I am currently rebuilding my inboard Mercruiser 350 engine. I ordered a new Edelbrock 2506 Aluminum intake and I am having a problem matching the gasket. I was told the Sierra 18-0868 was the correct one. It is correct other than the water jacket is square on the intake and round on the new gasket(pictures included). Also I replaced the thermostat housing with a Sierra 18-1989, can anyone tell me what thermostat fits this housing? The kit came with different sleeves but I cannot find a thermostat that fits correctly.
Thanks in advance for the help.
Thanks in advance for the help.