CP-Carrillo BHM8107-4 Forged Piston Kit Milwaukee-Eight 107ci 3.937" Bore 10.5:1 CR

The CP-Carrillo BHM8107-4 is a high-performance forged piston kit designed for the Harley-Davidson Milwaukee-Eight 107ci engine. Engineered for builders seeking increased reliability and performance over OEM components, this kit delivers race-proven construction in a street-friendly 10.5:1 compression ratio.

Key Specifications:

• Engine Displacement: 107 cubic inches
• Bore: 3.937"
• Stroke: 4.375"
• Compression Ratio: 10.5:1
• Compression Height (C/H): 1.143"
• Dome Volume: +4 cc

Construction & Features:

• Forged from 2618 heat-treated alloy for superior strength and durability under high-stress conditions
• Forced pin oilers for enhanced lubrication and longevity
• Advanced cam and barrel skirt profiles for precise bore fitment and reduced friction
• Exceptionally flat and smooth ring grooves machined to the tightest tolerances
• Compatible with stock tapered rods or aftermarket H-beam connecting rods
• Available with standard or Kramm Lox style wrist pin locks
• Designed to accommodate +1mm larger valves and high-lift camshafts
• Manufactured in the USA

CP-Carrillo's BHM8107-4 piston kit includes a premium ring pack — a steel gas nitride coated top ring, ductile iron Napier second ring, and a three-piece flex-vent oil ring — delivering outstanding sealing and oil control. The kit is sold as a pair (two pistons) complete with rings, wrist pins, and circlips, making it a complete solution for a 107ci Milwaukee-Eight build.