--- You lost me Ed.  The page you listed shows a perfect solution, part number 911AN16, but I'm sure this won't have the correct bolt pattern.  I just took my pump housing down to the local race shop, and watched the poot guy try to match it with every housing on the shelf.  This would certainly cover all the common applications.  I sent an email to CSI, with the bolt pattern, so we'll see if they can come up with anything.  What didn't I understand about your post :-) 

**** Well, if you say so, Rusty.  I was surprised to find that the fitting for a Chevy engine fit my 2 bolt thermostat housing, but if fit it just fine.  If you have a later engine with a 3 bolt hold pattern then, you are correct it won't fit.

 

Ed

     Also, the 1986 water pump inlet tube is just the right inside diameter that you can use an AN16 or JCS tap and cut threads inside the tube.  Then you can screw a AN16/AN16 adapter into the water pump inlet tube (with a soft aluminum washer around the AN16 fitting.  That way you end up with two AN16 fittings on each end of your pump.  You might be able to rent such a tap, however they tend to use a JCS designation instead of AN.  I borrowed one from old man Lou Ross and don't have one myslef which is why I don't change my water pump housing to a later model {:>)

--- Now this must be where I heard this before.  It was difficult to find a tap, but McMaster Carr has them.  It looks like AN16 is a 1-5/16" -12 thread.  The tap is about $70, but I'll probably order one today, and you can borrow it when you feel like changing your housing.   The thermostat housing is just a bit smaller in diameter, but would probably still be able to be tapped in the same manner.  I may give it a try, since I have an old corroded one laying around. 

 Great!, be happy to pay rent for use!

 

Ed