Related Clues:
- It means half
- Fifty percent, up front?
- Hot rod engine, to car buffs
- Sphere header
- Chrysler engine type
- It means "half"
- Chrysler V8 engine
- Starting half?
- Start for "sphere"
- Prefix before sphere
- Half up front?
- Prefix for 'half'
- Spherical start
- Set to work to make a cheaper engine
- Engine for eg motor mower