How much horsepower will a 3" by 15" open air cleaner on a 4bbl. carb give me??

 

87,

That's a pretty loaded question. A lot depends on what mods you've already done, and just how much restriction the current air cleaner assembly presents.

If you have a single small snorkel air cleaner, an open element will probably gain you some performance. If you have a dual snorkel air cleaner, the gains may not be evident, and teh warmer air drawn from directly over the engine may cost you a little aid density and fuel charge. A dual snorkel with intake ducts seems to be a good setup for a 4BBL.

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Later,
Vader
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"I'm'a do Things My Way - It's My way or the Highway."
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I'm with Vader on this one. I bought a dual snorkel that had been partially gutted, so I finished the job; no thermacs, no backfire ring, no inner deflectors, just the bowl plus K&N. Then I put my turbo bulge aircleaner lid on the dual snorkel, took the door out of the hood's airbox, so now I have three sizeable cold air inlets. Gained just shy of a 1/2 second out of all that. Dual snorkels work for carb motors.

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DR Stevens
Car #1: my ride
1984 TransAm
305HO(L69) 96K & counting
750 cfm Q-Jet reman. by Holley
K&N filter
700R4/Superior shift-kit
and trans cooler
3.42 rear/3.73 blew up!!
underdrive pulleys
Accel HEI Super-Coil
180 stat/hi flow water
pump/Jet fan switch
dual snorkel /w/ hood louver
3" exhaust of some sort
partial emissions delete
Stock-appearing radio /w/
10-disc changer
Car #2: My wife's ride
1991 Firebird/Formula
305TBI(LO3) 99K & smoking
K&N air filter
Hypertech Thermomaster Chip
more engine mods later
400W amp /w/ 12" sub
"Hey, Uncle Sam!! Where's my f**king tax return??!!"