I plan on installing an oil cooler as part of my rebuild. 15.5', Aluminum Jetboat, 406sbc. Rexmar has a 2" model that has 3/4 water ports. I was thinking about running my block cooling water through the oil cooler first (kinda like having the water pass through jacketed manifolds as a preheater). I also run a pressure regulator set at 16 psi. Anybody tried any thing like this? Would I still have enough cooling capacity for my block?
May as well step up now as later. Go with the Olsen, bolt to the block cooler. If you don't, you'll always wish you had. Expensive? Yes. Worth it? Yes. The Olsen cooler will flow enough to allow the preheating as you mentioned, and keep the "blood" of the engine, oil, plenty cool. Any oil cooler is a good investment, the better the cooler, the better the investment...........MP