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In the past when it was called GM-Saginaw Product Company (SPC) a cloverleaf casting symbol mark was cast onto the iron component. [ 1 ] [ 2 ] The location has been the primary source of engine block and cylinder heads for all of GM's engines, to include Oldsmobile, Pontiac, Cadillac, Chevrolet, Buick and GMC for most of the 20th century.
A Silver streak 8 in a 1949 Pontiac Streamliner - note the large intake silencer leading to an oil-bath air cleaner on the left side of the engine. The Pontiac straight-8 engine is an inline eight-cylinder automobile engine produced by Pontiac from 1933 to 1954.
GM stopped installing big-block V8s in the Silverado HD trucks when the GMT800 series was discontinued in 2007. Vortec 8100s were built at GM's Tonawanda Engine plant while the engine block and cylinder head were cast at Saginaw Metal Casting Operations. The last L18 was manufactured in December 2009. L18 applications:
In 1969 the 350 HO was upgraded again with the addition of the 400 HO cam, commonly referred to by enthusiasts as the 068 cam. Also added was the #48 casting number heads with a 68 cc (4.15 cu in) chamber for higher compression, along with larger 2.11 and 1.77 in (54 and 45 mm) valves.
The GMC straight-6 engine was a series of gasoline-powered straight-six engines introduced in the 1939 model year by the GMC Trucks division of General Motors.Prior to the introduction of this new engine design GMC trucks had been powered by straight-six engines designed by the Buick, Pontiac and Oldsmobile divisions of GM.
It contributed to the casting needs provided by Saginaw Metal Casting Operations and Defiance Foundry. After the Corvair was cancelled the factory switched to casting the engine block and cylinder heads for the Chevrolet 2300 engine used in the Chevrolet Vega GM H platform , the Iron Duke engine used in both the GM N platform and GM L platform ...
GM also made extensive use of economies of scale for the LS: with the exception of the 4.8L and 7.0L engines, all variants used the same 3.622" stroke (with most of those variants using the same basic crankshaft casting), the 4.8L and 5.3L variants utilized the same block casting, and several variants used the same length connecting rod. [39]
These engines vary in displacement between 2.8 and 3.4 litres (2,837 and 3,350 cc) and have a cast-iron block and either cast-iron or aluminum heads. Production of these engines began in 1980 and ended in 2005 in the U.S., with production continued in China until 2010. This engine family was the basis for the GM High Value engine family.