305TransAm-84

I have an 14" aftermarket open air airfilter with drop base (ca 1/2"). Heigth is 2". I think 2" is too little, and will raise it to hood limit (Performer Rpm manifold)

2,5" heigth is ok (max 3") and I found airfilter from Fram CA 342 and Purolator A 60102. But they are too thick. They dont fit inside airfilter-housin They are O.D. minus I.D. (13,91" minus 11.63") = 2,28" thick.

Because of the drop base, airfilter-thickness would be max 1,3". Where can I find this? Someone that knew the partnumber?

Since I live in Europe I have to try the most know trademarks like Fram, Purolator, AC Delco.......

Damon

Let me guess..... the ID of the filter kinda "rides up" the drop base angle a little and the filter won't drop all the way into the base, right? I just kinda "forced" mine a little (Purolator). It was annoying to me too, but it works just fine.

A K&N air filter will fit much better- they're just spec'ed a little different and they usually fit typical open element housings better than typical paper replacement filters. They make them in increments of 1/4" in height. I would never use anything smaller than a 2-1/2" filter in a drop-base air cleaner.

305TransAm-84

Yes. That is correct. The drop base (about 0,8") make it difficult/impossible. I prefer not to squeeze the filter....(destroy it?)

The 2"- filter I have today is totally unmarked, so anyway it is impossible to find an identical filter.

What Purolator filter did you try (partnr.)?

At www.knfilter.com I found a KN-filter that fits perfekt. Partnr is E 3735. They are expensive (120$) and is a longtime-order.
So isnt there any other firm that manufacture a proper filter??

Air_Adam

Heres my 14x3 drop base air cleaner. Fits fine under the stock hood, and its got a Holley and a hi-rise intake under it.

305TransAm-84

Nice. I bet you have filterelement EDL 1217 there. How thick is the airfilter/inner diameter? Does it fit in dop base? How deep is the drop base in housing?
www.summitracing.com sells that filter for only 8,95$. But shipping/handling fell/toll make it to 100$ to me
I will try to see if a dealer in Norway have that filter...

305TransAm-84

Air_Adam:

You have a Camaro...? Dont they have a higher hood than mine Firebird? Perhaps 3" is too high filter?

Air_Adam

I do have a Camaro, and I think you are right, the Camaro hood is a bit taller than the Firebird hood.

The air cleaner is a drop-base, prolly about 1" or so. The filter is just whatever came with it when I bought it.

Tobias05

I'm running the same exact thing as air adam... high rise intake and that edelbrock drop base. mine fits too...camaro of course

later,
brandon

meeklay812

I currently have an edelbrock RPM manifold and when i did my 305 to 350 swap, I used a 14x3 drop base. If you get level with the car, it looked like it wasnt gonna even be close to closing. I had to take the insulator off the top of the hood, but it shuts fine now...

305TransAm-84

Ok. So its fits Camaros.
But what about my -84 Firebird when it comes to clearance under the hood? Does a 3" airfilter fit under it? It is difficult to decide when looking thru the airoutlet at the hood.

I have:
Performance Rpm intake.

Dropbase aircleaner housing (how much dropbase do you have if it fits under your hood?)

No insulation under the hood (Another question: Is insulation standard? There was nothing insulation on my car when I bougth it used)

meeklay812

Can't help ya with the fitting under the Trans am hood, hope all goes well for ya... I know it caused me some stress

As far as my drop base, mine was the edelbrock pro-flow part number 1207...

350-1207
14'' Diameter, with 3'' Tall Element
Edelbrock triple chrome-plated round air cleaners work with all popular 5-1/8'' diameter carburetors (Performer Series, Holley, Thermoquad, Quadrajet and Carter AFB). Has knock-outs in the air cleaner base and include an adapter for crankcase ventilation. #350-1207 fits Edelbrock, electric choke and Q-Jet carbs with spacer #350-8092 and fits Edelbrock manual choke carbs with banjo fitting #350-8089. Height of air cleaner is 3-5/16'' to the top of the supplied retaining nut.

I dunno if that helps, good luck!!

