Key Features:

CNC-Ported Bare Casting – Precision-machined for optimal airflow and unmatched consistency straight from ProMaxx.

Blueprinted & QC Tested – Pressure-tested, dimensionally verified, and ready to handle the demands of performance builds.

Competition Valve Job – High-performance seat and guide work for maximum flow and sealing.

Premium Valvetrain Components:

• Beehive Performance Springs for increased RPM stability.

• OEM Valve Spring Retainers for reliability under load.

• 8mm Valve Locks (OEM LS Style) for secure valve retention.

• 1-Piece Stainless Steel Valves – 1.60" Exhaust & 2.00" Intake, 21-4N Stainless, boost-ready up to 15 PSI.

Enhanced Geometry for Roller Rockers:

• Machined rocker pad stands specifically for roller rocker clearance on the ProMaxx 300 head.

• 4140 Chromoly 7/16" Rocker Studs (180,000 PSI tensile strength, 1.950" OAL).

• 2-Piece Guide Plates for 5/16" Pushrods & 7/16" Studs.

Precision Machining Work:

• 8mm guide liners installed & honed to size.

• Skim-milled deck surface for guaranteed gasket sealing.

Complete Assembly:
Arrives assembled and ready to bolt on — saving you hours of prep time.

Why This Kit Rocks:

This isn’t just a head; it’s a fully engineered solution for Ford 240/300 performance builds. Whether naturally aspirated or boosted, this package ensures stronger valvetrain control, superior sealing, and airflow to feed your inline-six’s appetite for torque.

Boost your build. Boost your confidence.
With the ProMaxx Ford 300 CNC Ported Head Kit, you’re not just upgrading parts — you’re unlocking the full potential of your legendary inline-six.