INA ZC-78421 Engine Timing Set

INA Timing Chain Kit for Ford V8 Applications

INA ZC-78421 is a timing chain kit for select Ford, Lincoln, and Mercury V8 applications from 1970-1982. It brings together the core timing components needed for a proper engine timing service, with fitment covering Ford Mustang, F-100, F-150, F-250, F-350, Bronco, and related full-size cars.

Key Features

• Complete timing chain kit for engine timing service
• Includes the necessary chains, tensioners, and guides
• Some applications also include gears and sprockets
• High-performance chain additive is included in certain kits to reduce break-in friction and wear
• Fits select Ford, Lincoln, and Mercury models across 1970-1982
• Part number: ZC-78421

Detailed Description

INA ZC-78421 is built for older Ford V8 timing set applications where accurate chain drive operation is critical. This kit is listed for vehicles such as the 1970-1973 Ford Mustang, 1977-1982 Ford F-250 and F-350, 1977-1982 Ford Bronco, and 1970-1979 Mercury Cougar. In applications that require it, the kit also includes gears and sprockets, and some versions feature a specially formulated chain additive made for Schaeffler by Liqui Moly to reduce friction during break-in and lower run-in wear.

This part cross-references 5540917200 for the same application. Part number ZC-78421 is also referenced for select Ford, Lincoln, and Mercury timing service needs across the listed model years.

What It Helps Address

• Excessive timing chain stretch
• Worn or noisy timing components
• Timing drift that affects engine operation
• Guide or tensioner wear in chain-driven timing systems
• Service needs on older Ford, Lincoln, and Mercury V8 engines

Installation Notes and Tips

Verify engine code and timing drive style before ordering, especially on older Ford applications where spacer and sprocket details can vary. Some listed fitments note a gear drive set with a spacer cast into the sprocket hub; for older engines, discard the separate cam shaft spacer when specified by the application. Confirm all timing marks and component alignment during installation.

Quality Assurance

INA timing chain kits are assembled to include the essential timing components needed for a complete repair, helping reduce the chance of missing critical parts during service. The included chain additive in certain kits is formulated to reduce break-in friction and wear during the initial operating period.

Compatible Vehicles

• Fits 1978-1982 Ford Bronco, N/A
• Fits 1980-1982 Ford E-250 Econoline Club Wagon, N/A
• Fits 1980-1982 Ford E-350 Econoline, N/A
• Fits 1980-1982 Ford E-350 Econoline Club Wagon, N/A
• Fits 1977-1982 Ford F-250, N/A
• Fits 1977-1982 Ford F-350, N/A
• Fits 1980-1981 Ford E-250 Econoline, N/A
• Fits 1977-1981 Ford F-150, N/A
• Fits 1980 Ford E-100 Econoline, N/A
• Fits 1977-1979 Ford F-100, N/A
• Fits 1971-1979 Ford LTD, N/A
• Fits 1977-1979 Ford Thunderbird, N/A
• Fits 1972 Ford Thunderbird, N/A
• Fits 1977-1979 Lincoln Continental, N/A
• Fits 1970-1979 Mercury Cougar, N/A
• Fits 1975-1979 Mercury Grand Marquis, N/A
• Fits 1971-1979 Mercury Marquis, N/A
• Fits 1975-1977 Mercury Monarch, N/A
• Fits 1970-1976 Mercury Montego, N/A
• Fits 1971-1974 Mercury Colony Park, N/A
• Fits 1970-1973 Ford Mustang, N/A