LT1-LT4 Modifications 1993-97 Gen II Small Block V8

3.4 to lt1 swap

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Old 05-20-2010, 06:12 PM
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what is the difference between a 94 and 95 harness?

and how should i program the ecm seeing how i am chnging everything in the motor from the heads to the rotating assembly to the intake and the exhaust manifold.

i am also wondering about accel's digital ignition system (49324) is this a stand-alone system? or does it work in conjunction with the stock ECM?

i guess this is a stupid question but i need to know my options for the ignition system
Old 05-20-2010, 09:46 PM
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The 94 harness had a different part number and it was discontinued. I think your best bet would be a stand alone system. I know summit sells a painless wiring set up. I would check that out and as far as the accel system im not sure
Old 05-21-2010, 11:21 AM
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ok so i am told that i must get a 96 and up ecu if i want to be able to program it. will that work with a 94 lt1? also keeping in mind that this lt1 is out of a CAPRICE, will a camaro harness work? im not sure what to shop for.... a caprice harness or camaro harness
Old 09-02-2018, 10:57 PM
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So I’m planning on doing a LT swap on my 3.4, any idea if the ECM would work into my firebird?? Also, will my dash gauges and everything work still? Speedometer RPM?
Old 11-11-2018, 08:21 AM
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Originally Posted by Erik Chafin
So I’m planning on doing a LT swap on my 3.4, any idea if the ECM would work into my firebird?? Also, will my dash gauges and everything work still? Speedometer RPM?
you need an lt ecm, preferably from the same year. You also need a new cluster for everything to operate correctly.



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