Thread: SBC Identification Numbers Decifer Help

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The 3970010 is a casting number for a 69-79 350 cubic inch (and also a 69 302) motor. The single letter C indicates a 57 265 OR a 58 thru 64 283. This should be really easy to sort out......could the "C" possibly have another letter or two more letters?.....but there is no two-letter code beginning with C that indicates a 350. Is the pan off? If so, if it is a 4 bolt main, you have your answer. Is the block drilled along the top edge (just under the head surface) for the plug wire looms? Does the engine have a road draft tube in the valley? Pull the pan and look....the bore will give it away.

mike in tucson

IMG_20110722_172333.jpgIMG_20110722_172418.jpgIMG_20110722_172511.jpgIMG_20110722_172432.jpgi came up with the same info, the vin id plate is as it reads im putting pics up to show exactly what i see, i did pull the passenger side exhaust to get to the date codes, i know so far its a saginaw plant motor given the clock stamp and then there is a bunch of other codes stamped in as well. hopefully the pics will help speed this along.