The Ultimate 8mm Setup for Hydraulic Roller Dominance

Ready to take your ProMaxx 300 Ford heads from good to master status? This kit’s got everything you need for a bulletproof, high-RPM valvetrain that doesn’t quit. Stainless 8mm valves, race-ready springs, plus all the hardware and rocker upgrades to keep things rock solid under the harshest conditions.

What’s In The Box:
12 Stainless 8mm Valves (6 Intake / 6 Exhaust) — lightweight, durable, and designed for performance
Beehive Valve Springs — hydraulic roller compatible, rated up to .540" max lift
Steel Beehive Retainers — precision fit for 8mm stems
Forged Valve Keepers — secure 7° locks that won’t quit
Viton Seals — top-tier oil control for 8mm valves and spring seats
Rocker Arm Studs — 4140 Chrome Moly, 7/16" x 12, ultra-strong to handle the heat
Guide Plates — 5/16", 2-piece style, set of 6 to keep your rockers lined up and free of drama
1.7 Ratio Roller Rocker Arms with Polylocks — maximize valve lift and RPM potential with ultra-smooth roller action

Why This Kit?
Because your ProMaxx 300 deserves a valvetrain that works as hard as you do. The combo of lightweight 8mm valves, beehive springs, and hardened hardware lets you push your hydraulic roller cam right up to its limit without the headaches of float or instability. And the roller rockers? They crank up lift and efficiency with smooth, quiet precision.

Built Ford Tough. Built For Speed.
Bolt it up, torque it down, and let your engine scream with confidence.