I 100% agree with barnbird. Also, I have a 400 HO with a YW engine (and from the factory it has the long branch manifolds to help with the horsepower) that is numbers matching to confirm this data.
Last edited by Tom68Firebird; 05/22/2109:51 AM.
1968 Pontiac Firebird 400 Convertible - April Gold/Deluxe Black Automatic 1968 Pontiac Firebird 400 Coupe - Aegena Blue/Standard Teal 4 speed 1968 Pontiac Firebird 400 H.O. Convertible - Alpine Blue/Deluxe Teal Automatic 1968 Pontiac Firebird 400 Coupe - Autumn Bronze/Deluxe White 4 speed
