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Engines and Components› Pistons and Piston Rings

CP Pistons

CP Pistons Harley Twin Cam, 103 cu in, 3.875 Bore, 4.375 Stroke, 7.667 rod, 10:1 CR, 85cc Head

$491.00 $466.46 Save $24.54

SKU: C00A BHM5065

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Special Order
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Professional / shop required

Description

This is a CP Pistons brand piston kit designed for 2007 and newer Harley Twin Cam 103ci Big Bore engines. It is intended for street, high-performance, and racing applications. The kit is for use with a 3.875 inch standard size 103 big bore and a stock stroke of 4.375 inches, with a 10:1 compression ratio and 85cc heads. Each kit includes 1 piston, 1 piston pin, piston rings, and pin lock rings. For a complete engine rebuild, two kits are required.

Fitment

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Specifications

BrandCP Pistons
Part NumberC00A BHM5065

Videos

Building a Solid Twin Cam 103 Part 2

Building a Solid Twin Cam 103 Part 2
120ci Twin Cam Stroker by Those Dyno Guys

120ci Twin Cam Stroker by Those Dyno Guys

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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