Pop the radiator cap and watch for bubbles (just make sure the engine has mostly cooled off so you don't get a face full of hot antifreeze!). Small, consistent stream of bubbles indicates a head gasket problem. Also, do you know if you have a copper head gasket? Copper head gaskets must be re-torqued after the first 100 miles or the gasket will eventually leak.
61 II 109" Pickup (Restomod, 350 small block, TR4050)
66 IIA 88" Station Wagon (sold)
66 IIA 109" Pickup (Restomod, 5MGE, R380)
67 IIA 109" NADA Wagon (sold)
88, 2.5TD 110 RHD non-hicap pickup
-I used to know everything there was to know about Land Rovers; then I joined the RN Bulletin Board.