i've recently found out that the 2.3 granada bottom end is compatible with the 2.0 dohc sierra top end setup. just a couple a things really, what are the balancer shafts for? they need modding and i read theyre in the sump or something...?

and- obviously the compression of this hybrid will be significantly higher than normal. will i have to use more expensive fuel?
any help or tips would be much gratefully thankyou yes me like