4-bolt Factory Roller 350?

Discussion in 'Engine Topic' started by El Guapo, Jan 3, 2005.

  1. MEAN_SBC

    MEAN_SBC Veteran Member

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    Nov 24, 2003
    Amarillo TX USA
    My 383 is a one piece rear main 4 bolt block....... So they have to have made one... It's a rather new block...

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    Brant
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  2. MyBoTy

    MyBoTy Veteran Member

    1,560
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    Feb 9, 2002
    Lubbock, Texas USA
    Plenty of 'em around, just keep looking.
     
  3. El Guapo

    El Guapo Veteran Member

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    Feb 18, 2004
    Greensboro, NC USA
    OK, sweet. I'll start at the bone yards with the trucks and vans and see what I come up with.
     
  4. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

    14,125
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    Mar 25, 1999
    San Jose, CA, USA
    I thought only LT1 vettes got 4-bolt mains.

    Truth be told it does not really matter. A 2-bolt main is good to about 550HP and that is pretty much the limit for a street car

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  5. Blue70SS

    Blue70SS Member

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    Dec 31, 2003
    Worcester, MA, USA
    To the best of my knowledge all L98 Corvettes through '91 (last year) came stock with 2-bolt main blocks.

    If you really want to make it strong find one of these and have it machined for splayed 4-bolt main caps.
     
  6. Dirt Reynolds

    Dirt Reynolds Veteran Member Lifetime Gold Member

    3,625
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    Jan 17, 2003
    BC, Canada
    The L98's used in the Corvette are not the same block as used in the L98 f-bodies.

    F-body L98's are 2-bolt mains.

    Corvette L98's are all 4-bolt mains.

    All truck one-piece rear main 350 blocks are 4-bolt mains.

    Not all truck one-piece rear main 350 blocks used roller cams, but they are roller blocks.

    Hope that clarifies the issue.



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    'Silver Bullet' 1977 Z-28 413" SB
    11.73 @ 115.10 and dropping...
    Old Vortec combo:
    12.15 @ 110.52
    1989 GTA L98
    Daily driver
     
  7. AJ_72

    AJ_72 Veteran Member

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    Jul 3, 2003
    Chebanse, IL USA
    I have one.

    It's a 350, 4-bolt main, 1 pc rms out of a 1990 3/4 ton.

    The last three in the cast # are 638.

    Go to www.Mortec.com and look there. You'll see that not all 350 blocks that were 1 pc rms were set up for a roller cam. I don't remember the casting number, but I'm sure if you look there you'll find it.

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    350CID, Vortec 062 heads, Magnum 280, Performer Intake, Holley 650 DP, 3.42 rear w/ Auburn posi, 2600 Stall/TC
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  8. rustbucket79

    rustbucket79 Veteran Member

    Wispers quietly to Dirt:
    Many of the truck engines were 2 bolt blocks, esp. the half tons.

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  9. Dirt Reynolds

    Dirt Reynolds Veteran Member Lifetime Gold Member

    3,625
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    Jan 17, 2003
    BC, Canada
    Okay, duly noted. [​IMG]

    No soup for you, Meester Rustbucket! [​IMG]

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    'Silver Bullet' 1977 Z-28 413" SB
    11.73 @ 115.10 and dropping...
    Old Vortec combo:
    12.15 @ 110.52
    1989 GTA L98
    Daily driver
     
  10. rustbucket79

    rustbucket79 Veteran Member

    Soup Nazi! [​IMG]

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    Custom Auto, your source for quality machine work, cores and new parts at competetive pricing right here in British Columbia 1-888-563-4050
    A Canadian, EH? (with a 10 second street car)
     

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