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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).
1992–1997 GM LT "Generation II" small-block V8; 1997–2020 GM LS small-block V8 (referred to as Generation III or IV depending on type) 2014–present GM LT Generation V small-block V8 (Also called Ecotec3 V8) 2018–2020 Cadillac Blackwing twin-turbo V8; 2023–present Chevrolet Gemini DOHC V8; Cadillac Twelve engine
Along with the increased bore spacing, the new 3.6 L DI V6 has larger bores than before, growing from 94 mm (3.701 in) to 95 mm (3.740 in) with the same 85.8 mm (3.378 in) stroke as the 3.0L LGW, for a displacement of 3.6 L (3,649 cc). Intake and exhaust valves are also increased in size along with other changes to the cylinder head. [21]
The 90° V6 engine uses the same transmission bellhousing pattern as the Chevrolet small-block V8 engine. The oil pan dipstick is located on the passenger side above the oil pan rail; this design was phased in on both the 90° V6 and Small Block Chevrolet assembly lines (for engines manufactured after 1979) sharing the same casting dies.
1950–1973 Powerglide — 2-speed Chevrolet (also used by Pontiac, Holden, Vauxhall and Opel). 1953-1955 Twin Turbine Dynaflow: the 1st redesign w/ 2 turbines & single stator. 1956-1957 Twin Turbine 2 Dynaflow: the 2nd redesign w/ 2 turbines & variable-pitch stator.
It featured a smaller bore of 3 + 3 ⁄ 4 in (95.3 mm) coupled with the same 3 in (76.2 mm) stroke of the 301 (same bore and stroke used by Chevrolet when the first small block motor was introduced in 1955). It produced 120 hp (89 kW) After 1981, the Pontiac V8 was replaced entirely by the GM "corporate" V8's from Chevrolet and Oldsmobile.
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