BCBC VS-840 Engine Valve Spring

Engine Valve Spring for Ford and Mercury Applications

Melling VS-840 is a standard replacement engine valve spring built for a wide range of Ford, Mercury, and Lincoln applications. It is a single-spring design made from corrosion-resistant steel and specified for stock use with the listed camshaft and engine combinations.

Key Features

• Single spring design for stock replacement use
• Corrosion-resistant steel construction
• Standard replacement grade for common service needs
• Open pressure rated at 229.0
• Fits applications with 0.99 inside diameter and 1.39 outside diameter

Detailed Fitment and Application

This Melling valve spring, part number VS-840, is listed for a broad range of classic Ford, Mercury, and Lincoln engines from 1968-1989. Fitment includes stock applications such as Fits 1975-1989 Ford E-250 Econoline Club Wagon, N/A; Fits 1975-1989 Ford E-350 Econoline, N/A; Fits 1983-1989 Ford F-250, N/A; Fits 1972-1978 Ford LTD, N/A; and Fits 1968-1971 Lincoln Mark III, N/A. Many listings note use with the SYB-19 camshaft or exclusions for police, Cobra Jet, and Super Cobra Jet engines.

What This Part Helps Address

• Weak or worn valve spring tension
• Valve control issues in stock engine setups
• Replacement needs during camshaft service
• Spring fatigue from long-term engine use
• Incorrect spring specification for listed applications

Installation Notes and Tips

Verify the listed application notes before installation, especially the SYB-19 camshaft requirement and the exclusions for police, Cobra Jet, and Super Cobra Jet engines. Confirm coil bind height, open height, and spring dimensions against the cylinder head and valvetrain setup before assembly. Part number VS-840 should be matched to the exact engine configuration shown in the fitment data.

Quality Assurance

Melling offers valve springs across standard, mid-range, heavy-duty, and race-ready categories, with multiple spring designs available for different valvetrain requirements. Part number VS-840 is part of the Stock line and is built as a standard replacement component.