Join Date: Apr 2010
Location: The Little Apple
You probably shouldn't have to use any sealant, but mine leaked terribly without it. I went with black RTV, just a tad, on the metal ports - engine block, manifolds, heater core, etc. Let it set up for a few hours with the hoses on there, just finger tight on the clamps, then after 6hrs or so gave them another turn or two to tighten them up. The RTV takes a while to cure, so that's why I let it sit. Don't let it sit and it just pooches out when you clamp down.