What is the STP PN for reference ?

Looks nice.

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Auto Zone stock the STP brand. PN: SA3648 
I checked at two stores and they both came out at the same size which is about 1/16" under spec so they work. The WIX and Napa filters came in at spec so they where too big.

NICE! What did you use for the RAM-AIR base?

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Kultulz - Base is a heavy duty aluminum cookie sheet like a bakery would use (has a 1/4 dia wire rim). Shortened for this purpose - and attached to the oval air cleaner base with stainless screws and nylon stand-offs. Spent time carving clearance for everything around the carb. The seal foam is a Moroso scoop kit carefully cut to match the hood (with my wife's electric kitchen knife........shusssh). I have a couple of other oval cover tops that I change on a whim - along with several sets of valve covers. A fellow I met here in Tucson has a Y block powered '56 truck and every time I would run across it - the engine would be dressed differently. I had to ask what was up and he just grinned, said he has about 12 different set-ups and changes for every show! Easily possible with the Y and kind of fun to collect up the stuff to do it.

Tried the cold air pan out with a pair of thermocouples I have - and it really drops the air intake temperature a lot versus the other open element air cleaners like the '57 I have. Holley used to publish a value of 1HP increase per 10º F of intake air drop. It will do a big drop even when the temp here is 105+. In the fall and winter almost too much. I haven't tried a manometer on it - but MikeR says it should build a bit of pressure as well.

 
 Steve Metzger       Tucson, Arizona

It really looks nice and yes, the system does work (refer to 1968 F/L and MUST RAM-AIR.

One question, I am guessing you don't drive it in bad weather. If so, any problem with water ingestion?

The open ACL cut down on flow restriction but did suck hot engine compartment air. Yours is slick and unseen.

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