Carbureted engine swap

Discussion in 'Engine & Performance' started by Redneckfarmer97, Nov 20, 2016.

Which option should I choose?

  1. Rebuild and build my 350 TBI

    0 vote(s)
    0.0%
  2. Drop in a built 400 small block

    100.0%
Sponsored By: Black Bear Performance
  1. Redneckfarmer97

    Redneckfarmer97 New Member

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    Hey guys, I'm new to any sort of forum so forgive me if I am posting in the wrong place. I have a 1989 Chevy C2500 with a 5 speed manual. This winter I would like to do one of two things, either rebuild and cam my 350 TBI, or swap in a 400 small block. So my questions are, if I cam a 350 TBI, will I need to do anything to my trucks computer? And if I drop in a 400 small block, what would I need to do with my computer? Also, what else would I have to do if I dropped a carbureted engine into a truck that is powered by a TBI engine? As you can see I'm not very experienced in dealing with vehicle computers. I am only a novice mechanic who is thirsty for knowledge! Any input with either option would be greatly appreciated! Thank you!
     
  2. oldschoolchevy

    oldschoolchevy Serious!

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    I would ditch the idea of a 400 sbc an just swap it LS block an ECM. Way better power capabilities and fuel mileage. Depending on your area you can get a engine an ecm also harness for 400-800.
     
  3. Redneckfarmer97

    Redneckfarmer97 New Member

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    While I think the LS engines are badass, I have a soft spot in my heart for old carbureted engines. This is for my second truck, or as I call it, my "fun truck", so I have no worries about about fuel mileage. In the time since I've posted my question, I have decided to just rebuild, then build my old TBI. I won't have the money for a 400 sbc, and pets for the 350 are relatively cheap. Will I need to do anything with the computer if I cam it? Also, what cam would be recommended? Thank you for the feedback!
     
  4. Setbrew45

    Setbrew45 New Member

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    I'm working on building my 350 TBI everything I've read says that you'd be better off going carbureted nut I have yet to find somebody to help me on the wiring lol
     
  5. Hogg

    Hogg GMFS Member

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    I'd snatch a $2000 brand new 2 bolt or 4 bolt Vortec 350, install a TBI/Vortec intake and away you go. Would easily out power the stock 400.

    Part number 12530282 2 bolt

    Part number 12530283 4 bolt


    The Vortec heads are the highest flowing heads GM ever installed on a GEN 1 SBC.

    That being said, the basic GEN 3 LM7 HO will pull 360hp with its lame stock LS1 camshaft. Makes all the drama of the 365hp L76 327 of the mid 60's seem kinda silly.

    peace
    Hog
     

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