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Old 09-11-2008, 09:51 PM
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Air Filter Recommendation

Hello guys. I need an air filter to top off my rebuilt 350, and I am not sure what type/size to get. The motor is a 350 that has the following;
Holley 750 carb with vac secondaries;
Edelbrock RPM air gap intake manifold;
Iron heads last 3 numbers of casting number 491, 1.94I, !.5E, 76cc CC. I matched the gaskets to runners and did a basic port and polish on the heads.
Compression ratio is approximately 9.9:1;
6 inch rods;
Solid cam, 503 lift E, 493 lift I;
Harland Sharp Roller Rockers;
Double Roller Timing Chain;
New Scat crank;
I know this is more information than probably needed, I like talking about my engine. Anyway, the primary jets are number 72. I also know that the heads have to go. Its my first motor, and well you live and you learn.

I want a filter that will flow enough air for this present setup, and also if I decide to upgrade the heads later on. I know some of those K&N X - Stream can put you back about 150. They are nice, but I can't foot the bill for it. I always like the way a shiny velocity stack looked sitting in top of a big 4 barrel, but I don't want a bunch of debris going down the carb. The car is driven on the street for the most part with and occasional race here and there.

Any recommendations, or direction would be greatly appreciated.

Rob D.

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Old 09-11-2008, 09:54 PM
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For me, I've been the K&N route and the foam Accel route too. After doing a LOT of reading, i'm back to a good paper element inside a shiny chrome housing. Purolator still makes a 14" by 3 and 4" tall element. So does Fram. For me, it's paper all the way!
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Old 09-12-2008, 08:42 AM
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Don't be roped into believing all the K&N hype, they are not very good filters for a street engine. A high quality paper element filter is all you need. Of course they do not look as cool as a K&N, but they cost a whole bunch less. If you are intent on getting a costly reusable air filter element than consider the Amsoil filter. It is oiled foam versus K&N's oil gauze. The oiled foam has far more surface area than oiled gauze.

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Old 09-12-2008, 08:56 AM
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Go HERE and read all of the info an test results. Then decide for yourself.
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Old 09-15-2008, 01:47 AM
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A 350 Chevy needs minimum 100 square inches of filter area. A 14 x 3 filter is 131.9 square inches.
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Old 09-15-2008, 09:50 AM
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rig your vacuum guage so that you can read it while driving to read the actual WOT Hg.....

most carbs perform best and make max WOT HP with .5Hg to 1.5Hg (you don't want "0"Hg)....

your driving test with a decent flow stock paper element will indicate if you need bigger/smaller/less pleats/more pleats.....

also consider this, some car combo's will be alot quicker 60' times with as much as 3Hg WOT for more TQ (and have quickest possible overall ET)...
a "test and tune day" at the strip will prove out that case

a favorite quote (from Max Keith, a member):
"a whole lot more gooder is not necessarily more good!!!!"

the key word on the performance filter sites is "may" increase the HP...
the vac guage road test can/will indicate what you "might" gain depending on the particular brand and size paper filter you are using
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