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Old 01-16-2016, 04:50 PM
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WILMASBOYL78 WILMASBOYL78 is offline
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Default GM Engine ID...

What does the "L" in L78 stand for??? I notice all GM engines seem to have an "L"....and is there any method to the numerals like "78" or is it just by chance??

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Old 01-17-2016, 02:14 PM
BLACKLS5 BLACKLS5 is online now
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Default Re: GM Engine ID...

Tom, GM seems to use an alpha prefix for their RPO options then and still to this day. &quot;A&quot; are usually power options, seat, window, seats, etc. &quot;B&quot; are molding options, &quot;C&quot; heating and cooling, &quot;D&quot; stripe and decal packages. Of course &quot;M&quot; are transmission options and &quot;L&quot; 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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Old 01-22-2016, 08:46 PM
Kurt S Kurt S is offline
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Default Re: GM Engine ID...

I once heard the L originated for Locomotion. There was some historical info to back that up, but it was many years ago. I don't recall the origins of the M, but it was in that same article.
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