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The engine block was revised with structural reinforcing ribs up front eliminating the two freeze plugs (on the front and back) along with an alloy oil pan (for the S-10, Blazer, and Jimmy). The 1996+ cast aluminum oil pan has 12 bolts where a 16-bolt oil pan from the earlier 4.3 does not interchange.
These modifications include an additional bolt hole at the top of the pattern, and attachment points for cast oil pans to lower bellhousing extensions, to reduce NVH. GM metric pattern [ edit ]
In addition to the more refined cylinder heads, block casting reinforcements in the lifter galley and main bearing oil pan rail area, it had forged connecting rods with larger 7 ⁄ 16-inch-diameter (11 mm) bolts. Made with a provision for dry sump oiling, it truly was a racing engine, detuned for use in passenger cars.
The Turbo Hydra-Matic 700R4 can be identified by a rectangular-shaped oil pan with 16 bolt holes. [3] The tailshaft housing is held onto the main case by four bolts (the bolt spacing is similar to the THM350), and uses a square-cut o-ring seal, and not a gasket.
The head castings and valve head sizes from 1969 to 1976 were different, notably in passages for air injection and spark plug diameters (1969–1974 18 mm, 1975 and up 14 mm). From 1977 onward, the 351W shared the same head casting as the 302, differing only in bolt hole diameters (7/16 inch for the 302, 1/2 inch for the 351W).
The oil pan holds 15 US qt (14 L; ... with a turbine housing size of 1.15 A/R. For 1999, an air-to-air intercooler was added to cool the charged air from the turbo ...