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:
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Beehive Performance Springs for increased RPM stability.
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OEM Valve Spring Retainers for reliability under load.
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8mm Valve Locks (OEM LS Style) for secure valve retention.
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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:
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Machined rocker pad stands specifically for roller rocker clearance on the ProMaxx 300 head.
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4140 Chromoly 7/16" Rocker Studs (180,000 PSI tensile strength, 1.950" OAL).
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2-Piece Guide Plates for 5/16" Pushrods & 7/16" Studs.
Precision Machining Work:
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8mm guide liners installed & honed to size.
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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.