Originally Posted by Faster
Seakamp Engineering (Bellingham), or AAA Marine in Tacoma can supply nice little heat exchangers that might be worth looking into, but it is a pricey project. You would preserve the current condition of any loss of metals due to corrosion with RWC in play.
I called Sen-Dure (the original manufacturer of the FWC conversion kit). The gentleman I spoke to confirmed that they no longer sell the kit (low demand), but they still sell the HX (about $365, I think he said). Although the kit included a pulley operated pump (and brackets) for fresh water circulation, he advocated using a 12v pump instead, mounted on the bulkhead (along with the HX). The existing pulley driven pump would still pump RW, but through the HX instead of through the block. I assume it would still need to discharge into the exhaust elbow, so corrosion in the elbow wouldn't be reduced.
I'm guessing I could do this conversion for about $500 - $600, which doesn't seem too bad, particularly given the price of repowering.
I'd be interested in hearing feedback from others who have converted their engines to fresh water cooling.