Two return springs instead of one is a safety decision, not a performance one. If a single spring breaks or unhooks, the throttle can hang open with nothing to close it. A dual spring setup keeps a second path pulling the linkage shut, which is why most tech inspections want to see one on a carbureted engine.

Edelbrock 8005 Throttle Return Kit Details:

• Dual spring throttle return kit.
• Universal design suiting most carbureted throttle linkage setups.
• Provides a redundant return path if one spring fails.
• Sold as a kit.
• Check that the throttle snaps fully closed by hand after installation.