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Old 04-02-2008, 08:39 AM   #1
chevydude89
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Join Date: Jul 2007
Location: San Jose CA
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305 tbi to 454 tbi swap

I have a 89 chevy truck. it has a 305 tbi engine and 700r4 auto tranny and I would like to swap it with a 1992 454 tbi and 4l80 auto tranny. I would like to know what parts are interchangeable? would I need a different fuel pump and need a new ECM or would the 305 ECM work with the 454? also would I need the wire harness from the 454 truck? any help will be greatly appreciated.
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Old 05-24-2008, 07:25 AM   #2
extd56
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Re: 305 tbi to 454 tbi swap

You will need the computer and the wiring harness for the big block with the 4L80E. The best bet is to get them from the donor vehicle.
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