/6 in a sm block car

Found this on the /6 Forum;
The "PT 225 R 24670034" is the engine number, and not the car's VIN. It decodes as :
PT = Trenton engine Plant
225 = 225-cid
R = regular gas
2467 = Engine assembled April 29, 1968
0034 = 34th engine built that day

Not all engines and transmissions had the VIN stamped on them, although those that did were built after January 1, 1968, from what I have been able to determine.

The car's VIN is usually stamped on the right side of the block, just below the head under the #6 cylinder. It may not be a full VIN, just the last eight digits. It will be a machined boss (ie, a piece of nice, smooth iron) with digits stamped into it, just like the location where you found "PT 225 R 24670034".