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The 351W had larger main bearing caps, thicker and longer connecting rods, and a distinct firing order (1-3-7-2-6-5-4-8 versus the usual 1-5-4-2-6-3-7-8, a means to move the unacceptable "noise" of the consecutively-firing adjacent front cylinders to the sturdier rear part of the engine block all while reducing excessive main bearing load ...
For this inline-4 engine, 1-3-4-2 could be a valid firing order. The firing order of an internal combustion engine is the sequence of ignition for the cylinders. In a spark ignition (e.g. gasoline/petrol) engine, the firing order corresponds to the order in which the spark plugs are operated. In a diesel engine, the firing order corresponds to ...
Ford's Windsor class engines--302W and 351W--have different firing orders. Ford reversed the position of the #2 and #3 crankpins location when they built the 351W. Why? They observed that the firing order used on the 302W caused unacceptably high peak stresses at the #3 and #4 crankpins and #4 main bearing when using that sequence. Reversing ...
Pressure in cylinder pattern in dependence on ignition timing: (a) - misfire, (b) too soon, (c) optimal, (d) too late. In a spark ignition internal combustion engine, ignition timing is the timing, relative to the current piston position and crankshaft angle, of the release of a spark in the combustion chamber near the end of the compression stroke.
Around 1985~1986, Ford changed the 302 to the 351W firing order, so it's important when changing camshafts to know the right firing order for the engine. The FO for the 302 HO was actually changed a bit earlier. Around 1982 would be more accurate. Another thing you need to consider is that the firing order only changed on HO engines!
The Ford 400 engine was based on the 351 Cleveland but had a half-inch longer stroke than the 351 Cleveland. The 400 had "square" proportions, with a 4.0 in (102 mm) bore and stroke. Ford called the engine a "400" but in actuality it displaced 402.1 cu in (6.6 L; 6,590 cc). To accommodate the longer stroke, Ford engineers increased the block ...
The first Y-block on Ford automobiles and F100 trucks was the 239 cu in (3,910 cc) version as released in 1954 with EBU casting numbers. The Y-block was the same displacement as the old Ford Flathead V8 that it replaced but with a bigger bore and a shorter stroke (3.5 x 3.1 in).
This engine had seven main bearings, and can be identified by the five core plugs on the side of the block. The block uses a low-mount starter and six bellhousing bolts, sharing its bellhousing pattern with the 302 and 351 Windsor V8s, late (1965–68) 289, early 4.6 L V8, and the 240 and 300 inline-six. Production of the 250 ended in 1980.