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Old 06-27-2011, 05:51 PM   #31 (permalink)
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Depends on RPM's when cruising, but probably would not help. Increasing the plenum size with a spacer would raise the torque peak. Stock 350 dual plane intakes are tuned to produce peak torque from idle-4000.

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Old 07-29-2011, 07:55 PM   #32 (permalink)
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Quote:
Originally Posted by northboundtrain View Post
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I've thought about 2-barrel carbs too, but I need to understand the theory behind why 2-barrel would be more efficient. At part throttle, isn't a 4-barrel effectively a 2-barrel with even smaller barrels? Would a 2-barrel be more efficient at WOT, but not necessarily otherwise?
I also want the ability to tow with this truck, so there may be times when I need four barrels.
Yes, 4bbs are essentially 2bbs at part throttle. Barrel size varies, spread bores have smaller primaries than square bores. From what I remember, the Q-Jet primaries are significantly smaller than the 2bbl barrels.

It's been forevah since I've driven other 4bbls, but on my Q-Jet I can feel a difference in the pedal when the secondaries are opening. The springs on the 2ndaries are fairly strong on my carb, so I can tell obviously when they're opening.

Helps keep you out of them if needed.

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