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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 ...
[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.
The new hydraulic lifter motor featured a forged steel crankshaft, running in a four-bolt main block, with special rods, impact extruded pistons, a higher lift camshaft, mated to special heads with larger valves running at a higher 9:1 compression, and included finned aluminum valve covers to help dissipate heat.
Hardened valve seats further increased reliability and helped allow these engines to last much longer than the earlier versions, even without the protection previously provided by leaded fuel. 1974 was the last year of the 454 in the Corvette, although the Chevelle offered it in the first half of the 1975 model year. It was also available in ...
The C4 Corvette represented a clean break from the Zora Arkus-Duntov-designed C3, with a completely new chassis and sleeker, more modern but still evolutionary styling. It was the work of a team under chief Corvette designer Dave McLellan, who'd taken over from Duntov in 1975 — under the design direction of Irv Rybicki.
The car that became the Corvette Super Sport began as a regular production 1956 C1 Corvette with Vehicle Identification Number (VIN) E56S001589. [2] With original equipment including a 265 cu in (4.3 L) Chevrolet small-block V8 engine, power windows and a hydraulic folding top, the car was a display model in the GM Building in Detroit.