The 1955 Chevrolet 150 Utility Sedan occupies a distinct niche in the Tri-Five hierarchy, originally designed as a stripped-back, business-focused machine without a rear seat. This Washington-registered example has evolved far beyond its utilitarian roots following a multi-year professional build completed under current ownership. By integrating a Shafiroff-built big block with a modern pro-touring chassis, the car balances its period-correct Sea Mist Green aesthetics with elite-level mechanical performance. Now showing only 6,000 miles since the completion of its refurbishment, it represents a sophisticated execution of the “sleeper” philosophy.
Sea Mist Green Finish and Staggered Steel Wheels
Retaining its factory-specified Sea Mist Green (586), the body underwent a full disassembly and repair process before being refinished in 2015. The exterior maintains the 150 series’ characteristic restraint, featuring crisp chrome bumpers, a classic hood ornament, and minimal brightwork compared to its Bel Air siblings. Beneath the fenders, the stance is defined by color-matched 15-inch steel wheels with dog-dish hubcaps, creating a deceptive factory appearance. This conservative look is contrasted by staggered tires, 215/70 Yokohama fronts and 275/60 Nitto rears, hinting at the substantial torque produced by the Shafiroff powerplant.
Utility Configuration with Modernized Cabin Controls
In keeping with the Utility Sedan designation, the cabin features a split-folding front bench without a rear seating area, maximizing cargo space in the traditional 1211B style. The interior has been refreshed with black vinyl and gray patterned cloth upholstery, complemented by color-coordinated door panels. Functional upgrades include a Vintage Air climate control system and a Lokar shifter, while the driver interface is enhanced by a leather-wrapped steering wheel on an Ididit tilt column. Instrumentation is handled by a precise AutoMeter suite, including a column-mounted 8k-rpm tachometer and a 160-mph speedometer to monitor the upgraded drivetrain.
Shafiroff 402 V-8 and Race-Grade Drivetrain
The mechanical centerpiece is a 402ci V8 built by Shafiroff Race Engines, utilizing a Dart SHP block, Dart PRO1 aluminum heads, and a COMP Cams hydraulic roller camshaft. This high-output engine features a SCAT crankshaft and forged 10:1 pistons, delivering power through an ATI Performance Products TH400 three-speed automatic transmission. Power is managed by a Ford 9-inch rear end equipped with a Strange Engineering center section and 4.10 gears. Dual exhaust with MagnaFlow mufflers provides an authoritative note, while the cooling is handled by a Griffin aluminum radiator with dual electric fans.
| Technical Specifications | |
|---|---|
| Engine Type | Shafiroff 402ci V8 (Dart Block) |
| Induction | Quick Fuel 830-cfm Carburetor |
| Transmission | ATI Street Strip TH400 Automatic |
| Rear End | Ford 9-inch w/ 4.10 Gears |
| Front Suspension | Jim Meyer Racing Independent |
| Braking System | Four-Wheel Disc Brakes |
Market Position of the Pro-Touring Tri-Five
The 1955 Chevrolet 150 Utility Sedan is an increasingly popular platform for pro-touring builds due to its lighter weight and cleaner lines compared to more ornate models. This build distinguishes itself in the market through the use of high-tier components like QA1 coilovers and a Jim Meyer Racing Products independent front suspension. Benchmarked against standard 150 restorations, the integration of a rack-and-pinion steering system and a four-link rear setup provides a level of handling and stability that far exceeds the original factory benchmarks, making it a highly competitive entry for enthusiasts who prioritize performance.
Documented Build History and Chassis Precision
Ownership of this modified 150 is backed by extensive build records and photos detailing the transition from a 1960s Washington survivor to a modern street machine. The chassis has been engineered for durability, utilizing Dutchman axles and a Strange Engineering driveshaft to handle the big block’s output. Recent maintenance ensures the car remains in peak operating condition, while the inclusion of outboard shoulder belts adds a necessary layer of modern safety. For the collector seeking a vehicle with “Classic” brand documentation and a proven mechanical pedigree, this Sea Mist Green sedan offers a turn-key solution for both show and high-speed touring.
Performance Engineering in a Classic Silhouette
The 1955 Chevrolet 150 Utility Sedan represents a perfect marriage of mid-century aesthetics and modern race-grade engineering. By pairing a Shafiroff big block with a contemporary suspension architecture, this build provides a visceral driving experience without sacrificing the iconic Tri-Five look. It remains a standout example of the pro-touring movement, offering reliability, power, and a subtle presence that continues to command respect on the road.
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Source: bringatrailer.com
