I am fitting into my 1968 240 a UK spec 1985 XJ6 series3 3.4 engine with AUD 357 SU carbs from a 1968-71? series1 4.2 XJ6, how does this engine compare to the earlier Mk2 3.4 and 3.8 engines regarding BHP, torque, internal components, cooling, water passages etc. is it a better engine? anything is better than my seized 240 engine though!
engine number is 8A16366-H