Built for the Big Inline. Tuned for Real-World Rumble.

Ready to turn your old-school Ford 300 inline-six into a street-rippin’, hay-haulin’, tire-hazing beast? This all-in-one combo is built around a ProMaxx CNC Cylinder Head Package, a torque-loaded hydraulic roller cam, and a fully matched valvetrain kit designed to make every cubic inch count.

Whether you're pulling trailers or pulling away from traffic lights sideways, this package flat-out delivers.

ProMaxx CNC Cylinder Head Package

• Clean, high-flow casting designed for serious street and towing performance

• CNC-ported runners deliver optimized flow for torque-first cam profiles

• Set up to accept 8mm valve hardware and modern valvetrain geometry

Master Valvetrain Kit Includes:

• 12 Stainless 8mm Valves – (6 Intake / 6 Exhaust)

• Beehive Valve Springs – Rated for .540" lift, hydraulic roller compatible

• Steel Beehive Retainers – Engineered for 8mm stems

• Forged Valve Keepers – 7° locks for secure valve control

• Viton Seals – .530" guide fit, high-temp & oil-tight

• 4140 Chrome Moly Rocker Studs – 7/16" x 12 for bulletproof rocker support

• 5/16" Guide Plates – 2-piece, set of 6

• 1.7 Ratio Aluminum Roller Rockers – Lightweight, smooth, includes polylocks

Hydraulic Roller Lifters – Ford I6

• Designed for 240/300 CID Ford 6-Cylinder engines

• .700" roller wheel for long life and high RPM stability

• Max Lobe Lift: .365” – perfectly matched to the Bowtie Buster cam

5/16" Pushrods

• .116" wall thickness for extra stiffness

• Perfect length and strength for hydraulic roller applications in Ford inline builds

Why Builders Love This Combo:

It’s the ultimate torque package for Ford 300 I6 fans who want real-world grunt and weekend throttle therapy. Matched from top to bottom—from ported head to roller cam to every last lifter and keeper—it’s a no-compromise, drop-the-hammer solution for turning your inline into a legend.

This Ain’t Just a Kit. It’s a Statement.

Forget small blocks—this is how the inline six earns respect.