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The intake manifold to head bolt pattern was redesigned to improve gasket integrity—four of the center intake manifold bolts were drilled at 72° instead of 90° for the cast iron cylinder heads. Changes to the valve covers were also made. Ribbing was added to the top of the valve covers to increase surface area, acting as a heat sink.
[3] 1987 saw new center bolt valve covers and hydraulic roller lifters. [4] For the 1992 model year, the 4.3 L (262 cu in) had its block design modified to allow a balance shaft to be installed. [5] Even though the 4.3 L (262 cu in) is an even-fire V6, the 90° block layout is not ideal for smoothness.
Heads featured a new raised lip for improved valve cover sealing and the two center intake bolts were changed from 90-degree orientation to 72 degrees. G92 and L98 cars got the Borg-Warner HD 7.75-inch (197 mm) four-pinion rear end, produced for GM's Holden of Australia (Firebird WS6 cars went to this unit in 1986). These units can be ...
These included the introduction of new colors such as "Hugger Orange". The fuel tanks were now made of plastic with a 16.8 gallon capacity instead of preceding metal units which had a capacity of 15.5 gallons. The valve covers on the LS1 powered models were switched to a center-bolt style, and traction control now became available on the V6 models.
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 ...
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.