BBC rect port #188 casting heads. Heads are in very good condition. They have 2.19 stainless intake valves. 1.88 inconel exhaust valves. Heads have had ports cleaned, and gasket matched. They were used on a supercharged jet boat. They have Isky solid lifter valve springs, Cam was .630 in. .645 ex. Also bronze guides and hard seats. They are located in Michigan. $700.00 plus shipping.