Chevrolet is famous for its small-block V8 engines, which combined a surprisingly steep power output with small and lightweight designs that fit into virtually any car. A powerful V8 married up with a lightweight car has always been the perfect recipe for speed, quickness, and stunning performance on the track and at the drag strip. The most popular and most heavily mass-produced small-block V8 engine is the Chevy 350. This engine has been documented as the most reliable engine of its kind and has been utilized in nearly every Chevy vehicle that’s large enough to house a V8.During the 1960s and 1970s, Chevrolet was prolific in the muscle car world. With so many varieties and muscle car names on the market, it might sound strange that a muscle car wearing the bowtie badge would be a rarity, but it was. Somehow, the most common and heavily utilized Chevrolet V8 engine became part of the story of a rare muscle car. With very few of these muscle cars ever created, the Chevy 350 was specially tuned for the muscle car, making for a winning combination. A Specialized Chevy 350 In The C3 Corvette ZR1 Creates A Rare Combination 1970 Chevrolet Corvette ZR1 The First Corvette ZR1 Is Also The Rarest The first time the Chevrolet Corvette wore the ZR1 badge was in 1970. This marked the start of American sports car owners looking at cars for some serious performance, thanks to the Muscle Car Era, which was going strong at the time. The measurement of performance was generally talked about in terms of the straight-line, quarter-mile drag race, but the ZR1 was built for much more. In fact, this car was built specifically for racing, with speed without compromise in mind.Mecum AuctionsThe LT-1 small-block V8 engines were produced for the Chevrolet Corvette ZR1 from 1970 to 1972, and only 53 versions of this car were produced. This makes it the rarest small-block V8 Chevrolet muscle car ever produced. While the dimensions were the same as the most common engine, 350 cu-in, or 5.7 liters, this LT-1 was built as a separate engine model.Via Mecum AuctionsThe split across the three model years for the Corvette ZR1 is: 25 were made in 1970, 8 in 1971, and 20 in 1972, totaling 53 for this incredible car. The ZR1 package with the LT-1 engine was a competition-only equipment package, which made it extremely limited. This is not to be confused with later LT engines, which were much more common. The rarity of the Corvette ZR1 for these three model years made for a desirable car that collectors search for at high-end auctions. The Rarest Of The C3 ZR1s HagertyOnly one C3 Corvette ZR1 was built as a convertible. This makes it the rarest of the rare cars built with the LT1 small-block V8 engine. This lone 1971 convertible belonged to Gary Konner for 25 years. Gary managed Malcolm Konnner Chevrolet in Paramus, NJ. The car was originally sold by Mancuso Chevrolet, located in Skokie, IL.Konner bought the car after taking it as a trade on a 1987 Callaway Corvette. This car was put on sale at auction through Hemmings in 2017, expected to sell for more than $120,000, but no official post-sale figures were published to confirm the final sale price.Regardless, the 1971 ZR1 Corvette Convertible is the rarest small-block V8-powered car of its kind, being the only one with a convertible body out of the eight that were built for that year. This makes it the rarest of the rarest, if that’s a thing. How Much Is The C3 Corvette ZR1 Worth Today? Mecum AuctionsWith rarity comes ridiculously high value. Looking at Classic.com, which compiles recent auction data, the average sale price for the C3 Corvette ZR1 is $212,667, and a 1972 model sold at Mecum Auctions on May 18, 2024, for $159,500. The average price and auction sale price show that collectors are willing to pay much more than the valuation listed for such a rare Corvette. As for the one-of-one Convertible? The auction price was never disclosed, but we can guesstimate it's worth well in the seven figures. Did The LT-1 Power Other Cars? Yes, the LT-1 engine was used in two other cars, but what made it special and rare in the Corvette ZR1 was its limited application. It was introduced in 1970 as a $1,221 option for the Corvette ZR1, which would cost a lot more today. In addition to the LT-1 engine, this package comes with a heavy-duty four-speed manual transmission, power brakes, an aluminum radiator, a revised suspension with special springs, shocks, stabilizer bars, and spindle-strut shafts.It was offered as a competition-focused option and was not available with power windows, power steering, air conditioning, a rear-window defogger, wheel covers, or a radio. Other than power steering, none of those items would be necessary on the track. C3 Corvette ZR1 Powertrain