From a recently produced book:
June 1997 Dealer Notice:
"As it has not been possible to obtain the current Range Rover 4.6 litre engine, due to supply problems with Rover and because of the modifications required for installation, we have arranged for a special engine to be prepared.
This uses the current 3.9 litre engine, but built using the standard 4.6 litre block. This involves stripping a new engine, removing the block, specially modifying a 4.6 litre block to accept the front cover, and rebuilding the engine.
This produces a special unit using largely standard Rover parts. The distributor set-up is largely the same as 3.9, as is the camshaft and ECU. The block is cross bolted for strength. The crank, pistons and block are standard Range Rover 4.6".
