Hi Guys I was just wanted a rough cost of changing yb Cosworth head over to run unleaded fuel any help would be great thanks richard

Doesn't it have hardened seats from factory.. It should be fine for unleaded being made around the mid 80s is when the world started to go unleaded and phase out real fuel. .. leaded !
There are people here who have yb motors and would know for definite if they are unleaded comparable.

You're certainly right there , Flighter.  I read somewhere that if you use a higher octane unleaded - 95/98 that it doesn't need to have hardened seats.  I use 95 because of higher compression but the seats were changed to hardened by the previous owner. Len

oops , my apologies, comments by Whooligan!!