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1987 – The valve cover surfaces were changed so that the mounting lip was raised and the bolt location was moved from 4 bolts on the perimeter to 4 bolts along the centerline of the valve covers (this design debuted on the Corvette in 1986, and the Chevrolet 4.3L 90 degree V6 the year before). Also changed were the mounting angles of the two ...
The 4.3 L (262 cu in) V6 has a 4 in × 3.48 in (101.6 mm × 88.4 mm) bore and stroke, identical to the 350 cu in (5.7 L) Chevrolet V8 engine. To create a true even-fire engine, Chevrolet produced a crankshaft with 30-degree offsets between each rod pin. Consequently, rod journals were increased to a larger 2 + 1 ⁄ 4 inches (57.2 mm).
A rocker cover, (UK), or valve cover (elsewhere) is a cover that encloses the rocker arm in an internal combustion engine, bolting with a gasket seal to the engine head. Engines with more than one head (such as a V8 ) will have multiple rocker covers.
For 1987, the 9C1 Caprice changed little. The 350-4bbl engine received a boost in compression, roller lifters, and new center-bolt valve covers. [27] The 180 hp (134 kW) rating of this engine helped boost the Caprice's performance above its competition.
The 305 TPI equipped with automatic transmission came with 190 hp, while the Manual 305 TPI got a 215 hp (160 kW) rating. The 350 L98 gave a boost to 225 hp at 4,400 RPM and 330ftlb at 2,800 RPM. All V8 engines received hydraulic roller lifters and a new valve cover/head design. Valve covers featured new sealing and center bolts in the valve ...
Learning from problems with injectors in the previous LB7, GM changed the valve covers to allow access to the injectors without having to remove the valve covers, saving significant labor costs if injector replacement became necessary. The following trucks used the LLY engine: 2006-only Hummer H1 Alpha; Chevrolet Silverado/GMC Sierra 2500HD/3500
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