PRW Industries 5135021 Dual Idler Timing Gear Drive Set Small Block Chevy Noisy Steel Kit

The PRW Industries 5135021 is a dual-gear, dual-idler timing gear drive set engineered for Small Block Chevy engines (262–400 cubic inch, 1955–1995), excluding factory hydraulic roller cam applications. Built from high-strength steel alloy, this noisy-style gear drive delivers precise, reliable cam-to-crank timing without the slack or wear associated with conventional timing chains.

Key Features:

• Dual-Gear, Dual-Idler Design – Provides direct, positive gear-to-gear timing drive for maximum accuracy
• Steel Alloy Construction – High-strength steel alloy gears resist wear and add long service life under demanding conditions
• No-Stretch Performance – Unlike timing chains, gear drives will not stretch or wear prematurely under extreme operating conditions
• Low-Friction Bearings – Axial needle and cage thrust bearings combined with silicon bronze bushings minimize friction and heat
• Minimal Machine Work Required – Dual idler design requires little or no block machining for installation
• Adjustable Cam Timing – Offset bushings allow for easy cam indexing and on-the-fly timing adjustments
• Made in USA
• Includes: PRW Extreme Pressure Assembly Lube and Threadlocker

Important Notes: This gear drive is not designed for use with engines equipped with a factory knock sensor. It is also not compatible with factory-equipped hydraulic roller cam and lifter engines. If your application uses a retrofit or aftermarket roller cam, please verify compatibility before ordering.

PRW Industries is a global manufacturer of racing and performance aftermarket engine components, offering high-quality parts at a competitive value. The 5135021 gear drive is the noisy variant — the quiet version is available separately as part number 5135022.