Dear Friends, Recently my 4.6 HSE was hit by a lamppost, which severely damaged the body (beyond economically sensible repair). My Classic 95 has been sitting for a while with a tired 3.9 engine and I am contemplating transferring the still very juicy P38 Thor engine (Bosch motronic) into the Classic. Thoughts, knowledge, insights anybody? Does someone have experience? Is it do-able at reasonable cost, engine plus transmission possible (better match)? Engine only? What challenges lay ahead? I understand that I would need to transfer the control units ansd wiring as well. Your responses are apreciated! Joost

You would need to find a way of enabling the engine ECU, this is normally done via a handshake with the BECM.

This is not a simple swap. Was gona put a 4.6 in to my hotrod in the avitar, but it needed to be converted to run a dizzy as the 4.6 doesnt have one. So you need to swap the front timing cover and also fit a drive gear to run it. also i think you need to modify the front crank nose as the 4.6 has got a crank driven oil pump not a gear driven one. Some of the 3.9 bits will swap over but its not as easy as it first seems. I ended up putting a 4.2 in it instead. Look on this site.
Tuning the Rover V8

sell yer p38 for bits and use the money to get the 3.9 in the classic rebuilt. dont contaminate yer classic purity with unreliable p38-itus

fett said:

sell yer p38 for bits and use the money to get the 3.9 in the classic rebuilt. dont contaminate yer classic purity with unreliable p38-itus

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:clap2::clap2::clap2:

Loads of hassle....not worth it.
Sell the parts and if needs be buy a new short 3.9/4.2 short motor with the money.