I can not figure this out. My car runs 180 while driving slow 25-30 mph and about 190 when stopped and idoling. When i start to drive faster 50-55 mph it climbs to about 210 and wont come back down even if i slow back down again.

I have a howe alum 2 core rad. with dual spal fans and a flowkooler pump. The car has a 468 in it and it isnt running lean according to my plugs. the lower hose has a spring in it. I was wandering if sometimes BB's have a problem of getting the hot air out of the engine compartment

Any ideas?

Thanks

BBC's do create alot of heat, and have alot of iron to support heat. Even more when the cylinders are bored as this decreases the cylinder wall thickness and transfers more heat quicker to the coolant. 210*F isn't too bad, add A/C, and it bumps up to 220*F.

I have learned the min heat differential between the input hose and output hose of the radiator is anywhere from 20*F to 60*F. I felt 20*F diff was kind of low, but, it is an acceptable standard. Maybe they should drive my dually, 230-240*F and I have a 20*F diff with a 34X17X2.5 radiator.

Cutting down on the antifreeze ratio to a min of 30% a/f to 70% water by volume does help, water is the best heat transfer agent. Use a water wetter. I also use a 20 lb rad cap to prevent boiling of the coolant after the engine is shutdown and it heat soaks. Obviously, my hoses are very taut, like a guitar string, but, I have no leaks.

Maybe changing the water pump to crankshaft pulley ratio from 1:1 to 1:1.3, meaning the w/p should spin 30% faster than the crankshaft.

Another item you might try is to get some cardboard, as a test, and place it across the bottom of the valance panel to the radiator support. This will help preventing air recirculation of the fans. They may be sucking there own hot air around through the radiator. Also, from the rad support to the fender, and add a hood gasket-to-rad support. BBC's w/A/C had this gasket.

These are my thoughts and suggestions, sorry for being so long, hopefully, you'll find a way to cool.

Another idea for you is to use a 100% synthetic oil like Amsoil or Mobile One. They transfer heat faster and you end up running cooler from that quicker transfer. Oil does about 40% of the cooling of an engine and a better oil might save you some degrees.
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