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Return to Parts List Category : A- Small Block "LA" : Valves HUG 1010 EXHAUST VALVE 3/8" STEM 1.60" HEAD STAINLESS STEEL MATERIAL, CHROME STEM AND TULIP HEAD. LENGTH 4.990" $14.26 Stainless Steel Material, Chrome Stem And Tulip Head.      Head size: 1.60" Length: 4.990" Stem Diameter: 3/8" Type: I   All L.A. and Big Block Chrysler engines originally used 3/8" valve stem sizes. We recommend up-grading to 11/32" stem valves. Normally, when installing new valves, valve guides are needed. Install 11/32" guides and valves at that time. The cost will be similar and you will enjoy the benefits of lighter weight and less restriction to air flow.