Specs And Performance Barrett-Jackson The LT-1 engine was specially tuned for the ZR1 Corvette, giving the car more power and performance. Many owners and experts believe the engine had a much higher output than was listed, which was common at the time. It doesn’t make sense for this car to have higher figures than listed since it was a competition package, but that was pretty much common practice in the 1960s and 1970s.The LT-1 engine is a 90-degree V8 small-block made of cast iron. It used an overhead valve/pushrod setup with two valves per cylinder and mechanical lifters on the 1970 LT-1 engines. The compression ratio in 1970 was 11.0:1, but this was reduced in later years thanks to the emissions/fuel requirements that went into effect during the 1970s.From the factory, the Corvette ZR1 was rated at 370 horsepower, which was reached at 6,000 rpm, and 380 lb-ft of torque, which was reached at 4,000 rpm. That already sounds impressive for a small-block V8 in 1970, but many drivers thought the engine produced much more power than listed.This version of the Corvette was capable of finishing a quarter-mile sprint in 14.4 seconds, making it fast and exciting on the track. The Corvette ZR1 posted a top speed of around 150 MPH and could reach 60 MPH in only 6.4 seconds. Vehicles Powered By The Chevy LT-1 Small-Block V8 American Muscle Car Museum Not Just For The Corvette Although the LT-1 in the ZR1 Corvette was the rarest engine application from Chevrolet, the LT-1 engine was used in other production vehicles, including:1970–1972 Chevrolet Camaro — LT-1 used in performance Camaros/Z/28s. This Camaro application was the most common with 8,733 models in 1970, 4,862 in 1971, and 2,575 in 1972. That makes it the most common application of the Chevy LT-1 engine.Yenko/COPO Novas and Yenko Deuce conversions — dealer/COPO conversions placed the LT-1 in Novas for limited runs. The Yenko COPO factory models totaled 50 cars while dealer LT-1 conversions totaled 125. Two models were sent to Canada, which made the official total 177. One of the rarest conversions created was the Chevrolet Camaro Hurst Sunrise model, which totaled three dealer-converted vehicles. C3 Chevrolet Corvette ZR1: What You Didn’t Know GM Authority A Special Purpose Package The ZR1 package (sometimes called the “Special Purpose” package) was intended for competition. Many comfort/convenience options were deleted to save weight; that’s part of why few were ordered. The ZR1 was not a separate model but a Regular Production Option (RPO) code that Chevrolet offered between 1970–1972. It was designed for racing-oriented buyers, stripping out creature comforts and adding performance parts. Heavy Performance Hardware Along with the LT1 engine, the ZR1 package included a M22 “Rock Crusher” 4-speed close-ratio manual transmission, heavy-duty brakes (power-assisted, dual-pin front calipers) and J56 brake package, a special suspension with stronger shocks and springs along with larger front and rear stabilizer bars, and an aluminum radiator, a metal fan shroud for improved cooling. ZR1 Shared “L88 Chassis Prep” Roots The ZR1 package carried over many of the heavy-duty components from the L88 high-performance/big-block Corvettes. While the engine was different, many elements of cooling, chassis, and brakes were similar. Fewer ZR1 Cars Than Engines Because the LT-1 was available in Camaros and Novas (via COPO/Yenko conversions) in larger numbers, you’ll find more LT-1 engines than ZR1 cars, but the ZR1 with the LT-1 engine is what’s rare. Other Rare Chevy Muscle Car/Engine Configurations Mecum Auctions 1967 L88 Corvette The 1967 L88 Corvette used a 427-big-block V8 engine, and only 20 cars were made that year with this engine. This engine was rated at 430 horsepower, but was another model listed to be much lower than the actual output. Many experts claim this Corvette produced about 560 horsepower at 64,00 rpm. This engine, mated to either a four-speed manual or three-speed automatic transmission, was capable of sending the car to 60 MPH in 4.2 seconds, which is extremely fast today. 1990-1995 C4 Corvette ZR1 LT5 Although 6,939 ZR1 Corvettes were built during the C4 generation, they are still one of the rarest Chevy engine configurations, especially considering that they were made for high-performance Corvettes. The LT5 engine was designed by Lotus and built by Mercury-Marine for the C4 Corvette. It was a 5.7-liter V8 that produced 405 horsepower and 385 lb-ft of torque. This was enough power for the car to reach 60 MPH in 4.9 seconds, complete a quarter mile in 13.4 seconds, and post a top speed of 179 MPH.Sources: GM Authority, Hot Rod Magazine, National Corvette Museum, Hemmings.
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