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Pedal,
If you've seen websites quoting 365hp, I would like to know what they are. I would like to see what you are seeing. That might lead to a better understanding.
Factory compression was 8.5:1 across the board in '71, even in the W30 high performance engine. Engines build up carbon over the years, increasing compression. Maybe that is why yours is testing at 10:1.
It is very possible that the package your car has was installed by a dealer, or a regional or local dealer marketing group. In that case, without documentation, you really don't have anything to go on.
It is also possible that someone went to alot of trouble and expense to have decals and emblems made up because they wanted the car to be different, or because that is what they liked. The graphics are not hard to do. Most sign painters or stripe places can do that stuff. The emblems are a different story. They would almost have at be cast of something - either plastic or metal. A mold would have to be created. That's a lot of expense and work to make 3 emblems to put on one car. Now, if there's another GM car out there that for some reason used emblems that said L31, problem solved.
Do you have the ability to scan the buildsheet you have?
Paul
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