Bryan,
Maybe you already know about these but here are a number of reports you can
get from the Internet on NACA scoop design.  The first one does not relate
directly to NACA scoops as such, but provides a broad introduction to the
general topic of air inlet and outlet performance.  Good luck.

NACA Report No. 713, Internal Flow System for Aircraft; Rogallo. 1940.

NACA Advance Confidential Report No. 5120, An Experimental Investigation of
NACA Submerged-Duct Entrances. Frick et al. 1945.

NACA Research Memorandum No. A8B16. An Experimental Investigation of NACA
Submerged Inlets at High Subsonic Speeds. I -- Inlets Forward of the Wing
Leading Edge. Hall and Barclay. 1948.

NACA Research Memorandum No. A8F21. An Experimental Investigation at Large
Scale of Several Configurations of an NACA Submerged Air Intake. Martin and
Holzhauser. 1948.

NACA Research Memorandum No. A5OE02. Pressure-distribution and Ram-recovery
Characteristics of NACA Submerged Inlets at High Subsonic Speeds. Frank.
1950.

Danny Miller
N 38° 43' 25.7"
W 77° 30' 38.6"

-----Original Message-----
From: Bryan Wullner [mailto:vonjet@gmail.com]
Sent: Thursday, April 28, 2011 2:37 PM
To: lml@lancaironline.net
Subject: Premolded NACA scoop

Does anyone have or know where I can get a NACA scoop to install on my
cowling for oil cooling?
I tried lancair and looks like the only have the small ones now. I looked at
aircraft spruce and they have some but they outlet is 2.5 to 4 inches. I was
looking for one with a 3 inch duct connection and proper size for cooling
the oil.
Thanks
Bryan