818-823-9107 ... Here's a fully rebuilt set of big block chevy bbc heads. They are rectangular port 188's same as 990's. They are fresh from the machine shop, completely rebuilt. Resurfaced, new stainless steel valves 2.25 intake and 1.88 exhaust. Valve enlargement to the intake are the only modifications. These are Gen IV heads ready to go, decided to use another set instead.