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Engine Swap Question

Discussion in 'The Garage' started by SF87K5, Dec 27, 2002.

  1. SF87K5

    SF87K5 1/2 ton status

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    I have a pontiac 428ci engine in my '79 K5 and can get a GM 400ci complete for $250. I am woundering if I should get the 400 for my '87 K5 or just put the 428 in it. The only problem I have with the pontiac engine is there is a oil leak somewhere and I cannot find it at all. The GM 400 is bone stock but my pontiac engine has a cam, manifold and headers on it already and I am pushing around 350 plus HP and 400lbs torque. What do you guys think would be my best bet on the engine dilmea I am having.
    Thanks for your help.
     
  2. SF87K5

    SF87K5 1/2 ton status

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    There has to be someone who can give me some advice on this topic please.
     
  3. ntsqd

    ntsqd 1/2 ton status

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    Pontiac 428's are fairly rare and at least some, if not all, were 4 bolt main blocks. I would think you could sell it to a Pontiac dude for enough to cover putting all of the same goodies on the 400 and the cost of the 400.
     
  4. SF87K5

    SF87K5 1/2 ton status

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    Cool all I need to know now is how much to ask for my Pontiac 428. Any Ideas?

    Thanks for your guy's help
     
  5. chevyracing

    chevyracing 1/2 ton status

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    </font><blockquote><font class="small">In reply to:</font><hr />
    I have a pontiac 428ci engine

    [/ QUOTE ]


    /forums/images/graemlins/confused.gif?????????????????? /forums/images/graemlins/confused.gif
     
  6. SF87K5

    SF87K5 1/2 ton status

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    My engine in my '79 is a '69 428 V8 wide valley out of a '69 Grand Am.
    Chevyracing you ever heard of it? From your post you sound sceptic about it.
     
  7. bablazer73

    bablazer73 1/2 ton status

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    The 428 Is a high torgue engine. It is also very rare and depending on casting #'s could be worth ALOT! Unless you really need the torque, I might consider the 400 and sell the 428. all early pontiac engines are known for rear main seal leaks as the were really made from rope!! felpro makes a regular seal for them now. your engine also most likely came from a grand PRIX as the fist grand am wasn't made till 73. If you can get the casting #'s from the block and the #'s off the head, I'll try to help you figure what you have. If you can, get the #'s from the head on the center 2 exaust ports. just under the valve cover lip. might say 16 or 62.
     
  8. SF87K5

    SF87K5 1/2 ton status

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    where can I find the block #'s at and what might be the different #'s be?
    Also what do you need more for crawling HP or Torque?
     
  9. nevercomplete

    nevercomplete 1/2 ton status

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    Torque is what you need.
     
  10. Shaggy

    Shaggy 3/4 ton status

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    <font color="green"> HP is just a number, torque is the actual measure of power in an engine. Horsepower is just a function of torque. OK, so you didn't ask that. You want the torque at low RPMs for crawling. /forums/images/graemlins/thumb.gif</font color>
     
  11. SF87K5

    SF87K5 1/2 ton status

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    Cool thats what I thought. In that case I am going to keep my Pontiac V8 428 and just re-build it. /forums/images/graemlins/thumb.gif Hell when it was stock it came with 360 hp @ 4600 and 472 LBS of torgue @ 3200. From what I hear it will make a mean wheeling engine. What do you guys think?
     

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