I have a mystery! (at least to me ) The VIN of my '66 Newport 5th digit is a G. According to the service manual that means it has a 413. If it had a 383 it would be F and a 440 would be J. Everything I've read so far states Newports didn't have the 413 as an option. The car has air conditioning so I can't see the stamp on the engine block. Thanks for any info you folks could help me with!