I've been wondering about stroking my 540i and since I have picked up some m60 heads I might as well do everything at once.
Alot of ppl and builders use M5 crank with arrow rods and forged pistons....
BUT I never want to go with any kind of boost because I prefer a naturally aspirated engine.
How about just using the M5 crank and stock rods which are forged and forged pistons STD size? knocks off 3k for sleeving and about 2500 for rods ..I think ha
I didnt do any math but thats probably around a 4.6 or 4.7
I've looked at my cylinder walls about 5k miles ago and looks great!
I'd stay around 12.0:1 compression
m60 heads and cams
and supporting mods ie fuel tune