slantsixdan
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slantsixdan I haven't had time to look at the engines agsin but I will this weekend. my understanding is that the casting number is on the drivers side of the engine. are there numbers somewhere else I should look for?
Yes. The casting number is on the manifold side of the block, but what you want to find is the numbers and letters stamped on an extension of the block deck (facing the sky), below and outboard of the frontmost spark plug, just inboard of the base of the alternator/coil bracket. You will probably have to clean away some grease and grime to read the stamping.