Motor Swap

Discussion in 'Engine Topic' started by 1978camaroltrs, Dec 4, 2011.

  1. 1978camaroltrs

    1978camaroltrs New Member

    16
    0
    Dec 1, 2011
    Penticton
    I am wondering if a 1988 Chevy 350 would fit in a 1978 Camaro with a 350, I found a good deal in town on a 1988 chevy 350 with 75,000k on it so im thinking of buying it and throwing it in a camaro that i will be buying soon... will it hook up to a TH350 tranny with no problem or should i buy the 700R4 the guy has for sale aswell?
     
  2. cmonson

    cmonson Veteran Member Gold Member

    4,134
    0
    Apr 7, 2006
    Calgary, Alberta
    It will work without any issues as will as bolt up to a th350.

    You may have to go to an electric fuel pump however as there may not be a provision for a mechanical pump.
     
  3. 1978camaroltrs

    1978camaroltrs New Member

    16
    0
    Dec 1, 2011
    Penticton
    Also the motor is carb if that makes any difference, and yeah no problem I can find an electric fuel pump easily funny you should mention that the guy has a electronic fuel pump aswell..... How much power do you think this car would make with the new motor. :D
     
  4. 2ndgenhunter

    2ndgenhunter Veteran Member

    798
    0
    Mar 19, 2010
    Blairsville,GA
    The 88 LO5 350 only made 220hp new. after 75k I would guess 190hp@ the flywheel.

    If it is carb, Make sure that it has the correct intake on for the 87up heads and not a 86 back intake jerryrigged to work. The 88 LO5 350 was fuel injection from the factory.

    Make sure you get the correct flexplate for the 87 up 350. It has the 1 piece rear main seal.
     
    Last edited: Dec 5, 2011
  5. mildthing

    mildthing Veteran Member

    217
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    Nov 17, 2011
    Benson, Utah
    '88 LO5 was 210 HP @ 4000 RPM, 300 ft-lbs @ 2400 RPM. There never were any LO5s rated 220 HP.
     
  6. 2ndgenhunter

    2ndgenhunter Veteran Member

    798
    0
    Mar 19, 2010
    Blairsville,GA
    My bad, Sorry I missed by 10 hp.
     
  7. 1978camaroltrs

    1978camaroltrs New Member

    16
    0
    Dec 1, 2011
    Penticton
    Need you opinion... I am thinking of buying that motor in the next week or two but in the images it looks like the motor has been ripped apart what should i do?
     
  8. Air_Adam

    Air_Adam Veteran Member

    '88 will have a 1pc rear seal - needs a different flexplate from your '78 block.
     
  9. Ryan 79

    Ryan 79 Veteran Member Lifetime Gold Member

    3,299
    0
    Mar 29, 1999
    Granite Falls, WA
    I did this swap on my 79 pickup.

    First off, the 87,88,89,90 stock 350's are complete dogs. There's no power there. Speaking from experience, I wish I'd have kept the older 400 I had laying around.

    These engines have notoriously low oil pressure. the Haynes manual says 6 pounds at idle, 18 pounds at 2000, and 24 pounds at 3500. So if you install this motor, put an aftermarket gauge on it, and you show almost nothing at idle and 25 pounds at 3K, it's fine, that's just the way they are. My 350 had just been rebuilt, and it still has no oil pressure. It's not a problem, I've worked the piss out of this motor for 3500 miles now, and if the low oil pressure was an issue it would have blown up a long time ago. I've got an Autometer electric gauge in it.

    The heads have a different sized hole in it for the temp sensor. Napa sells a sensor that is supposed to screw into the later head and work correctly with an older gauge, but save yourself $40. It does NOT work. You can either put the stock sender in the water pump or buy an adapter to make it fit.

    You'll need a different flex plate, but the motor should have the casting for a mechanical pump. Just use a stock 350 mechanical pump.

    Those blocks should all be set up for a roller cam, but truck motors came with a flat tappet cam
     
  10. mildthing

    mildthing Veteran Member

    217
    0
    Nov 17, 2011
    Benson, Utah
    The LO5 was used from '87 to '95. '93 saw a change of the rated output, to 200 HP and 310 ft-lbs. Not sure why.
    Converting them to carbureted will kill most of their available responsiveness, no matter how many carburetors and distributors you try.
    The LO5s all offer more output than any LM1 ever installed from '75-'81.
    LO5s love gearing. But you can over-do it.
    If you're running 255/60R15s, then do a 700R-4 with a 3.42:1 gear at most.
    Forget 3.73:1 unless you're running 275/60R15s, which I wouldn't.
    If you're on 235/60R15s, then a 3.08:1 would be good. ( still 700R-4 )
    You won't actually have performance, but you can get MPG in the mid 20s, and it'll feel much better than it really is.
    If you insist on carburetion, then you need either the '87-only LG4 intake manifold, or the Edelbrock 3706. Top with a freshly re-manufactured Q-Jet from a 1980 LG4. Set your HEI for 6 degrees initial advance, with another 28 degrees of centrifugal.
     

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