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91 5.7L TBI on sbc 400

Discussion in 'The Garage' started by strokin13, Aug 31, 2005.

  1. strokin13

    strokin13 Newbie

    Aug 31, 2005
    Likes Received:
    Fargo, ND
    I am building a 400 small block to put in my 72 blazer.

    I have heads, intake, distributor, TBI, ECM, and wiring harness, accessories, brackets, and serpentine from a 91 chevy 5.7L that I am going to put on the 400 block. The 400 will otherwise be stock.

    Can anyone give me some insight as to problems I may encounter? I have been told I could run into problems with compression and timing etc. But on the other hand I have been told this is an easy build that will give me gobbs of torque. Any insight would be helpful!
  2. dyeager535

    dyeager535 1 ton status Premium Member

    Dec 13, 2000
    Likes Received:
    Roy WA
    Timing will be wrong, knock sensor signal will likely be wrong, and fueling to name a couple.

    I don't know if the stock 350 TBI injectors can handle fueling a 400, I suspect if it IS mild, they can. If you go lean under heavy load, you'll know shortly when you hole a piston. There are some references to the WOT lean problem with 383's on this board.

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