What does 351M mean?

The 351M is a de-stroked 400, with the same tall deck height and large bearings, just a different crank and taller pistons to make up the compression ratio.

Is the 351M a good engine?

The M-series engines weren’t great performers in stock form, mainly due to low compression, dismal cam specs and tons of smog equipment. Luckily, it’s just a matter of bolt-ons to wake them up some. The motor seems in good shape, but looks like its only about 8:1 compression.

Is a 351M A big block?

The 351M/400 used the “Big Block” bellhousing bolt pattern.

What’s the difference between a 351W and 351M?

A 351W intake is about an inch to an inch and a half wider. The 351C (Cleveland) and 351M/400 (most commonly referred to as “Modified”) are very similar engines…they are the engines that make up the “335” series of Ford engines. Basically, the 351M/400 is a tall-deck version of a 351C.

Is a 351M the same as a 400?

To compensate for the shorter stroke the pistons for the 351M have a taller compression height so that it could use the same connecting rods as the 400. The result of the 351M using the longer 400 connecting rod was a higher connecting rod-to-stroke ratio of 1.88:1 than the 351C and 400’s of 1.65:1.

How do I identify a 351M engine?

The 351M and almost all 400’s have the large bell housing pattern like the 429/460. The only 100% positive way to tell if you have a 351M or 400 is to drop the oil pan and check the casting numbers on the crank. They should be on the side of the first counterweight. A 400 crank will have 5M, 5MA or 5MAB casting code.

How long will a 351M last?

Registered. might last 30k……might last 300k. a lot depends on how it was used and cared for over the years,.

What is a 351M Ford engine?

The 351M is part of the same Ford 335 V8 engine series as the 351 Cleveland. It’s based on the 400 Modified engine (see note on nomenclature in the opening paragraph), which was essentially a 351C with a longer stroke. Unlike the 351C however, the 400 blocks had the bellhousing bolt pattern of 385-series big blocks.

Will 351C heads fit a 351M?

4V Cleveland heads will fit on a 351M (Midland) engine, but the ports are very much larger than the 2V ports in the 351M heads.

How do I identify a 351M?

How can you tell the difference between a 351M and a 400m?

The only differences are the crank and the pistons in the 351M. Well, the 400m has a extra 50 cubic inches of displacement and the half inch of stroke on the crank gets that displacement.

When did the Ford 351M V8 come out?

351M production began for the 1975 model year and blocks were cast in the Michigan Casting Center or the Cleveland Foundry. The 351M was the last pushrod V8 block designed by Ford until the introduction of the 7.3-liter “Godzilla” engine for the Super Duty trucks in the model year 2020.

What’s the difference between a 351C and 351M engine?

The 351C would not work due to its small-block “Windsor” bellhousing bolt pattern. 400 cid. Bellhousing pattern same as 429/460 (to allow use of already existing heavy-duty transmissions. Crank stroke increased from 3.50″ to 4.00″ to gain 50 cid.

What does the m stand for on a Ford 351M?

Some claim the “M” stands for “Modified” – being modified from a 400-V8 with a shortened stroke – though others claim that the “M” refers to the Michigan Casting Center, where the 351M began production. Some say that the “M” designation has no official meaning and that it was just Ford’s way of distinguishing the 351M from the 351C and 351W.

What kind of carburetor does a Ford 351M have?

The 351M was only ever equipped with a 2-barrel carburetor and open chamber small port 2V cylinder heads. 351M production began for the 1975 model year and blocks were cast in the Michigan Casting Center or the Cleveland Foundry.