Jeep's OHC Six

Crosley's were using OHC loooong before that, and besides the OHC, they also used an engine block that was a "weldment". (ie: Not a casting, but a number of pieces welded together). And the aftermarket actually made speed parts, as the Crosley engines were used in many Quarter Midget (IIRC) dirt track cars. Those speed parts today are both rare and EXPEENSIVE.