S Skids New Member Joined Jan 8, 2006 May 20, 2007 #1 Are stock turbo heads and stock NA 3.8 buick heads with the same casting number (8446) identical??? Are there any valvetrain differences?
Are stock turbo heads and stock NA 3.8 buick heads with the same casting number (8446) identical??? Are there any valvetrain differences?
