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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 engine was not the same "350" that had been part of the RPO Z28 Special Performance Package, the engine that had been shared with the Corvette LT-1 and L82 top-performance 350 engines from 1970 to 1974. Gone were the 4-bolt main bearing engine block, forged crank, forged pistons, big valve heads, and performance camshaft.
GM LT1 from a 1993 Chevrolet Camaro Z28. In 1991, GM created a new-generation small-block engine called the "LT1 350", distinct from the high-output Generation I LT1 of the 1970s. It displaced 5.7 L (350 cu in), and was a 2-valve pushrod design. The LT1 used a reverse-flow cooling system which cooled the cylinder heads first, maintaining lower ...
1993 Camaro Z/28 Indianapolis 500 pace car. The high performance Z/28 [9] [10] model came with rectangular dual exhaust tips to distinguish it from the base models. The Z/28 featured the 5.7 L OHV LT1 V8 engine having a power output of 275 hp (205 kW) and 325 lb⋅ft (441 N⋅m) of torque that had been introduced on the Corvette one year earlier.
A 350 MPFI (LT1) Small Block V-8 engine, which was introduced in the Corvette in 1992, was standard in the Z28. Optional equipment included all-speed traction control and a new six-speed T-56 manual transmission; the 4L60E 4-speed automatic transmission was standard on the Z28.
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 Berlinetta was no longer available this year, replaced with a new LT model, while the base Camaro and Z28 continued as before. 145 mph (233 km/h) speedometers became standard in the IROC-Zs and Z28s with tuned port injected engines while the carbureted Camaro models and 2.8 liter V6 retained the 85 m.p.h. speedometer.
A total of 69 ZL1 Camaros were produced. The engine alone cost over US$4,000—or more than an entire base V8 Camaro. Rated at 430 hp (321 kW) gross at 5200 rpm and 450 lb⋅ft (610 N⋅m) of torque at 4400 rpm/ [30] 376 hp (280 kW) SAE net "as installed", it could produce over 500 gross with exhaust changes and tuning. [25]