I've got a 2006 build 482 Keith Craft Robert Pond Aluminum block motor in my Cobra. I get a few drips from the main seal whenever I drive it. Looked inside bell housing with scope to see if it was pan or seal, and it looks to be originating at the seal. I was recommended by a local engine builder to try Blue Devil Rear Main Seal Stop Leak, which he had had good results with on a couple of his older builds. Have not called KC for their opinion yet.
In general, I'm not big on snake
oil, but the guy who recommended it is a solid, knowledgeable engine builder and tech. He said it didn't cause any problems and worked well.
Anyone had any luck with this product or have concerns about damaging internals? If no harm, might just try it. Will post outcome if I do, but would like to hear any thoughts from others. Thanks!