rumblefish360 said 1.88 - by Melling PLYMOUTH Melling V1180 Melling Valves | Summit Racing No Melling’s valves at 2.02, Manley - a little pricey, though it is a nice valve. PLYMOUTH 5.6L/340 Mopar small block LA Valves Camshafts & Valvetrain Engines & Components - 2.020 in. Intake Valve Head Diameter (in.) - 0.371 in. Intake Valve Stem Diameter (in.) - 4.980 in. Intake Overall Valve Length (in.) - Free Shipping on Orders Over $109 at Summit Racing Click to expand...