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TBI engine: 2-bolt or 4-bolt?

Discussion in 'The Garage' started by 91GMCSuburban, Jan 11, 2005.

  1. 91GMCSuburban

    91GMCSuburban 1/2 ton status

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    91 350 TBI: is it a 2-bolt or 4-bolt?
     
  2. sled_dog

    sled_dog 1 ton status

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    2 bolt. Haven't seen a TBI 4 bolt yet myself. People get too hung up on 2 bolt vs 4 bolt. Unless you are building a 550HP motor 2 bolt is perfectly fine.
     
  3. darkshadow

    darkshadow 1 ton status

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    i think you can get a kit to make a 2 bolt a 4, and it is supost to be stronger i think :dunno:
     
  4. sled_dog

    sled_dog 1 ton status

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    splayed 4 bolt setup. I may do that to my 383(tbi 2 bolt base block) but I might be throwing nitrous at that so you know.
     
  5. 91GMCSuburban

    91GMCSuburban 1/2 ton status

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    thanks,

    thats what i needed.
     
  6. tarussell

    tarussell 1/2 ton status

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    Depends on what it came in . Every 3/4 Ton truck with C6P option and every 1 Ton TBI truck I have torn down has come with 4 bolt mains on a 350.
    I do agree with build the 2 bolt block if you got it - most folks that feel they NEED a 4 bolt block will do just fine with out them.
    HTH, Tom
     
  7. ratzila

    ratzila 1/2 ton status

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    The motor that came out of my 90 3/4 burb was a tbi 4 bolt 350. The guy that bought it said it did not look like an original motor but a crate replacement.
     

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