Ok, Firko now I am gonna ask too many stupid questions( yes even more thna I normally do)-since I may have a lead on an AW250 engine.
Can you actually just bore the 250 liner to 76 mm?, if not do the ports in the 400 liner match, or do you need a blank of some sort? Is porting required or recommended?
I know an RM 370 piston can be used in a 400, can it also be used here?
Do you change the rod? What rod bearing etc? Must the 250 head be machined?
Base gasket used is 400..or modified 250?
Pipe would be a 400 pipe cut down to shorter length head pipe? ..250 pipe? custom pipe.
All internal 250 parts remain? Primary gearing, 2 row chain, etc-then would it be geared like a 400? Big K said he runs 13/54. I ran 14/56 on my old 440-is this eqivalent?
Demanding aren't I?
Thank you for any replies, MJ