I came across some good info about the 273 from a guy on another site Quote :
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hello, I did some research on 273 . the 180 hp, has an 8.8 cr listed. according to the NHRA specs, which are provided by mopar are; deck hgt. - .011, a .028 gasket, 57.3 cc head will provide a cr of 9.5. the 4 bbl motor, has deck hgt of +.129, .028 gasket, 57.3 cc head, cr. is 11.5. this little motor is a very good runner. in NHRA stk, there is 273/180 motors being run. a 1965 valient with 180/273 runs 13.30,s, in a 1965 plymouth, ran 13.43 @98 mph.
I realize not everyone is into stock racing, but the fact is, these motors can be very quick. many many years ago, I ran a 235/273 dart as a stocker, plus drove it. it ran 13.31 @ 102.30 mph. some people like smaller motors, others like big motors. to each his own. .060 over is about the limit on overbore in these motors. just food for thought.
