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the tray in most pre 31's has the bead which snaps into the pan in the center line of the flanges along the sides of the tray. On the late 31 and B tray, the upset is above the center line. Page 576 of the Service Bulletins explains that the center bead of the tray was raised 1/8th inch to lower the tray into the pan the corresponding amount. If your engine came with the splash shield installed and you have not changed the tray, it should work OK.