INA ZC-78359 Engine Timing Set

INA Timing Chain Kit ZC-78359

INA ZC-78359 is a premium engine timing set built for select Chevrolet and GMC applications that use a single roller .334 chain configuration. It brings together the core timing components needed for a proper chain service, with chain guides included and OE-style fitment coverage for 2002-2003 Chevrolet Avalanche 2500, Silverado 2500 HD, Silverado 3500, Suburban 2500, and GMC Sierra 3500, Yukon XL 2500, plus 2002 Chevrolet Express 3500, GMC Savana 3500, and Sierra 2500 HD.

Key Features

• INA engine timing set, part number ZC-78359
• Premium grade timing chain kit for valve train service
• Chain guides included for a complete timing repair
• Single roller .334 application noted in fitment data
• Fits select Chevrolet Avalanche 2500, Silverado 2500 HD, Silverado 3500, and Suburban 2500
• Fits select GMC Sierra 3500, Yukon XL 2500, Savana 3500, and Sierra 2500 HD
• Cross-reference: this part cross-references 5591746100 for the same application

Detailed Description

INA ZC-78359 timing chain kit is engineered for engine timing service where chain wear, guide wear, or timing noise has affected performance. The kit includes the essential chain components needed for the repair, and the included guides help restore proper chain tracking in the timing system. INA also notes that certain applications use a specially formulated chain additive from Liqui Moly to reduce friction during break-in and lower run-in wear.

For buyers searching for a Chevrolet Silverado 2500 HD timing chain kit, GMC Sierra 3500 engine timing set, or Chevrolet Avalanche 2500 timing chain replacement, this part number provides a direct service option for the listed vehicles. The ZC-78359 timing set is a premium-grade solution for timing chain maintenance on the covered 2002-2003 Chevrolet and GMC trucks and vans.

What It Helps Fix

• Timing chain noise from worn chain components
• Excessive chain slack affecting cam timing
• Guide wear that can lead to chain misalignment
• Timing-related drivability issues caused by worn valve train parts
• Break-in wear after timing system service

Installation Notes and Tips

Confirm engine code, chain style, and the single roller .334 specification before installation. Replace worn guides and inspect related timing components during service to avoid repeat repairs. Follow factory timing marks and service procedures carefully, and verify all components match the original application before assembly. This kit includes chain guides; tensioner, gaskets, and drive sprocket are not included.

Quality Assurance

INA timing chain kits are built as complete service sets for timing repairs, with application-specific components selected to support accurate reassembly. The included chain additive in certain kits is formulated to reduce friction during break-in and help limit early wear.