Anyone know what cylinder head was used on 70s vintage four cylinder 192 natural gas engines?
Obviously the compression ratio was increased for use on natural gas but it's hard to imagine that Ford cast a special head for the 192 NG engine. Of course, the use of a 172 gasoline cylinder head would result in a higher compression ratio than the same cylinder head used on a 172 engine with smaller bore.
Asking because I have one with VERY low hours. I've "converted it to gasoline" simply by removing the NG equipment and bolting on a late 172 "big" carburetor.
I'm guessing that the NG engines needed significantly more compression than did the gasoline versions. 8.5:1??? Seems like I've seen the CR spec somewhere but cannot recall where.