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Thread: '80 Corvette 350 4 spd M/T, '93 TBI, '94 454 TB, 7427 PCM

  1. #16
    Electronic Ignition!
    Join Date
    May 2016
    Age
    54
    Posts
    11

    tbi swap

    I did a tbi 625 ecm swap on my 79 vette a few months ago. It has a thm350 trans right now till i install the 4l60e . Runs good. I did fuel and timing with the trans harness tied to the side for now. Pretty much a stock motor, gm rebuild installed by previous owner. 93 pickup was the doner for the fi system and trans.

  2. #17
    Fuel Injected! Loyd's Avatar
    Join Date
    Jun 2014
    Location
    Vermont
    Age
    75
    Posts
    34
    make sure the holes in the adapter (tbi 2 carb) are the same size as the tbi you are using. if mismatched can cause a very hard to find vacuum leak. also check the length of the tbi hold down bolts. the stock ones may be a bit too long. good luck

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