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1970-1995 Range Rover Classic
154 Posts
A cammed 4.2 will be equal to a stock 4.6. You should also think about the strength of the transmission. A cammed 4.6 might be too much for the stock auto or manual which are only rated to 380 Nm (280 ft. lb.) or so, especially if they are a little tired already. The 4.6 does have cross-bolted mains and a better oil pump, but as Ian said, with a 4.6 you never know what your getting in terms of block, even on the later ones.
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