Complete Small Block Ford Windsor 289 302 351 185cc Alloy Cyl Heads

Aeroflow Complete Small Block Ford Windsor 289-351 185cc Aluminium Cylinder Heads (Pair)

Unlock street‑and‑strip power for your Ford Windsor with Aeroflow’s 185cc aluminium cylinder heads. Cast from smooth A356‑T6 aluminium, these heads shave weight and boost flow to deliver stronger mid‑range torque and higher top‑end power—all while staying wallet‑friendly. Optimized for idle to 6500 rpm, they’re a versatile upgrade for 289‑351 Windsor builds that crave performance without the premium price.

Key advantages

• High‑flow 185cc intake ports paired with a 58cc combustion chamber for a balanced power band
• Aluminium: A356‑T6 casting for lightweight strength and durability
• Intake Port Dimension: 2.10 in. x 1.25 in.; Exhaust Port Dimension: 1.35 in. H x 1.35 in. W
• Chamber Volume: 58cc; Intake Port Volume: 185cc; Exhaust Port Volume: 58cc
• Intake Valve Diameter: 2.02 in.; Exhaust Valve Diameter: 1.60 in.; Valve Stem Diameter: 8 mm
• Rocker Stud Thread Size: 7/16 in. x 14; Valve Angle: 20°
• Deck Thickness: 0.750 in.
• Designed for street and race engines to deliver maximum flow at a budget price
• Cam compatibility: Suits flat tappet and hydraulic roller camshafts
• Spark Plug Location: OEM

Valve gear and spring details

• Valve Spring Pocket I.D.: 1.55 in.
• Valve Guide Material: Manganese Bronze; Valve Guide O.D.: 0.500 in. (0.560 in. at base)
• Valve Spring Specifications:
  • Installed Height: 1.840 in.
  • Installed Pressure: 125 psi
  • Open Pressure: 310 psi @ 0.500 in lift
  • Maximum Lift: 0.680 in. @ 1.160 in.
  • Coil Bind: 1.070 in.
  • Spring Outside Diameter: 1.320 in.
  • Spring Inside Diameter: 0.675 in.
  • Spring Free Length: 2.300 in.
  • Valve Spring Retainer Outside Diameter: 1.250 in.
  • Valve Spring Inside Diameter: 0.410 in.
  • Valve Spring Retainer Step 1: 0.880 in.; Step 2: 0.650 in.
  • Valve Spring Locator Outside Diameter: 1.615 in.; Inside Diameter: 0.565 in.

Compatibility and installation notes

These heads are designed for both street and race applications to maximize flow without a premium price tag. They are compatible with flat tappet and hydraulic roller camshafts. Heads are drilled for 1/2 in. head bolts; if you plan to use 7/16 in. bolts, a head bolt bushing kit or step‑down bolts is required. Aeroflow provides a 1/2 in. bolt compatibility note and recommends checking installed spring seat pressure and open pressure before installation to ensure the spring pressure matches your specific application.

What this means for your Windsor build

Pair these 185cc aluminium heads with your Ford Windsor 289‑351 to achieve a well‑rounded setup that improves mid‑range torque and boosts top‑end power. The combination of efficient port sizing, compact chamber volume, and robust valve gear makes them a reliable upgrade for both daily drivers and track‑tuned engines, all while keeping installation practical and affordable.