One more thing I will mention. There are several schools of thought on the new, composite (as opposed to the older, waffle steel ones) Head gaskets.
Many insist that you should plane an additional amount off, beyond true, to compensate for the apparent increase in the thickness of the gaskets. Others disagree. Whichever, the compressed thickness of the new gaskets isn't much more than the old ones, and any reduction in performance, becausee of possibly lower compression is, in my thinking, more perceived than real.
Having said that, I will say that I scratch built one of these 4.2s for my 110, and chose to take an additional. 020" off beyond true. That may seem like a huge amount, and in the grand scheme of Land Rovers, may be. However, I was making some other performance mods, and was looking for, and got 9.5+:1 compression. I know of one other 110 that may outperform mine, and it has a 5.2 in it. Punching this, in fifth, is worth standing up and taking notice.
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