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The pistons used in the 4.3 L V8 were the same as the Vortec 5000's, but longer 5.94 in (150.9 mm) connecting rods were used to compensate for the shorter stroke. The L99 featured updated Generation II block architecture, and is externally identical to the larger 5.7 L LT1 Generation II V8.
Its design shared much with the L29 454, but with the addition of forged pistons and crankshaft, and coil near plug ignition. It had slightly reduced power compared to the L29 454 and used a different PCM. The L21 was paired with the early 4-speed Allison automatic transmission or manual transmission, depending on the application. L21 applications:
LSX376-B15 (part number 19299306) includes forged steel crankshaft, forged powdered metal I-beam rods (both the crankshaft and rods from the LSA engine), forged aluminum pistons (9.0:1 compression), and high-flow rectangular-port six-bolt LSX-LS3 heads for supercharged and turbocharged combinations producing up to 15 psi (1.0 bar) of boost and ...
The pistons were a pent-roof type, and the combustion chamber shape approximated a hemisphere. The compression ratio was 10.5:1. The compression ratio was 10.5:1. While claimed output was as high as 240 hp (179.0 kW) at 7200 rpm, none of the three prototype engines developed more than 190 hp (141.7 kW) at 5700 rpm and 170 lb⋅ft (230 N⋅m) at ...
Gone were the 4-bolt main bearing engine block, forged crank, forged pistons, big valve heads, and performance camshaft. Still, the LM1 was the most powerful Camaro engine and only available in the Z28 model. The engine came with better tuned intake and exhaust, shared with most Chevy passenger cars.
Chevrolet introduced the 350 cu in (5.7 L) LT-1 in 1970, making it available in both the Corvette and Camaro. It was an optional engine in the Corvette, and available as part of the high-performance ZR-1 option.
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