Is there a great improvement going from 3 baled fan to a 4 blade?  Or is there something else I should do as in slow speed the heat start to rise but does not over heat. 

Phil,
Which gen. CASCO pump do you have? While speaking with Chris (Paragon) re: his improved spacer design, the subject of 1st gen. Casco riveted pump blade failures came up.  With my coolant drained & fan removed, I noticed a subtle tinkling sound when spinning the pump shaft (loose rivets?). According to Chris, when those blades finally do come off, they sometimes make a hole in the spacer, and result in sudden coolant loss. Current 3rd. gen. pumps have a solid impeller with deeper vanes, and they can upgrade your pump ($50), something I plan to do though I have to wonder how much life is left in the pump bearings after running their (nose-heavy) clutch fan setup for over 25K miles? (no discernible side play, but impeller/shaft DOES spin quite easily).

6 VOLTS/POS. GRD. NW INDIANA

If I recall correctly, Casco's $50 upgrade consists of adding the riveted vanes to your pump. They will not replace yours with the 1-piece cast vanes (I wish they did). I have one of their riveted pumps; although it's still intact (little use), I don't intend to use it when my engine is rebuilt. 

THANK YOU blacktie!
I misread their catalog blurb. It DOES say the upgrade is ‘2nd gen.’. I only assumed they would naturally use their latest impeller design (go figure).  Also, they charged me $60 (inflation?) to supposedly reserve an impeller (catalog stated ‘while supplies last’, so I also ‘assumed’ a 3rd gen. production/delivery problem. Rather deceptive on their part, creeping senility on my part).
I will likely apply the $60 toward a new pump, or maybe they will just send me a 3rd gen. impeller, if they have them stocked separately, and it will merely press-on (?) whatever pump shaft I want (I have an alum. pump on my spare motor).

6 VOLTS/POS. GRD. NW INDIANA

It's highly unlikely that Casco will send the cast impeller to you, but they will sell the latest generation pump/w cast impeller. Expect to pay about $30 for shipping. You can get the same pump from Concours, and they are having a 10% off Labor Day Sale through the 9th. 

Thanks again blacktie,
I fleshed out the 10%-off order and got free shipping (over $30) also.  Fresh pump bearings for now, and likely can salvage the impeller later on.  Will cancel the Casco order.

6 VOLTS/POS. GRD. NW INDIANA

Daniel, did the free shipping include the pump? They told me it's considered a heavy/bulky item for which free shipping doesn't apply. Of course, the cost would be included in the $300+ for free shipping for your other items. 

Happy to be of service. Isn't that why we're here?

No. $30, but everything else free.

6 VOLTS/POS. GRD. NW INDIANA

Only one way to find out - call them about it.





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