NCI NOS 1966-55 Chevrolet Truck Oldsmobile Corvette Valve Spring Cap Rotator 3729363

$95.00

type: ENGINE COMPONENTS
Vendor: CorvairFarmer

Description:

🛠️ NOS GM 3729363 Valve Spring Cap – Group 3.090 | Factory Original

Condition: New Old Stock (NOS) – Genuine GM components Part Number: GM #3729363 Group Number: 3.090 Finish: OEM-style machined steel Packaging: Bulk or original GM packaging (when available) Made in USA


✅ Verified Fitment:

This GM valve spring cap (sometimes referred to as a rotator or spring seat) was used across multiple GM platforms from the mid-1950s through the mid-1960s. It’s ideal for restorers seeking factory-correct valvetrain hardware.

Chevrolet Applications:

  • 1955–1966 Chevrolet Trucks – Inline-six and small-block V8 engines

  • 1955–1962 Corvette – 265ci, 283ci, and early 327ci small-block V8s

  • 1955–1963 Chevrolet Passenger Cars – 235ci inline-six and early small-block V8s

  • 1960–1964 Corvair – Select early models with compatible valve train geometry

Oldsmobile Applications:

  • 1955–1966 Oldsmobile V8s – Especially early Rocket engines using GM-standard spring caps

Other GM Interchange:

  • May interchange with similar-era Buick and Pontiac engines using GM-standard spring cap dimensions

  • Cross-compatible with aftermarket spring kits that retain OEM-style retainers and caps

Note: Always confirm head casting number, spring diameter, and retainer style before installation. This part is precision-fit for original GM valve springs and retainers.


🔍 Features & Benefits:

  • Genuine GM part – not reproduction

  • Machined steel for durability and correct spring seating

  • Ideal for concours restorations, vintage rebuilds, or period-correct engine detailing

  • Rare NOS component for early GM engines

  • LOCATION - 11 DRAWER - ALSO PAPER PACKAGING AVAILABLE

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