Turn your 107″ M8 engine into a 117″ by simply boring your stock cylinders! No case modifications necessary, the factory 107″ can be safely bored from 3.937″ to 4.125″. These forged pistons are manufactured for us by CP-Carrillo in 3 different compression ratios (flat top compression ratio is 11.2:1 with an unmodified 87.5cc head) and feature 1.5mm compression rings with 3mm oil rings for superior oil control. Piston kits include pistons, rings, wrist pins and circlips. USA made!

In compliance with ARB emissions laws, this product is not sold or shipped to California.

This product is not for sale or use on pollution controlled vehicles.

Weight 1 lbs
Emissions Compliant

Country of Origin

Engine Type


Fuel / Air



Customer reviews

Rated 5 out of 5 stars
1 review
4 stars 0 0 %
3 stars 0 0 %
2 stars 0 0 %
1 star 0 0 %

1 reviews with rating of 5 stars (1 of 1)

(Show unfiltered results)

1 review for Zipper’s 107 to 117″ Big Bore Pistons For Milwaukee-Eight® Engines

Add a review

Use one of the allowed file type: jpg,png.