That's an old Super Stock trick for days gone by. I will tell you this, at a swap meet way back in the late '80's a swapper had a set of GM sq. port heads with about a 1/2" of epoxy on the port floor going to the sort turn and I asked what that was all about. He told me we ran them in our S/S class and knocked off the index by 1.4 sec. lower, I asked if they tore them down for that, his reply was "no we just left that day and made everyone wonder what we had done". I should have bought those heads from him, but $2800 for set of GM heads was a little steep back then. Over this winter I am going to make an attempt at making a raised runner peanut port head out of a junk oval port I have laying around, just want to see what it does on the bench.