motor size
5 Answers
I tried to provide a pic not sure how to upload to you
https://firstgenfirebird.org/1967-info/1967-technical-information/1967-drivetrain-id-number-information/
I thought the transition to the 400 from the 389 and the 326 to the 350 occurred in the 1968 model year. Are you certain you have a 400 in the 67 as the original engine?
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There were only a few engine options in the 1967 Firebird. The 400, 326 and the OHC 6. There were performance options for each engine.