Malky, my Flow Kooler looks like the pump posted by Grandville a few posts above (the pump on the left). although, It does have a disc brazed onto the fins that is the same size as the cast fins, so you are correct saying that all I can really see are the inlets and outlets. According to Flow Kooler this greatly improves the flow from idle to 3500 rpm's. I don't know, maybe I'll close up the gap to see if there is a difference. I don't seem to have an overheating problem now so maybe I should just leave it alone.
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