Subjects>Auto>American Cars

Swapped a 350 into a 87 Chevy that originally had a 305 do you need to change the ECM for a 350 or will it work?

Anonymous

∙ 17y ago

Updated: 9/13/2023

might run lean? you could try it and check your plugs or if you hear pinging good sign running lean . if it is mass air set up should compensate for change if speed density will not and need to change ecm or get reflashed

Wiki User

∙ 17y ago

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