The March Performance 10307-08 is a high-performance crankshaft pulley designed for Chrysler small block, big block, and HEMI crate engines. This double 6-rib serpentine pulley is engineered to provide reliable belt engagement, reduce slippage, and improve accessory drive efficiency—while offering a sleek black finish that looks great in any engine bay.

Key Features:

• CNC-machined from high-grade aluminum
• Durable black powder-coated finish
• Double 6-rib design for maximum belt traction
• Lightweight yet strong for reduced rotational mass
• Provides improved belt alignment and stability at high RPMs

Specifications:

• Pulley Type: Crankshaft
• Material: Billet Aluminum
• Finish: Black powder coat
• Belt Type: Serpentine
• Grooves: Double 6-rib
• Fitment:
  • Chrysler Small Block 318 / 340 / 360 with passenger-side lower radiator hose
  • Chrysler Big Block 383 / 400 / 426 / 440
  • HEMI crate engines

Applications:
Perfect for Mopar enthusiasts and performance engine builders looking to upgrade their accessory drive system. The 10307-08 offers the reliability and appearance suited for both high-performance street and show applications.