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I have been battling a knock under boost problem (trial and error) a 1986 GN for the last two seasons. I have performed a ton of research, reading just about every knock related thread on the site. I have tried several commonsense approaches based on the information I have read with no luck, I...

Can anyone tell me if my rear brakes have been upgraded? The rear shoe lining is 11 1/4 inches long and the f ront shoe is 8 inches long.

3 years ago I purchased a 86 GN and just got it out of the garage last week. I bought the car blind. The motor would not idle and ran rough at low RPM. The motor had an extra fuel injector attached to the throttle body and wires and relays that I new was not stock. Extra wires went to the gas...

Hi, I am new to the site but I have been a GN owner for 3 years. I have made several expensive mistakes from a lack of experience. Would someone tell me what kind of rear lower suspension arm bracket I have? Is it stock? I went to a Buick Nationals last weekend and looked under every car, the...