COMP Cams Rev Kit Chev 350 # CC4000Rev Kit, Bushings, Springs, Aluminum Support Bar, Chevy, Small Block, Kit CC4000 Rev Kit Support Bar Material: Aluminum Rev Kit Lifter Springs Included: Yes Rev Kit Lifter Spring Bushings Included: Yes Lifter Outside Diameter (in.): 0. 842 in. Quantity: Sold as a kit. COMP Cams Rev Kits Having one of these COMP Cams Rev Kits will give you that confident feeling. In the event of pushrod or rocker arm failure, you don't have to worry about the lifter