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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?
Wiki User
∙ 15y ago
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
∙ 15y ago
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