4 bolt main or 2 bolt main???
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5.0 and 5.7 Discussion, 4 bolt main or 2 bolt main??? in Cadillac Engine Technical Discussion; Hi everyone, I have a 92 Brougham with the 5.7L 350ci. Is this motor a 4 bolt main or a ...
  1. #1
    92cadbro is offline Cadillac Owners Member
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    4 bolt main or 2 bolt main???

    Hi everyone, I have a 92 Brougham with the 5.7L 350ci. Is this motor a 4 bolt main or a 2 bolt main?

    Thanks in advance

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  3. #2
    soxx35 is offline Cadillac Owners Member
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    Re: 4 bolt main or 2 bolt main???

    2 bolt

  4. #3
    92cadbro is offline Cadillac Owners Member
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    Re: 4 bolt main or 2 bolt main???

    How come I have heard that all 350ci engines are 4 bolt main?? This isn't true??????

  5. #4
    90Brougham350's Avatar
    90Brougham350 is offline Cadillac Owners Connoisseur
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    Re: 4 bolt main or 2 bolt main???

    Nope, truck engines are 4-bolt, passenger car engines are 2-bolt. There's exceptions, but that's an easy way to think of it, at least as far as the TBI motors are concerned.

  6. #5
    92cadbro is offline Cadillac Owners Member
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    Re: 4 bolt main or 2 bolt main???

    90Brougham350, yould u know what are these exeptions?? I swear i've always known that 350's are all 4 bolt. This is new info to me!!

    It kinda sucks not having it though......unless mine is a "exeption"...

  7. #6
    90Brougham350's Avatar
    90Brougham350 is offline Cadillac Owners Connoisseur
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    Re: 4 bolt main or 2 bolt main???

    Unfortunately I can't be of much help more on this. N0DIH can certainly chime in though, he would know more about this than I would.

  8. #7
    bigbluebrougham's Avatar
    bigbluebrougham is offline Cadillac Owners Fanatic
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    Re: 4 bolt main or 2 bolt main???

    My 1993 Chevy Silverado must have been an exception. Right before I got rid of it, I replaced the oil pan gasket on it (PITA!) and it was a 2 bolt main. Got rid of it because when I started it, there was a nice main bearing clatter for about a 1/2 a second. It had 200k on it when I got rid of it. Anyway, don't mean to ramble on and jack your thread...just my .02 cents.

    If you can find your block number, I can tell you if it is a four bolt or two bolt.

    BBB

  9. #8
    92cadbro is offline Cadillac Owners Member
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    Re: 4 bolt main or 2 bolt main???

    bigbluebrougham, where can i get my block number? im guessing it's on the block, but where?? Can you find out if its a 4 or a 2 with the vin number?

    Thanks

  10. #9
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    bigbluebrougham is offline Cadillac Owners Fanatic
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    Re: 4 bolt main or 2 bolt main???

    I can't. There are vin decoder websites out there. I don't know if it will tell you 2 or 4 bolt with the vin decoders. The casting number is located on the driver's side, top rear of the engine block. It is right behind the head. This should be a 7 or 8 digit number. I am going to throw a wrench in here though...some blocks have the same casting number but may have 2 or 4 bolt mains. If you find the casting (starts with a 140... I think for 92's) number, I can tell you what it should have though.

    BBB

  11. #10
    boatman is offline Cadillac Owners Member
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    Re: 4 bolt main or 2 bolt main???

    Quote Originally Posted by 92cadbro View Post
    How come I have heard that all 350ci engines are 4 bolt main?? This isn't true??????


    Nooooooooo, not al all!!

  12. #11
    90Brougham350's Avatar
    90Brougham350 is offline Cadillac Owners Connoisseur
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    Re: 4 bolt main or 2 bolt main???

    2-bolt motors can still take quite a beating, I believe at least 450 horses without a problem.

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