Question on ECM Interchangeability

08-24-2017, 12:58 PM

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Car: 1991 Camaro RS yellow

Engine: was '91 V6, now '89 5.7/355 TPI

Transmission: 4 speed automatic

Axle/Gears: Moser 3.73 with zexel posi

Question on ECM Interchangeability

Are ECMs on all Chevys from 1986 to 1992 the same regardless of engine size and model? Are they interchangeable?

08-24-2017, 01:53 PM

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Car: 1967 Camaro, 91 z28

Engine: Lb9

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Re: Question on ECM Interchangeability

Only if they have the same service number and correct calibrator.

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