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the V8 is a short stoke motor.it only obtains reasonable tourque because of many pistons,designed more to rev.
the leyland 4.4 was a square bore engine--round piston but bore and stroke are the same.these have a little more engine braking but they dont like more than 3750 RPM.
the hjz75 troop carrier we use have lots of wheel spinning grunt.on the road the engine revs harder than you think.
REVS V FUEL USE.
some engines use less fuel at higher rpms.
Not quite Davehoos , the old 2H bumbruiser had a comp of 20:1 , his old RRC V8 when new was 8.1:1 ,with a 200000 to 300000 Ks on the clock its probably more like 7.6:1. Now add in 8 to 16 Degrees of Cam retardation , due to Stretch /wear etc and the old RRC wont have any engine retardation to around 4000 RPM . Oversquare.undersquare,square , number of pistons , engine config has nothing to do with it !! Do you know what Rod Ratio means ? Piston speed ? . Just running enough spark advance can make a ****load of difference to downhill engine braking for a Petrol engine !