http://www.gnttype.org/general/v6hist.html
That link provides a bunch of casting numbers for the Buick V6's. It shows the same casting number used with the 3.8L (231) and the 4.1L (252) engines. Most people will agree that the casting number ending in 8445 is the best flowing head for these engines from the factory. Also the same heads were used on the naturally aspirated engines and the turbo engines. So I would feel completely comfortable bumping up the compression ratio. These engines have a huge following between the turbo engines and the Jeep fans. Tons of info on them available at www.turbobuick.com and www.gnttype.org.
Project car + budget = headache.
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