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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. Between 1970 and 1972, only 53 ZRs were produced, making it one of the rarest Corvettes.
The LT1 uses a new engine block, cylinder head, timing cover, water pump, intake manifold and accessory brackets. The harmonic damper also does not interchange; it is a unique damper/pulley assembly. Engine mounts and bell housing bolt pattern remain the same, permitting a newer engine to be readily swapped into an older vehicle.
General Motors has produced three different engines called LT1: 1970–1972 LT-1 – Chevrolet Generation I Small-Block; 1992–1997 LT1 – GM Generation II Small-Block;
The LT1 V8 had a power output of 275 hp (205 kW). The high performance variant of the Z28 called the Z28 SS was not introduced until 1996 in collaboration with SLP Engineering with the engine tuned to have a power output of 305 hp (227 kW). 17-inch wheels also became available as an option. [13]
Engines were detuned with reduced compression ratios to tolerate lower octane fuel. The small blocks available were the 350 cu in (5.7 L) base engine, which dropped to 270 hp (201 kW), and the high performance LT1, now listed at 330 hp (246 kW). The LS5 454 cu in (7.4 L) motor was carried over and produced 365 hp (272 kW).
The 6.2 L; 376.0 cu in (6,162 cc) EcoTec3 is a Generation V small-block V8 truck engine (VIN code "J"). The L86 is an LT1 engine modified for truck use with a compression ratio of 11.5 to 1. In 2019, GM introduced the L87 as the successor to the L86. Power and torque remain the same, but whereas the L86's "Active Fuel Management" alternates ...