we ran a lot of 283+.60 that makes it 292 cid another vary popular was 4 inch 283 makes 301 a good set of heads and cam and about 12to 1 compression they made a lot of power that was back in the late 50s and early 60s before 327s were plentiful btw 327+60=332 and plus1/8 is 339 first record we got el mirage with the Studebaker 159 mph and at bonneville 171mph with a 339cid small block that I built that was 1966 I think ....ted