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This block is one of three displacements, 302/327/350, that underwent a crankshaft bearing diameter transformation for 1968 when the rod-journal size was increased from the 2 in (50.8 mm) diameter small-journal to a 2.1 in (53.3 mm) large-journal and a main-journal size that was increased from 2.3 in (58.4 mm) to 2.45 in (62.2 mm).
A crankpin or crank pin, also known as a rod bearing journal, [1] is a mechanical device in an engine which connects the crankshaft to the connecting rod for each cylinder. It has a cylindrical surface, to allow the crankpin to rotate relative to the "big end" of the connecting rod. [2] [3] [4]
This engine replaced the 250 cu in (4.1 L) straight-six in full-size Chevrolets and Camaros as the base six-cylinder engine. Additionally, the intermediate Chevrolet Malibu and Monte Carlo also used the 229 cu in (3.8 L) as a replacement for both the 200 cu in (3.3 L) V6 and the 231 cu in (3.8 L) Buick V6 .
Effectively, production Pontiac V8 blocks were externally the same size (326-455) sharing the same connecting rod length 6.625 in (168.3 mm) and journal size of 2.249" (except for the later short deck 301 and 265 produced in the late 1970s and early 1980s before Pontiac adopted universal GM engines).
The number of main bearings is primarily determined by the overall load factor and maximum engine speed. [1] Increasing the number of bearings in an engine will generally increase the size and cost of the engine, but also reduces bending stress and deflection caused by the distance from the crank pins to the nearest bearings.
While the engine block is the same size as the V8, the cylinder heads are shortened versions of the V8 heads. It is made on the same production line as the AJ133. The AJ126 is a 3.0 L; 182.8 cu in (2,995 cc) 90° petrol V6, having a bore and stroke of 84.5 mm × 89 mm (3.33 in × 3.50 in) with a 10.5:1 compression ratio.
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The heavier connecting rods and the removal of the centre counterweight on the stock 428 Cobra Jet crankshaft (1UA), required an external weight on the snout of the crankshaft for balancing. A 428 Super Cobra Jet engine with oil cooler was standard equipment when the "Drag Pack" option (which came when selecting either a 3.91 or 4.30 rear end ...