Complete Small Block Ford Windsor 289 302 351 185cc CNC Ported Alloy Cy Heads

Upgrade Pair for Ford Windsor 289–351

Boost your small-block Ford Windsor build with a complete pair of CNC-ported aluminium cylinder heads designed for street and strip performance. Crafted from rugged A356-T6 aluminium and featuring fully CNC ports and combustion chambers, these heads deliver modern flow characteristics at a price-friendly option. Engineered for idle-to-6500 rpm operation, they unlock impressive efficiency and power from 289–351 cubic inches.

What makes them unique

• Ultra-smooth A356 aluminium castings with precision CNC ports and combustion chambers
• 5-angle competition valve job with hand bowl blending and diamond-honed bronze guides for reliable valve seating
• Large dual valve springs (1.32" diameter) to handle up to 0.600" lift
• Designed to outperform many premium brands while remaining affordable

Key specifications

• Pair of heads for Ford Windsor (289–351)
• Material: A356 Aluminium
• Chamber: 58cc
• Intake port volume: 185cc
• Intake port dimensions: 2.10" x 1.25"
• Exhaust port volume: 63cc
• Exhaust port dimensions: 1.35" x 1.35"
• Spark plug location: OEM
• Intake valve diameter: 2.02"
• Exhaust valve diameter: 1.60"
• Valve stem diameter: 8mm
• Valve spring pocket I.D.: 1.55"
• Valve guide material: Manganese Bronze
• Valve guide O.D.:.500" (.560" at base)
• Rocker stud thread size: 7/16" x 14
• Valve angle: 20°
• Springs and hardware – Installed height: 1.850"
• Installed pressure: 125lbs
• Open pressure: 325lbs @ 500"
• Maximum lift:.600" @ 1.160"
• Coil bind: 1.070"
• Spring outside diameter: 1.320" | Inside diameter: 0.680" | Free length: 2.300"
• Valve spring retainer outside diameter: 1.250" | Inside diameter: 0.410"
• Valve spring locator outside diameter: 1.400" | Inside diameter: 1.330"
• Rocker studs compatible with 7/16" x 14; drilled for 1/2" head bolts

Compatibility & installation notes

• Suits flat tappet and hydraulic roller camshaft
• Drilled for 1/2" head bolts; if using 7/16" bolts, a head bolt bushing kit or step-down bolts is required
• Important: check installed seat pressure and open pressure before installation to ensure correct spring pressure for your application

Use cases & performance

These complete heads are engineered to maximize performance for street and strip engines within the idle-to-6500 rpm range. They’re especially well-suited for budget-conscious builds that still demand strong air flow and reliable valvetrain performance. Pair these heads with a compatible camshaft and supporting components to achieve improved efficiency, better airflow, and enhanced overall engine response for Ford Windsor builds from 289 through 351 cubic inches.

What you get

• Complete pair of CNC-ported aluminium cylinder heads for Ford Windsor (289–351)