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ZR1, (or ZR-1), is a designation that has been used on several different generational models of the Chevrolet Corvette. For the 3rd generation (C3) , the ZR1 & ZR2 were special engine packages. Only 53 of these packages were optioned during the 1970 to 1972 model years.
The 427 big-block was enlarged to 454 cu in (7.44 L) with a 390 hp (291 kW; 395 PS) rating. The ZR-1 special package was an option available on the 1970 through 1972 model years, and included the LT-1 engine combined with special racing equipment. Only 53 ZR-1's were built. [45]
Only 53 1970-1972 ZR1's were built (25 in 1970, including 8 convertibles, 8 in 1971, and 20 in 1972). [ 51 ] The ZR2 special engine package was a $1,747.00 (1 year only) option originally planned for 1970, [ 52 ] but officially released in 1971.
Chevy engineers surely never predicted the C3 Corvette's ZR-1 option package would evolve into the 1064-hp twin-turbocharged 2025 Corvette ZR1 of today.
While the ZR1 nameplate first arrived as a go-fast package for the early C3 Corvettes, its proper introduction to the general public came during the Corvette’s fourth-generation.
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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.
Before that, the C6 Corvette ZR1 featured a 638-hp supercharged LS9 6.2-liter V-8, which was a sizable step up from the C4 ZR1. That top-spec Vette had a comparatively humble naturally aspirated ...
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