From original post:
who actually has a 300tdi head on a 200tdi block!? - Land Rover Zone
A 300 tdi cylinder head WILL bolt straight onto a 200tdi block but you need to understand that there are quite a few differences and you will need to make a few changes to make the engine run correctly. The first thing to consider is the differences:
1) different rocker shaft assembly
2) different type of two-stage Bosch injectors
3) different injector pipes
4) different piston crowns
Before you even think about putting a 300tdi cylinder head on a 200tdi block you will have to be prepared to take the pistons out and swap the piston heads for those to suit a 300tdi. The combustion chamber in the 300tdi piston crown is in a different position to that of a 200tdi to compensate for the angle that the 300tdi injectors enter the head. If you use 200tdi pistons, the combustion chamber is in a completely different place and the diesel will not burn properly.
You will also need to have a complete 300tdi cylinder head including the rocker shaft and injectors etc. they are not interchangeable. The injector pipes have a different size union at the injectors and because the 300tdi injectors have two different opening pressures, you will either need to source a non-EDC injection pump from a 300tdi, or have the pump recall rated at a diesel injection specialists. Ofcourse, by this point, it would work out more worthwhile swapping the entire engine for a 300.
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