I got this in a trade I'm keeping the upper to use on Stupor Trooper. Wanting to sell or trade the lower for an unmolested, or mildly ported Holley SMII lower. This one has been ported, and welded, I suspect it has been milled too as the bolt holes are elongated. Port measurements at the outlet to the heads 2.25"x1.38". I think the underside has a coating on it, but can't prove it. Any questions let me know.