 57 chevy @ 3505lbs to a best 8.14@170 this season.
     
    #7
    blowntrifive, Dec 20, 2009
  8. twinturbo496

    twinturbo496 New Member

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    More of a question than an answer: Doesn't this also require an RPM consideration? The load on the crankshaft from 900 hp NA @ 9000 RPM may be higher than 1300 hp blown @ 7500 rpm.
     
    #8
    twinturbo496, Dec 22, 2009
  9. mike cioci

    mike cioci New Member

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    yes gmpp blocks ....filled....no water....stock 4 bolt main caps...8000 rpm at the most
     
    #9
    mike cioci, Dec 23, 2009

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