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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.
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.
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 ...
The Oldsmobile engine was very similar to the Buick engine, but not identical: it had larger wedge combustion chambers with flat-topped (rather than domed) pistons, six bolts rather than five per cylinder head, and slightly larger intake valves; the valves were actuated by shaft-mounted rocker arms like the Buick and Pontiac versions, but the ...
It was a solid lifter motor featuring a forged steel crankshaft, 4-bolt main block, 11:1 compression ratio, impact extruded pistons, high-lift camshaft, low-restriction exhaust, aluminum intake manifold, 4-barrel carburetor, and finned aluminum rocker covers. The new engine, making up less than 8% of production, could not be ordered with air ...