Big Bore Cylinder Kit 128" M8 `17 Up
Big Bore Cylinder Kit 128" M8 `17 Up
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Big Bore Cylinder Kit 128" M8 `17 Up
Unleash the true power of your Harley with the innovative Big Bore Cylinder Kit 128" M8 `17 Up. Designed for those who demand excellence and performance, this kit transforms your stock M8 114" and 117" motors into a robust 128" powerhouse. With over 25 years of expertise in the V-Twin industry, Rocket Cams delivers high-quality, durable cylinder and piston kits made entirely in the USA.
Key Features:
- Premium Quality Construction: Each cylinder is cast from top-grade materials, ensuring longevity and performance.
- Perfectly Matched Components: Each kit includes Wiseco forged pistons with coated skirts, specifically designed for optimal fit and performance.
- Custom Power Coating: The cylinders come with a textured black power coating and machine fins, offering a sleek appearance that complements your OE Harley motor.
- Complete Installation Kit: Each kit includes Cometic head and base gaskets, making installation hassle-free and straightforward.
Performance Benefits:
- Transforms M8 114" and 117" motors to a staggering 128" with a 4.5" stroke and 11:1 compression.
- Boosts horsepower significantly, allowing for an exhilarating riding experience.
- Recommended cam and component suggestions available for optimized performance and customer satisfaction.
Perfect For:
- Riders looking to enhance their motorcycle's performance without a complete overhaul.
- Enthusiasts who value American-made components and superior engineering.
- Anyone wanting to experience the thrill of extra horsepower and torque on the open road.
Elevate your riding experience today with the Big Bore Cylinder Kit 128" M8 `17 Up and feel the difference in power and performance!
Shipping & Returns
Shipping & Returns
📦 Shipping:
Orders are processed within 1–2 business days. Standard delivery takes 3–7 business days, depending on your location.
↩️ Returns:
You may return or exchange products within 60 days of receiving your order. Items must be in original condition with proof of purchase. If your item is defective or damaged due to manufacturing issues, we’ll replace it at no additional cost.

