Ford 428 Engine for Sale | OEM FE Big Block V8 7.0L (1966 to 1970)

Description

Engine Background

The Ford 428 FE big block was introduced for the 1966 model year as a practical evolution of the FE engine family that had grown from the 332 introduced in 1958. Ford’s engineers created the 428 by combining a 4.13-inch bore (smaller than the 427’s 4.23-inch bore but larger than the 390’s 4.05-inch bore) with a 3.98-inch stroke, longer than the 427’s 3.78-inch stroke. The result was a 428-cubic-inch engine that was dramatically easier to manufacture than the hand-built 427 while producing competitive torque figures for its intended purpose: powering full-size Fords, Thunderbirds, and Mercurys in smooth, effortless style.

In its standard Q-code form, the 428 produced 345 hp and 462 lb-ft of torque, numbers that gave the 1966 Galaxie 500 7-Litre effortless passing power and smooth highway performance. Ford simultaneously offered a Police Interceptor version (P-code) with an aluminum intake manifold, solid lifters (1966 only, changed to hydraulic in 1967), and a more aggressive camshaft at 360 hp. These police units have become sought-after cores in the restoration community due to their typically low mileage, thorough maintenance history, and higher output tuning.

The 428 Cobra Jet (introduced in April 1968 using 427-style large-port heads and a Holley 735 cfm 4-barrel) transformed the 428 into a genuine performance engine. However, the standard 428 remained in production for full-size Ford, Mercury, and Thunderbird applications through 1970, offering smooth torque over the 427’s raw power, exactly what luxury-oriented Ford buyers wanted. Both the standard and Cobra Jet 428 were replaced by the 429 cubic inch 385-series engine starting in 1969 for most applications.

When Replacement Becomes Necessary

• Knock under load, rod or main bearing wear on high-mileage FE engines
• Blue smoke on startup or under acceleration, worn valve seals on aged FE cylinder heads
• Loss of compression on one or more cylinders, ring wear or scored cylinder walls
• Oil leaks at the front timing cover, a documented chronic seep point on FE engines
• Overheating, the FE runs warm and aged cooling passages restrict flow
• Low oil pressure at idle after warm-up, bearing wear on high-mileage units

Known Issues We Document Before Shipping

• External balance requirement: the 428 FE is externally balanced, different from many other FE engines. The harmonic balancer and flexplate or flywheel must be 428-specific. Using components from a 390 or other FE engine without correct balance will cause severe vibration. We flag this on every order.
• Timing cover oil leaks: the FE timing cover gasket area is a chronic seep point on all FE engines. We inspect and report on timing cover condition before shipping.
• Standard 428 versus Cobra Jet head distinction: the standard Q-code 428 uses regular FE production heads with 2.04-inch intake valves. The Cobra Jet uses 427-style large-port heads with 2.09-inch intake valves. These require different intake manifolds. We document which head type is on the unit before shipping.
• Police Interceptor identification: the P-code 428 Police Interceptor used an aluminum intake manifold, more aggressive camshaft, and (in 1966 only) solid lifters. Verifying a genuine PI unit requires casting numbers and head identification. We document casting numbers for restoration buyers.
• Flat-tappet cam ZDDP requirement: all FE engines use flat-tappet camshafts. Modern low-zinc oils accelerate cam lobe wear. ZDDP additive is essential for sustained operation.

428 FE Variants by Year and Application

Critical buyer information across the 1966 to 1970 production run:

What Ships and What Does Not

Direct-Fit Vehicle Applications

Used OEM Versus Specialist Rebuild

For a Galaxie 500 7-Litre, Thunderbird, full-size Mercury, or Police Interceptor restoration on a reasonable budget, a documented used 428 with variant confirmed and casting numbers documented is the cost-effective path. For a Cobra Jet restoration or a high-performance build targeting 500-plus hp, a specialist rebuild with refreshed heads, aluminum heads (Edelbrock Performer RPM or similar), and supporting hardware is the better investment. Specialist 428 FE rebuilds typically run $8,500 to $14,000-plus from established Ford FE specialist shops.

Inspection Workflow

• Compression test logged across all 8 cylinders with uniformity reported
• Variant identified: standard Q-code, Police Interceptor P-code, or Cobra Jet
• Block casting number and date code documented
• Head casting numbers documented (large-port Cobra Jet versus standard 2.04-valve)
• External balance configuration noted
• Timing cover condition assessed for seep points
• Valvetrain condition checked for flat-tappet cam wear indicators
• External oil leak survey at valve covers, timing cover, oil pan

Pre-Purchase Buyer Notes

• Confirm external balance components: the 428 FE requires 428-specific harmonic balancer and flexplate or flywheel. Mixing components from a 390 or other FE engine causes severe vibration and can damage main bearings. We flag this on every order.
• Match intake manifold to head type: the standard 428 uses regular FE intakes; the Cobra Jet uses 427-style intakes with larger ports and different bolt patterns. Wrong intake will not bolt to the heads.
• Use ZDDP additive: all FE engines use flat-tappet cams requiring high-zinc oil. Modern low-zinc oils accelerate cam lobe wear. ZDDP additive is essential.
• Plan timing cover service at install: the FE timing cover is a documented chronic seep point. Refreshing the timing cover gasket and seal at installation is cheap insurance.
• Confirm casting numbers for restoration: show-quality FE restorations require correct casting numbers matching production date codes. We document this on every unit.

Why Buy From Part Nests

• Variant confirmed: standard Q-code, Police Interceptor P-code, or Cobra Jet documented before payment
• External balance requirement specifically disclosed on every order
• Block and head casting numbers documented
• Head type identified: standard versus 427-style large-port (Cobra Jet)
• Timing cover seep condition assessed
• All 8 cylinders compression-tested with uniformity reported
• No core return required
• Free freight delivery to every state
• 15 day replacement warranty against internal defects
• Call (240) 306-7051 to speak with someone who knows 428 standard versus Cobra Jet variant differences, external balance component matching, and FE flat-tappet cam service requirements