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Hi, I am trying to find out if I have a 327 block or a 307. The casting number is 3914638 (june 25 1968). I have gone to mortec.com , nastyz28.com , 1vehicleidentificationnumber.com , and classictruckshop.com . The first three sites say it's a 327, and the last says it's a 307. I have measured the bore and it is 3.915 (the pistons say .040) which means it used to be 3.875 (which is 307 size). Did all 327's have 4'' bore? Any help would be appreciated. Thanks
 
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