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Return to Parts List Category : D- Big Block (Low Deck) : Gaskets & Valley Plates ARE AR300A VALLEY PLATE B ENGINE TRICK FLOW HEADS 1/4 THICK SOLID VALLEY PLATE WILL ALSO WORK WITH INDY HEADS. $175.00 AR300A is a 1/4 inch thick solid valley plate designed to work with Trick Flow 240 or other standard port type heads. This solid valley plate will only work when used with the AR392 “batwings” which provide a seal for the valley area. The AR300A is thinner than the two piece AR300 and does not have the machined access window. When using standard type cylinder heads the access window is not required since the valley plate can be removed without removing the heads. The solid valley plate can be drilled and tapped for a breather or a bung can be welded to the center for a hose fitting. Related Parts: ARE AR392 - Batwing Gasket Holders