[racer_x_76]

From what I've seen of both 2bbl and 4bbl there isn't much in the way of differences. As far as I know they use the same valve sizes, same spring diameters. Combustion chamber size is the only difference I can think of. Unless you have a set of "K" code heads they're all pretty much the same.

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Current projects: 65 Fastback, 68 Coupe Oval Track Racer, 64 Galaxie 500 XL, 54 F-100 Pickup