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Working on a 1978 Buick Regal Turbo 3.8L 4bbl. Looking for a vacuum diagram. Checked beforeblack.net but links are no longer in service. Any help appreciated.

Hi, I have a question about the 200-4R's that came in the late 80's Caprice cop cars. I have located one out of a '90 9C1 and was wondering they came with a more performance-geared valve body. I have not bought it yet, so I do not have it in my possession to check unfortunately. I've read that...