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The flywheel bolt pattern for the later-production 3-liter does not interchange with the earlier 153 or 181 which uses the small-block and inline-six's 3.58-inch bolt-circle, and does not use the 1986–present one-piece rear-seal flywheels since the bolt pattern is larger.
Chevrolet 153 Inline 4 (Chevy II, pre-Iron-Duke - includes the Vortec 3000/181 industrial/marine crate motor) Detroit Diesel V8 6.2L and 6.5L; Duramax V8; Generation III V8s with modifications. These modifications include an additional bolt hole at the top of the pattern, and attachment points for cast oil pans to lower bellhousing extensions ...
Pontiac's 215 cu in (3.5 L) (1964–1965) was a smaller bore of 3.75 in (95.25 mm) version of the 230 cu in (3.8 L) Chevrolet straight-six engine. One oddity is the crankshaft bolt pattern; in lieu of the Chevrolet V8 bolt pattern (also shared with the rest of the third-generation six), the Pontiac V8 bolt pattern is used.
As these cars were originally designed for Chevrolet engines, the Iron Duke also used the Chevrolet bell housing bolt pattern, instead of the Buick-Oldsmobile-Pontiac V8 pattern. The following year use of the engine expanded to the Sunbird's Chevrolet and Oldsmobile twins, the Monza and Starfire .
The large-journal connecting rods were thicker (heavier) and used 3 ⁄ 8 in (9.5 mm) diameter cap-bolts to replace the small-journal's 11/32. 1968 blocks were made in 2-bolt and 4-bolt versions with the 4-bolt center-three main caps each fastened by two additional bolts which were supported by the addition of thicker crankcase main-web bulkheads.
This early version used a Chevrolet small block V8 bell housing bolt pattern. The 1984 and later model GM 151s used the corporate GM four-cylinder/small V6 bolt pattern (not used by AMC). Bore × Stroke 4.00" × 3.00" Compression Ratio 8.2:1; Horsepower (net) 82 hp (61 kW) @ 4,000 rpm; Torque (net) 125 lb⋅ft (169 N⋅m) @ 2,600 rpm
The Chevrolet Stovebolt engine is a straight-six engine made in two versions between 1929 and 1962 by the Chevrolet Division of General Motors.It replaced the company's 171-cubic-inch (2.8 L) inline-four as their sole engine offering from 1929 through 1954, and was the company's base engine starting in 1955 when it added the small block V8 to the lineup.
Bellhousing (aka bell-housing or bell) is a colloquial term for the component that aligns and connects the transmission of a vehicle to its engine, and which covers and protects the flywheel/clutch or flexplate/torque converter. [1] It derives its name from the bell-like shape that those internal components necessitate.
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