Building An Electric Fan shroud

So, here is my "custom" '68 Big Block Mustang Electric Fan Shroud.   It's an updated reproduction shroud from NPD with two 12" Maradyne fans (1,565 cfm each) and 4 one way pressure vents. 

A shot from the inside:

The inner fan sits right at the core, the outer fan draws from around the rest of the core.  Between the two, and all the extra sealing I did, it should maintain about 3,000 cfm total. The pressure vents are made from the '66 battery terminal insulators that originally mounted on the inner fender wall next to the battery.  

Because of the serpentine setup from the 5.0, the '67 radiator support, and the three inch thick Griffin radiator, space for a fan system was really tight.  I want to keep a low profile on the modifications, and noticed how thin the stock '68 fan shroud is.  So I cut up the stock shroud. bonded on a piece of 1/8" aluminum plate, and closed the area to just the core for max efficiency.  Then used closed cell foam tape to close up the air gaps.

The Maradyne fans are as good as they get (these guys do NASCAR stuff).  They are just over 3" thick, draw some major air, and are fairly quiet.   Here is a picture of the whole package installed. 

Tight quarters no doubt!  There is a minimum of 3/8" clearance between the fan motors and pulleys / belts.  So no worries about rubbing.   From the front it looks stock.  And that is what I was looking for. 

In the picture below, you are looking at a '66 Mustang, with a '67 radiator support blended in.  A '68 Mustang Big block radiator (actually a Griffin Big Block aluminum version), with  '67 / '68 mounting hardware, a '68 shroud with a concours correct "Caution Fan" sticker. 

It was a really fun project.  The fans will get their signal from the ECU, so they cut out during full throttle passes.  This also allows me to program the on and off temperatures.  As a back up, I have installed a temperature switch at the rear of the intake manifold, that can be hooked up to the ground side of the relay.