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383 forged or cast?

Discussion in 'The Garage' started by 91GMCSuburban, Jun 13, 2005.

  1. 91GMCSuburban

    91GMCSuburban 1/2 ton status

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    What should I do? What did you do? Pro's and con's besides cost?
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Generally , forged is best , but most people never use the motor enough in a truck to warrant it .
     
  3. Bhintz

    Bhintz 1/2 ton status

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    if your going over 6k rpm or 450 hp Id go forged but if not cast
     
  4. BAJA_BLAZER

    BAJA_BLAZER 1/2 ton status Author

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    Use Hypereutectic Pistons!
     
  5. 91GMCSuburban

    91GMCSuburban 1/2 ton status

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    Why?
     
  6. 91GMCSuburban

    91GMCSuburban 1/2 ton status

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    Based on calcs, 315 HP @ 5000 rpm, 485 ftlbs. So not high revving.
     
  7. Bhintz

    Bhintz 1/2 ton status

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    Ill 2nd that, only a 20 bucks more and hold power a lot better
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    I believe this article came from Keith Black originally.
     
  9. gambit420s

    gambit420s 1/2 ton status

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    i believe that the extra silicon in a hypereutectic aluminum alloy allows it to be heat treated better and more closely matches the expansion rate of cast iron than forged pistons, because of this a forged piston usually require more bore clearance than cast, allowing for greater piston rock and shorter service life, but they are definately more suited to high hp setups albeit with less life

    my machinist put it this way for a sbc 350-400hp> cast or hypereutectic, 400hp<forged

    i just got 345np sealed power for a 350 and he said it was about perfect for my app(300ish hp, mild cam, low reving 350)

    now if i can only make it run..... :(
     
  10. CyberSniper

    CyberSniper 1/2 ton status Premium Member

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    Forged crank if you're going to run more than 450hp@6500rpm. Probably get away with 500hp@6000rpm. The important part is to have it all balanced. You need to run ARP studs if you're pushing that kind of power.

    Forged pistons aren't really necessary unless you have forced induction or nitrous.

    Hypoeutectic pistons are kind of neat... they cost more but are actually more cost effective than regular cast pistons. Due to the cheapness of the metal and how the pistons almost always past quality control they're actually easier and cheaper to make. They're a far cry from a set of Wiseco forged pistons.
     

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