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I'm looking to put a 200-4r into my '70 velle. I hear this is THE place to go for information on 200-4r's. I do understand what is involved with the install so I currently don't need help there. I need to know how to identify a 200-4r, and what to look for to tell if it came out of a GN or...

A good friend of mine bought a '87 GN with 30k miles on it. It's completly stock. Him and I know little about GN's. There is a noise that sounds like a sheetmetal clanging when the car is at full throttle and at high boost. Was told this might be detonation. Is this a common problem with a...