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Old 09-08-2017, 07:47 AM   #5
Keith Seymore
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Join Date: May 2009
Location: Motor City
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Re: 1987 GMC Truck RPO Codes

Originally Posted by mongocanfly View Post
I don't mean to dominate the thread, but a couple comments about the generic online RPO decoders:

a) The RPO codes get reused, so if the decoder is looking for the modern usage of the code you can get messed up. For example, an LS6 today (GenIII small block) is not the same as an LS6 from 1970 (450HP big block).

b) Not all RPOs are included; in the decoder above YG1 is not shown.

So it's usually better if the person can find contemporary literature which includes the RPO codes from the era in question.

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