LSX Innovations BT10 LS1/LS6 Corvette Billet Aluminum Manual Belt Tensioner w/ Pulley Our manual belt tensioner will help eliminate belt slip associated with factory spring type tensioners in high performance applications. Our LS1 manual belt tensioner is made in the USA from aircraft grade billet aluminum They also come with the required grade 10.9 hardware, and tensioner pulley required for install. Works on LS1/LS6 Corvettes only. Easily set the tension on your LS1 manual belt tensioner with a crescent wrench, and stop those pesky belt slip issues today!