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The combined barrel-head was to be die-cast in aluminum with cast-iron cylinder liners. Each of these castings also included a channel for the pushrod path, doing away with the previous design's pushrod tubes. Valve covers were held in place by quick-release clips.
It was originally built to cast engine blocks and cylinder heads for the Chevrolet Turbo-Air 6 engine used in the Chevrolet Corvair from 1960 until 1969. [2] Aluminum parts included the block, heads, flywheel housing, crankcase cover, clutch housing, and pistons. 92 lb (41.7 kg) of aluminum was used in each engine.
Cast aluminum valve covers were fitted in place of stamped steel covers, featuring a screw-in filler cap. [41] Structural changes were carried out to the cylinder block to improve the integrity of the bores and the inlet manifold was changed to a single-piece design. [42]
The 1973–1974 L82 was a "performance" version of the 350 that still used the casting number 624 76cc chamber "2.02" heads but with a Rochester Quadra-jet 4bbl carburetor and dual-plane aluminum intake manifold, the earlier L46 350 hp (261 kW) 350 hydraulic-lifter cam, and 9.0:1 compression forged-aluminum pistons producing 250 hp (186 kW ...
The Chevrolet Vega is a subcompact automobile that was manufactured and marketed by GM's Chevrolet division from 1970 to 1977. Available in two-door hatchback, notchback, wagon, and sedan delivery body styles, all models were powered by an inline four-cylinder engine designed specifically for the Vega, with a lightweight, aluminum alloy cylinder block.
The head casting number (which can be viewed from the passenger side of the vehicle just in front of the valve cover) was 706. Some heads with this casting number would fail (but not all of them) as GM had different suppliers for the same head. The failure was due to undetected porosity around the oil drains in the head. [93]
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