91 Z28: 305 to 355 Do I need new ECM?
Senior Member
Joined: May 2001
Posts: 502
Likes: 0
From: Hollywood, FL
Car: 78 Regal
Engine: 82 FBod LG4 305, 730 ECM
Transmission: M20
Axle/Gears: 4.10
It's the same ecm but a different prom, like stated before. The speed density calculation is still for a 305, among other things.
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