Henry_b
Think outside, no box required.
Yep You're right 3.9/4.0 is identical apart from the later Thor 4.0's have Cross bolted mains.I actually think You will find (haven’t checked) but the 3.9 & 4.0 is one and the same, the 4.6 is the same but stroked.
I might be wrong and just had a dream
I was offered 5.2. When I replaced our 4.6.
J
The 4.6 is indeed just a stroked 4.0..
You can get 5.6litres from a Rover V8 if you dare