Hi Mr. G., Gotta Hav it, High Priority and tomcat. Thanks for your input.
First off, I think I should be OK with the 24 B1 based on my previous try out of one last fall. I actually like the extra stern lift that it gives on this boat. My 260 porpoises a little with the three blade when trimmed out. The 4 blade eliminated that. I could turn the 24 at 4300 rpm with the old motor so I should be in the ballpark with the extra 100 hp or so from the 502. Time will tell, of course.
I am using the stock Merc remote filter and oil cooler from the 7.4L. The oil comes out of the adapter (which flows out and back in just like a filter on the engine would) through a straight hose to the remote filter pad. The opposite end of the remote pad is where I have the temp sender. It seems to me that monitoring the oil temp as soon as it comes out of the engine would give you the actual reading of the oil in the engine, maybe only a degree or two less due to cooling in the hose. The hot oil then flows through the filter and out through a straight fitting through the hose, to a 45* swivel fitting into the cooler, out another 45* swivel fitting, through the hose with a straight fitting into the center of the of the adapter and back into the engine. The cooler is only 2 1/4" X 4". Probably too small but I will have to try it and see.
I am going to try this setup for reference and see how it works before I change anything. Who knows, it just might be OK. If the oil is getting too hot, the first thing I will try is the 30psi bypass valve in the filter pad and block off the one in the block or maybe put a 30 psi one in there, too. They're only about 4 bucks each. That way I will get more oil through the cooler. If that doesn't work I think the next step will be either a larger cooler or larger lines or both.
I'll keep you posted as I find out.
tomcat, thanks for part # on the 30 psi valve. I went to the Chevy dealer today and the GM Performance book only lists one valve and that is a different #. The one I bought is the same as the one in the book.
See ya, Doug