305Tiger

...I've got a 10x2 drop on filter on my stock 87 T/A with an LG4 305, and very unfortunately, the owner before me had to cut out a circle on the underhood fabric so that the hood would close. I've tried getting a 3inch filter on there, but lets just say that thats not happening anytime soon!
-G

blackbeauty

A friend of mine has a 327 in his 82 with an RPM performer and Holley 600 and the 82 cowl hood on the car (without insulation). He uses a 14x2 drop base air filter and it all fits under the bonnet - just. I think it's 14x2, 14x3 seems large. I don't know how much the drop base is though. At

However, a flat Firebird bonnet does have problems, it crushes the front of the air filter a little bit.

305TransAm-84

Ahhh....I finally recieved the 14x3 openair-filter I ordered. And I mounted it.
But the hood didnt close It hit the filter at the front just when the clearance at the front of the hood was 1,5-2 inches. Pitty.

I have no insulation under the hood. I can see that if I cut away some of the steel-arm under the hood, it will fit. Cutting steel areal will be about 3"quad.

Can you recommend that? Will it make any problems? Stiffness in hood will still be OK?

Chickenman35

You need to run a minimum of a 3" air cleaner on a drop base filter, no if ands or buts. 4" is better. 4.5" or 5" is best.

Your choices are:

1: Install a Hood Scoop or glass hood with scoop. Best choice IMHO

2: Remove intake manifold and mill 1" off of manifold. Performer RPM's have enough material on them to do this. Have machine shop check manifold though to be sure. Mill enough off so that you can fit a minimum of a 1\4" phenolic spacer ( 4 hole ) under the carb to isolate heat. 1\2 spacer better if you have room.

BTW, Moroso unit has best top design for low air horn clearnace issues.

305TransAm-84

So, is it recommendable to cut with steel-scissor in the armour-plate/arm at the underside of the hood....? I know it is a backyard-solution, but no one can see it . And it is the cheapest..

Chickenman35

That may be more difficult than it appear as these re-inforcements are usually held on with strutural adhesive....which is danged strong. Not having seen the underside of a Poncho hood in a long time, I can't say how difficult it would be, but if you can somehow remove the sections intact that may be best. Then you could reattach them with structural adhesive, spaced farther apart to to clear the air cleaner.

Alternate method would be to remove the hood, buy or rent an air cutoff tool and remove ONLY the sections that actually hit the air cleaner. Forget about the steel scissors or Tin Snips. Ain't gona cut the " mustard " so to speak. Try and leave as much of the strengthening ribs as possible.

cam-

Interesting. Do you know if there is much horsepower loss with milling the RPM intake down?

Chickenman35

Less than having a restrictive air cleaner

MrDude_1

first off, the most common 14" element height you see is 3".

heres another option..
get a drop base and a 3" element.

then, try to close the hood... the forward part is probly where its going to hit.

the top and bottom of the filter housing is just sheetmetal..

bend it (equally on both peices) so it clears...

the filter is just rubber seals, and steel mesh supporting paper.
with the housing bent slightly, you can tighten it to form into the proper shape.

between that and removal of the padding under the hood, it clears.

Chickenman35

Dude...read all his posts. He's done all that and he's got a Trans-Am. They have less hood clearance than a Camaro. And he doesn't want to bend the Air Cleaner ( Don't blame him )...would probably require much more of a bend than Camaro.

MrDude_1

i know that, and ive done it before..

if he doesnt want to bend the air cleaner, i can understand.... the only ones ive done that to were cheapie MrGasket "Daytona" ones.... but it works.. its a option so its out there.

305TransAm-84

Hi guys!

Sorry for long time -no see.

I have cut a bit of the underhood steel-arms/reinforcement with a steelscissor.
The hood close fine now Some fineadjustments and clearance-checking will be done soon.
It was only about 3"quad I had to cut away. To me it looks like that was the best, easiest and lowcost solution.

F-BIRD'88

If you want to use a Performer Rpm manifold under the stock hood of a Fbody you have to use the right air cleaner
allows a 14x3" element with room to spare.

Search my posts, its all there. keyword: L-88


Need to do a sticky on this as it always seems to come up.

This is my firebird with a GM L-88/L72 14x 3" air flilter.
Fits holley, edelbrock and rochester with a few mods.

F-BIRD'88

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