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These pumps are very rare as they were used for only about a month. They first came out in June 1965, but were quickly superseded by the C6OE-A pump even before the end of 65 production. As to impellers, they can easily be changed by a rebuilder. There are quite a few 6-vane 4" impellers (HiPo-type) out there. Knowing all this, some rebuilders use these impellers on water pumps with desireable casting numbers and sell them as HiPo water pumps for significant money. For someone who has a Mustang made in June 65 with L8 on the engine tag, the C5OE-8505B water pump is the one they need for concours-correct restoration. With so few serviving, they are extremely difficult to find. I think I have come across only two in the last 20 years. (unlike the C6OE-A pump which is easy to find because it was used for about 2½ years). So, you have a very limited market (low demand) and a rare part (limited supply). The two balance each other for value (based on supply and demand), but I consider a rebuildable one worth about $100. Swap out the impeller for the correct on for a HiPo (about 2" depth, 4" diameter, and 6-vanes with three round holes) and you could at least double that to the right person.
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Hi it would seem as though these water pumps are worth alot more in the market place ie. $400 for a reconditioned original "C5OE-8505-B" cast iron water pump.
http://www.hipomustang.com/hpmx/topic.asp?TOPIC_ID=10692
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"kar-nut" Posted - 10/17/2010 :
RARE Remanufactured C5OE-8505-B Cast Iron Water Pump $400.00 to your door.
SOLD 3 days later.
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