A plug thread, I can't resist.
Splitfires are crap. It is old tech that was tried in the 50's (or 60's) and didn't work then either.
Bosch platinums - crap also - sorry guys. Electrode contact point is too small. Can lead to fouling in some older engines. Only run these plugs in engines that were designed for them. (+2 and +4 designs are Ok, but Beru was first.)
Beru - Now this is a spark plug. Specifically the Ultra-X. The problem that most plugs have is that they shield the spark from the fuel mixture. This can be overcome with a well designed combustion chamber that has good swirl. However, most don't. The solution is a plug that puts the spark it direct contact with the mixture. This means that the plug should fire against the side of the electrode and not the top of it. Check these plugs out.
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.