Re: GM Engine ID...
Tom, GM seems to use an alpha prefix for their RPO options then and still to this day. "A" are usually power options, seat, window, seats, etc. "B" are molding options, "C" heating and cooling, "D" stripe and decal packages. Of course "M" are transmission options and "L" engine options. I could go on and on but I think you get the idea.
I've worked in the parts department at a GM dealer for 29 years. GM used to send out little booklets every couple of years that listed what all the RPO codes were. That was before computers became common. Now we just type in the Vin # and it brings up all the options the vehicle was built with. I hope this helped....Troy
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70 Chevelle Vert L34 M21 28-A 791
70 Chevelle Cpe LS6 M40 14-14 756
70 Chevelle Cpe L?? M?? 926-99616 755
69 Chevelle Cpe L78 M21 71-B 756
70 Chevelle Cpe L34 M20 48-48 796
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