A common mod in South Africa is to drop in a Chevrolet 4100 engine from the early seventies. This is a 250 cubic inch straight six with plenty of torque (300Nm at as low as 1500 rpm). Some left the gear ratios as is but I don't recommend this as a bigger engine now revs far too high. A friend of mine has a Nissan 2.8l petrol conversion with no overdrive or diff changes. Long distnces are painfully noisy. An overdrive will help, but for good cruising ability changing the diffs to the RR 3.54 ratios is really a help. The engine is quiet at speed and I seldom drive above 2500rpm. On a previous thread one of the guys who has done this diff conversion reckons that 2300rpm equals 55mph on his GPS. So if you can afford the consumption then higher speeds are attainable, but as mentioned previously remember the stopping distance
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What I like about driving my series is the respect I get from other motorists. I think they are very wary of clashing with it.
Long uphills do knock the speed quite a bit. But the downhills are GREAT!
