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Fuel systems Q&A Carbs, injection, tanks, lines, pumps, everything fuel system related!

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Old 05-12-2019, 01:00 PM
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skull skull is offline
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it should not make much of a difference if the intake is a dual plane, fuel still goes thru the manifold pretty much in the same way with the spacer moving the carb up, l think it looks cool with the spacer.

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Old 05-13-2019, 10:44 AM
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05snopro440 05snopro440 is offline
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We usually use a 1/2" or 1" phenolic spacer under a heat shield to reduce heat transfer to the carb, then put the carb on top. I don't think that 2" spacer will help drivability but it might not make a big noticeable difference.
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Old 05-13-2019, 09:30 PM
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Old 05-28-2019, 10:27 PM
BlueNorther BlueNorther is offline
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if it is a 4 hole spacer, you might gain a few lbs-ft of low end torque, if it is 1 big square hole it will kill a s___t load of low rpm torque but may give you a little higher top rpm.

the only reason to run a 2" 1 hole spacer is if you are class restricted to a very small cfm carb, the big open plenum will act as a reservoir of fuel mixture so there is less restriction for each cylinder to draw from. this is why you don't see them on the street.
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