I don't have a dog in the 440Source water pump fight (I use a crusty iron housing from a junkyard) but here's what 440Source said about them on a recent Moparts thread FYI:
"This is 100% correct. We used to sell the CAT housings with the small ports, along with dozens of other vendors in the Mopar world who were CAT distributors. We sold several thousand of them. Some were made for us under contract with our logo, others were just the standard CAT brand directly from their warehouse which we relabeled (usually we did this when we were low on stock to avoid being out of stock, since the housings were identical except for the logo.)
For several years we used these housings on our own cars, on test stand engines and dyno engines and never had any problems with them. We had a handful of customers (maybe 12-15 total that I can remember off the top of my head) that had overheating problems. However, overheating problems can be tough to track down.
After the Moparts thread about the small ports came out, someone on here who actually had a water testing flow bench did test the housing and found that the small ports did not actually cause a restriction, and that they actually outflowed 90% of the high volume water pumps on the market. If I remember correctly, they tested a small port housing with a Milodon pump, an Edelbrock pump, and one of our pumps, and the small port housing outflowed all three pumps. I'm sure somebody can find the thread on here.
Between these test results, and the fact that the housings always worked perfectly well for us and for the vast majority of customers who used them, initially we didn't feel the small ports were a "defect." You can see proof of this in the threads about it, for every person who has a problem, several others report that they are running the housing and have been for years with no issues.
Regardless of this, we always try to improve anything we sell, and it was obvious some people didn't like the small ports. So we stopped carrying the CAT housings. We had our own tooling made with large ports (no small investment) and those are the newer ones we have been selling for the last several years.
In response to your request to return that housing you bought in 2006, unfortunately I do apologize but that's going to be a bit of a stretch. We do offer a full one year return period on everything we sell, which we feel is already pretty generous. It is four times as long as Summit's 90 day return policy, and 12 times as long as Indy Cylinder Head's 30 day return policy, just to name a couple of our competitors. But on something that was bought over 7 years ago, the company records are sealed and archived. That order won't even come up in our computer system anymore.
We do feel that any transactions between us and our customers should be fair on both sides. That means if a customer orders something and there's something they don't like about it, (as long as it's brand new and re-shelvable), we feel it is our responsibility as a vendor to allow them to return it. In fact, as long as the customer exchanges it for something else or takes store credit, we will even waive any kind of restocking fee, and give them 100% credit back.
However on the other side of the coin, to be fair to us, the customer likewise also has a responsibility to do this within a reasonable amount of time. To expect us to take something back after more than 7 years later because you suddenly found something you didn't like about it isn't fair to us. You implied in your post that you would consider it poor customer service if we would not return the housing, but I hope you can understand our position on this. We do appreciate your business, and 2014 marks over a decade that we've been in business selling nothing but Big Block Mopar parts. We didn't survive this long (and through the worst recession in 80 years) by being unfair to customers and selling inferior products. "