Hi Sammy,, Bore first , then Stroke..

228,,,,, 3 9/16,,,,, 3 13/16

248,,,,, 3 23/32,,,,, 3 13/16

270,,,,, 3 25/32,,,,, 4

I believe the 302 to be the same stroke as a 270 but a bigger bore. I think it is 4 and 4, someone else will have to chime in with the 302 info. Those specs are not in my book..

What are you building ?

Bill M
53 GMC Hydra-Matic

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