Related Clues:

• Type of engine
• Feature of some muscle cars
• Powerful car engine, informally
• Half (Pref.)
• 50 percent (Pref.)
• Spherical opening?
• Jet or charger start
• Prefix for sphere
• Jet enhancer
• Half: Pref.
• Supercharged engine
• Sphere opening
• Sphere start
• One-sixth of 34 Across
• Powerful engine