1965 Chevelle 300, 396/425 M22 COPO

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fsc66 · #38 11-23-2021, 04:03 PM

I asked Jeff Helms about the IY code listed in Alan Colvin's book and why it listed the engine as a 396/375 HP motor.
From Jeff: "When Alan wrote the book he did not have the COPO sheets from Tonawanda yet that explained the engine was a 396/425 and how to build it, so it remains correct as a 396/425 motor. Someone out there has the specifics on the COPO build, I'm sure we'd all love to see

Also, perhaps someone has information on the engine past number listed; 3888819 or the other COPO motor listed above this one, COPO 9557: 3882847?
Paul

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PeteLeathersac (11-27-2021)

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