Jag v12 double six

[Tuscanny]

Hi all what's the options for tunning this engine.
Think it is about 300 bhp just now in a 1500 km car which gives a 0-60 in under 5 secs.
How much more could you get from this engine at reasonable costs.the v12 is in a rvd nemisus any one know the performance figures.

[accident]

how much is reasonable cost?
i suppose you are quite wealthy already as you are looking at an engine that can return single figure mpg's when pressed.
usual old school atmo mods:cams,improved exhaust manifolds and system,improved intake bigger carbs if its an old one ,throttle bodies and a modern ecu to control it.
big valve heads?
didnt a company do some after market 4v per cylinder twin cam heads a few years back?
but thats going to be silly money

[PaulKemp]

These can be over bored to 7 litres
But at £48 for a set of plugs nothing on this engine is cheap