Xtreme Duty Hi-Tech Belt Drive w/ Idler for SBC/Olds Rocket and 1.250" belt

• Extreme application belt for high rpm and high compression durability

• Infinitely adjustable Vernier sprocket for absolute timing accuracy

• Unique belt idler system reduces flap throughout rpm range

• Designed to absorb crankshaft harmonics to guard against performance robbing valve train instability

• Utilizes a unique camshaft thrust adjustment system without shims

• Includes double lip seals for long life and maximum crankcase vacuum

• Ideal for serious street performance and race applications