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Thread: Improve the TBI 454 or go 8.1?

  1. #1

    Improve the TBI 454 or go 8.1?

    I have a 89 GMC Dually with a stock TBI 7.4. It does have headers but would I be better off changing the heads and intake to a 049s I have that are ported with big valves and maybe a camshaft and stay TBI or I also have a 8.1 complete with a 4L80E that I can get a harness from Nordstrom for 875.00 to run it all. Thanks!

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Dec 2004
    austin texas
    dont waste ur time or money on improving a tbi, put the 8.1 in

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