Cleveland engines share a bellhousing bolt pattern with the Windsor family. 351M engines use the bell housing bolt pattern of Ford’s 385 series large blocks. Due to a higher deck, the 351M’s intake manifold is wider than the 351C.
On a Cleveland/Modified engine, the radiator hose (and thermostat housing) protrudes vertically directly from the top of the engine block. Windsor engines have the radiator hose and thermostat installed in the intake manifold where it exits at the front of the engine.
Performing the swap requires some minor machining and a special intake manifold to connect the Cleveland-style heads to the Windsor block.
There are several external differences that can help distinguish between the 351W engine and the 351C and M engines: The 351W has three bolts that attach the rocker covers on the exhaust manifold side; the 351C,M has four. The 351W has the timing cover bolted to the block.
There really is no such thing as a 302 Cleveland. The Boss 302 uses a regular 302 block (small block) but uses the Cleveland-style heads with beveled valves and larger valve covers. Subject: 302 Windsor or Cleveland? There really isn’t a 302 Cleveland.
While a stock 351C is a reliable engine, once extra power is added they become more of a problem. The thin cylinder walls create potential reliability issues and block cracks from overboring, and the oil system is inadequate without modifications.
On a Cleveland/Modified engine, the radiator hose (and thermostat housing) protrudes vertically directly from the top of the engine block. On Windsor engines, the radiator hose and thermostat are installed in the intake manifold, where it exits at the front of the engine.
Fitting Windsor heads to a Cleveland engine is possible, but you will need a custom intake manifold. Fitting 351C heads to a 351W also requires a dedicated but available intake manifold.
By the way; the Windsor heads will fit any 302, you must also use a 302 inlet, the 351 inlet is too wide and will not work on a 302 block…..
By far the best factory 351C head is the Ford Australia 4V Casting which combines the sweet combination of the 351C 4V wedge chamber with the smaller 2V ports for great low-mid range torque Has. It remains the finest factory head ever produced by Ford for this mill.
The BOSS 302 heads are known as “Cleveland style” heads because they are based on the head developed for the 351 Cleveland engine.
The main difference between the blocks was the deck height . The 351 blocks were up to 1,300 inches taller to allow for a longer stroke. You can tell the difference fairly easily by looking at the front of the engine.
The 351 Cleveland began production in July 1969 for the 1970 model year. Its actual displacement was 351.9 cubic inches (5,766 cc).
With a factory output of 330hp @ 5,400rpm, this new engine was the highest performance this engine family would see. Other 351 performance engines would follow, but none would match the Boss 351.
The 351C was replaced by the 351M in 1975. The 351M was essentially a wrecked version of the 400 c.i.d. Engine. The 351M and 400 models were available in cars through 1979. They were also offered in trucks until 1982.
Version was ordered from the three available Cleveland options, but by 1973 only the base H code and a modest Q code remained on the build sheet. Not only was the 351C sold in a Mustang wrapper, it was also available in the Ford Torino, Mercury Montego and Mercury Cougar.
The biggest physical difference between the 2V and 4V Cleveland heads is the huge intake and exhaust ports on the 4V heads. There just isn’t enough material around the smaller 2V ports to fit them for 4V port dimensions.
A large part of the racing success can be attributed to the amazing little engine. At just 290 horsepower, the Boss 302 featured revolutionary new canted-valve Cleveland heads. The combination of minimal displacement and massive head flow produced a race-ready, high-revving screamer that absolutely excelled on the track.
The 302 was manufactured in Windsor from 1968 to 1978.
The 1971 Boss 351 was a replacement for the already rowdy and famous Boss 302. This car, so named for its 302 cubic inch engine, gave way to the 351 with its larger Cleveland V-8. The 351 cubic inch engine produced 330 hp, 40 more than the Boss 302 could do.
While the latest generation of 351 Windsors typically produce around 180-220hp from the factory, a Windsor can be upgraded with the addition of a new set of heads, a larger cam and some other aftermarket parts Series stroke can be easily obtained at around 350-400 hp.
This is the largest stroker combo available for the Ford 351 Cleveland, using a 4,000-inch stroke to achieve 408 cubic inches of displacement. This configuration will be heavier on the bottom end than the others with less emphasis on peak performance.
The Clevor is similar to the Boss 302. It consists of a Windsor block fitted with Cleveland cylinder heads. It is not restricted to any specific displacement and can be built on a 302 or 351W platform. Unlike before, many components are available off the shelf for the Clevor.
Ford 351W engines are virtually bulletproof. The blocks, even on the 1975 and later models, are very strong and will not cause any problems until serious power is added. The rods, pistons and other internal components are also rock solid. Overall, the 351 Windsor is a robust engine and is built to take a beating.