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In a piston engine, the bore ... the deck height is increased to accommodate a longer stroke, etc. but in general if the bore pitch is the same, the engines are ...
With a longer stroke, the compression ratio became excessively high with the 351-2V heads and flat top pistons. Ford engineers reduced the compression ratio by using a piston with a compression height that was too short and this led to an excessive deck clearance of 0.067" to .080" compared to a 351-2V at 0.035" .
Deck height choices include 9.2 in (234 mm) and 9.5 in (241 mm). Maximum displacements are 4.25 in (108 mm) stroke and 4.125 in (105 mm) bore. The resulting maximum displacement is 454.38 cu in (7,446 cc). The uncross-drilled block with increased bore capacity became available from the third quarter of 2009.
Chrysler increased the bore size of the 383 to create the 400. Its bore of 4.342-inch (110.3 mm) was the largest used in any production Chrysler V8 at the date of its introduction. All parts except for the pistons were interchangeable between the 383 and 400. Crankshafts were made of cast iron.
Deck height for the 4.6 block is 8.937 in (227.0 mm) and connecting rod length is 5.933 in (150.7 mm) center to center, giving the 4.6 L a 1.67:1 rod to stroke ratio. Cylinder bore spacing measures 3.937 in (100.0 mm), which is common to all members of the Modular engine family.
The Ford FE's deck height of 10.17 in (258.3 mm) was lower than that of the Chrysler 392 at 10.87 in (276.1 mm). For comparison, the 426 Hemi has a deck height of 10.72 in (272.3 mm) and bore spacing of 4.8 in (121.9 mm); both Chrysler Hemis have decks more than 0.5 in (12.7 mm) taller than the FE.
There are actually two short blocks which are used for the entire series. The distinction between them was the cylinder block deck height. The one used for B16 and B17 engines (except for B16B) has a deck height of 203.9 mm (8.03 in) while the short block used for B16B, B18 and B20 engines has a deck height of 212 mm (8.3 in). [5]
The stroke and deck height on the 290 and 343 were increased by 0.16 in (4.06 mm) on both engines, becoming the 304 cu in (5.0 L) and 360 cu in (5.9 L), respectively. The 1970 AMX 390 remained at the same displacement by using a special connecting rod and piston for this year only.