RBS makes it easy for a racer wanting to use a set of fuel Hemi heads on their alch. motor. With these machined plugs simply put a light coat of silicone around them set them in place and tighten the valve cover against them and your done.
Made from brass and there is a right or left side when installing make sure you have installed on the correct side of the engine. Block measures 1.00" long, .625" tall and .750" wide then tapers to .720".
Plugs are sold each so if doing a set of heads be sure to order four.