SKU: MPP6311
MPN: 6311
The 6 Rib 5-3/4in Crank Pulley from March Performance is an essential upgrade for engine enthusiasts seeking to optimize accessory drive efficiency and reduce parasitic drag on naturally aspirated or forced-induction powerplants. This serpentine pulley replaces the factory unit and directly drives alternators, water pumps, and power steering components with minimal rotational inertia. Whether you're building a street performance engine or fine-tuning a track-focused platform, a quality crank pulley upgrade delivers measurable gains in usable horsepower by allowing the engine to work smarter, not harder.
March Performance's 6-rib design accommodates modern serpentine belt systems while the 5-3/4-inch diameter provides optimal pulley ratios for street and mild performance applications. The aluminum construction keeps rotational mass low, reducing the inertial load on your crankshaft and improving throttle response and acceleration characteristics. The six-groove profile ensures positive belt engagement without slippage, critical for maintaining accessory component speed under high-RPM operation or boost conditions. This configuration works across a broad range of engine platforms, making it a versatile choice for engine swaps, restorations, and performance modifications where OEM pulleys prove inadequate.
Mechanics and enthusiasts favor March Performance pulleys for their durability and precision engineering, particularly in high-performance builds where every fraction of a horsepower counts. Installation requires removing the serpentine belt and unbolting the factory pulley—a straightforward procedure on most applications, though engine-specific fitment varies depending on your platform's crankshaft diameter and bolt pattern. Verify compatibility with your exact engine make, model, and year before ordering, as crank pulley sizing is engine-specific and cannot be retrofitted across dissimilar platforms. Pair this pulley with a properly tensioned belt system and quality alternator for a complete, reliable accessory drive setup.
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