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  1. #1
    thesepaperwings's Avatar
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    Can someone tell be why these carbs are different?

    I have two different carbs, both off of pp 440s. They have different fuel delivery methods and I want to know why. Is one better then the other? One has choke removed and primer but that is not what I'm talking about. Also, is there any way to tell the jet bore of a bn carb? I know they don't have replacable jets but I was thinking maybe the 550 would be drilled out bigger and wanted to make sure a 550 carb wasn't tossed on before I got it.
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  2. #2
    thesepaperwings's Avatar
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    Nobody???

  3. #3
    The spicket carb if I remember right is off a 1977 440 and the flange mount is a later model carb. The one carb has been bored all the way through to make it a true 38 mm where the other one is still stock. The bored one will flow more fuel for top end but the stock carb will have better low end. Your best bet for performance is a 1986 -1991 550 carb which is a 44mm carb with the intake will bolt right on. To measure the carb do it on the intake manifold side.

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