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The 351 Windsor engine is a member of the Ford Small Block Engine family. It was introduced in 1969 and named for its assembly plant in Ontario, Canada. At the time, though, it was only referred to as the "351 Engine". The Windsor designation was used later to distinguish it from the 351 Cleveland Engine, introduced in 1970.

It has a 4.00" bore and 3.50" stroke and was a response to increasing small block engine sizes at the time. The engine is similar in appearance to the 302 Engine but it has a taller block deck height to accommodate the longer stroke. In 1969 it was available in 2v (H code) and 4v (M code) configurations.

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Windsor vs. Cleveland

In 1970, the 351 Windsor engine was replaced with the new 351 Cleveland Engine. However, because supply of the new engines could not keep up with production demand, some 1970 Mustangs ordered with the 351-2v option received the 351 Windsor engine. All 1970 Mustangs ordered with the 351-4v engine option received 351 Cleveland Engines.

There is no way to distinguish which 351-2v engine a vehicle received in 1970, based on the engine code in the VIN. However, Ford did track this information in their production database and the information is available via a Marti Report.

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1969-1970 351 2v (H code)

GENERAL SPECIFICATIONS
Type 8-Cylinder, 90V, Overhead Valve
Displacement 351CI (5.8L)
Bore and Stroke 4.00" x 3.00"
Compression Ratio 9.5 to 1
Brake Horsepower250 @ 4600rpm
Maximum Torque355 @ 4600rpm
Valve LiftersHydraulic


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1969 351 4v (M code)

GENERAL SPECIFICATIONS
Type 8-Cylinder, 90V, Overhead Valve
Displacement 351CI (5.8L)
Bore and Stroke 4.00" x 3.00"
Compression Ratio 10.7 to 1
Brake Horsepower290 @ 4800rpm
Maximum Torque385 @ 4800rpm
Valve LiftersHydraulic

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