About This Engine

The Ford 351 Cleveland is one of the most misunderstood and most sought-after Ford performance engines ever built. Produced from 1970 to 1974 at Ford's Cleveland, Ohio engine plant, it shares only its 351 cubic inch displacement and bore-and-stroke dimensions with the 351 Windsor- everything else is different. The Cleveland uses canted valves similar to Ford's 429-460 big-block family, allowing larger valve diameters and dramatically superior port flow compared to any Windsor head. The 4V version with closed-chamber heads and large ports was Ford's answer to the big-block muscle car engines of its era.

The Boss 351 of 1971 was the pinnacle of the Cleveland family- the only one-year-only factory high-performance Cleveland built with 11.7:1 compression, solid lifters, 4-bolt main caps, forged pistons, and a 750 cfm spread-bore Holley carburetor. Rated at 330 hp but widely considered underrated, the Boss 351 ran the quarter mile in the low 14-second range- performance equivalent to the 429 Cobra Jet. Only 1,806 Boss 351 Mustangs were produced, making it one of the rarest factory Mustangs.

The 351 Cleveland continued in Australian Ford Falcon production through 1982- long after US production ended in 1974. Australian 351C units are a significant source of usable Cleveland cores today and are generally well-regarded for their condition due to the Australian climate and maintenance culture.

Signs You Need a Replacement Engine

• Loss of compression on one or more cylinders- ring wear or scored cylinder walls on high-mileage units
• Knock under load- rod or main bearing wear
• Blue smoke on startup- valve stem seal deterioration on aged Cleveland heads
• Overheating- the 351C runs warm and aged cooling passages can restrict flow
• Oil leaks at the timing cover- a documented Cleveland seep point

Known Problems With This Engine

• 2V vs 4V intake incompatibility: The 351C 2V head uses a different intake manifold bolt pattern from the 351C 4V head. They are not interchangeable. A 4V intake will not bolt onto 2V heads and vice versa. We document and confirm head type before every order.
• 4-bolt main availability: Standard 351C blocks have 2-bolt main caps. Only the Boss 351, 351 Cobra Jet (Q-code), and 351 HO (R-code 1972) have 4-bolt caps. If 4-bolt mains are required, specify when calling.
• Cleveland vs Windsor confusion: Despite identical displacement, these engines share no heads, no intake manifolds, and in some applications use different bellhousing patterns. A Windsor intake will not fit a Cleveland block. We verify which engine the buyer needs before every order.
• Australian vs US units: Australian 351C engines are generally available in later (post-1970) configurations using 2V open-chamber heads tuned for lower-octane fuel. They are reliable cores but not performance equivalents of the original US 4V units.
• Limited core supply: The 351C was only produced for 5 years in the US. Clean cores become harder to source every year.

Ford 351 Cleveland Variants by Code and Configuration

The 351 Cleveland was produced in several distinct variants with significantly different specifications:

Common Casting Numbers

Casting number and date code documented on every unit before shipping.

What Is Included- What Is Not Included

Vehicle Compatibility- Direct Fit

The Ford 351 Cleveland was factory installed in the following vehicles:

The 351 Cleveland uses the same standard small block Ford bellhousing bolt pattern as the 289, 302, and 351 Windsor, making it compatible with the same transmissions. However, motor mount locations may differ slightly on some applications. Important: The 351C intake manifold bolt pattern is completely different from the 351W- a Windsor intake will not fit a Cleveland block and vice versa.

Transmission compatibility: Ford C6 Automatic- most common and strongest pairing for 4V and Boss 351 | Ford C4- lighter duty | Ford Top Loader 4-speed- performance manual applications.

Not sure if this fits? Call (240) 301-0095. We verify fitment before every order ships.

Common Names and Search Terms

Used OEM vs Rebuilt- Which Is Right for You?

Used OEM is the right choice for a Mustang, Torino, or Falcon restoration- particularly where a compression-tested engine with documented head type and variant is the foundation. Cleveland cores are genuinely limited- a tested unit is a find.

A professionally rebuilt Cleveland from a Ford 335-series specialist makes sense for a show car or high-performance build. Boss 351 rebuilds from specialists typically run $7,000 to $12,000 or more. Call us to discuss current inventory.

Condition and Inspection Process

• Compression test across all 8 cylinders- pressure per cylinder recorded
• Head type confirmed- 2V open-chamber or 4V closed-chamber documented before shipping
• Main cap configuration confirmed- 2-bolt or 4-bolt noted
• Casting number documented- year and block family confirmed
• Visual inspection for cracks, scored journals, stripped threads
• Timing cover and gasket surfaces inspected for seepage

Mileage varies by unit. Where available we provide it. Where it cannot be confirmed, we disclose this before your order is placed.

Buyer Tips- What to Know Before You Order

• 2V vs 4V intake: Before ordering, confirm which head type your application requires. The 2V and 4V heads use completely different intake manifold bolt patterns. We confirm head type before every order- make sure your intake manifold matches.
• Cleveland vs Windsor: Verify which 351 is in your vehicle before ordering. The easiest check is the intake manifold bolt pattern- Cleveland and Windsor patterns are completely different. If unsure, call us and we will walk you through the identification.
• Boss 351 identification: A genuine Boss 351 has a specific R-code casting, 4-bolt main caps, solid lifters, and adjustable rocker arms. We document all of these for any Boss 351 unit in inventory.
• Australian vs US heads: Australian 351C engines typically use 2V open-chamber heads with lower compression. They are good replacement cores but not performance equivalents of original US 4V units.
• Cooling system: The 351C runs warm. Ensure your cooling system is in excellent condition- particularly the water pump and thermostat.

Why Buy From Vaz Auto Solutions

• Head type confirmed before you pay- 2V or 4V documented, prevents intake manifold incompatibility
• Casting number on record- year and block family confirmed
• Compression tested across all 8 cylinders- results shared before order confirmed
• Cleveland vs Windsor distinction verified before every order
• No core charge- keep your old engine
• Free freight pallet delivery to all 50 states
• 15 day replacement warranty on internal engine defects
• Call (240) 301-0095- speak with someone who understands Cleveland variants and the 2V vs 4V distinction