ACCEL 31035 Adjustable Vacuum Advance<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Boosts power and delivers instant throttle response for engines with HEI distributors</li><li>Provides maximum spark with no harmful pinging or detonation</li><li>Both the rate and the amount of advance are infinitely adjustable</li><li>Backed by a limited one year warranty</li><li>Comes with detailed easy to follow instructions and the Allen wrench you need to make adjustments</li></ul></div><img src="http://ecx.images-amazon.com/images/I/41CC9Gn7d6L.jpg" noproxy>