Yep but if you unbolt engine A from gearbox A and fit engine B with gearbox A they will not work. It will be in the tranmission and engine control units will be pared.I like Clarksons quote on the Nissan GTr having nitrogen filled tyres and the general attention to detail...
The attention to detail has been extraordinary. For instance, the GT-R’s tyres are filled with nitrogen because ordinary air expands and contracts too much. And each gearbox is specifically mated to each handmade engine”
Does that mean "bolted together"..?
Seems a bit silly really.