1971 Corvette Stingray guide: the low-lead year, the 425 hp LS6, the LT1, ZR1, ZR2 and what to pay

GM’s own words on the fuel fit in one line of its 1971 new-features sheet: “All engines operate on low lead fuel.” The Black Book goes further: GM told its divisions to bring octane needs down to 91 research for 1971, giving oil companies time to phase in the unleaded fuel catalytic converters would need four years later, and “with the exception of RPO LS6, 1971 engines were detuned variants of 1970 engines.” RPO is GM’s regular production option code.

Detuned meant compression. GM’s September 1970 engine data drops the base 350 and the LS5 454 from 10.25:1 to 8.5:1 and the LT1 from 11.00:1 to 9.00:1, against the 1970 figures. The same page, and GM’s January 1971 album, give both ratings for every engine: gross, the old yardstick, and SAE net, measured with the engine as installed. From 1972 GM published net only (the generations guide has the background), so the 1971 is the one year GM’s own paper reads on both scales.

Prices are from Chevrolet’s dealer price sheet; the Black Book rounds them to $483, $295 and $1,221. Counts are the Black Book’s, which leaves out the base engine: about 14,550 is 21,801 less the three options, with the ZR1s and ZR2s inside the LT1 and LS6 figures.

How much horsepower does a 1971 Corvette have? From 270 hp gross (210 net) to the LS6’s 425 hp gross (325 net). The 1970’s 350 hp L46 wasn’t offered, so a “1971 350/350” has been changed (CorvetteForum, 2011). In gross terms the LS5 lost least, 25 hp, and the LT1 most, 40.

Owners in a 2019 CorvetteForum thread blame the 1971’s “dog” reputation partly on net numbers. Net against net, GM rates the 1971 LT1 at 275 hp and the 1972’s at 255: the scale moved more than the engine did.

The LS6 is the 1971’s headline, and the Black Book explains why it exists: it “was designed to operate on low-lead fuel, but a comparable engine was not available in 1970, so it won the horsepower race for the two years.” It was a 454 with aluminum heads, 9.00:1 compression, mechanical lifters, a Holley four-barrel and transistor ignition. The Black Book counts 188 cars, and GM’s 2001 kit repeats that “only 188 Corvettes were sold” with it, the figure the 2001 Corvette guide gives when the LS6 code returned.

It cost $1,220.70 on GM’s sheet, and it came with rules. GM’s power-team chart pairs it with the close-ratio M21 four-speed, the heavy-duty close-ratio M22 ($100.35, “with 425-hp engine only”) or the Turbo Hydra-Matic automatic ($100.35), never with the standard wide-ratio box, and offers no air conditioning with it. An LS6 coupe came to $6,717 before anything else.

Car and Driver’s June 1971 test of an LS6 with the M22 and a 3.36 axle, as Corvette Action Center transcribes it, ran 0–60 mph in 5.3 s, the quarter mile in 13.80 s at 104.65 mph, and 152 mph flat out.

Owners say no LS6 Corvette was built before March 1971, and one 2017 CorvetteForum poster (opens in new tab) names serial 110931 as the earliest documented car, built in early March by the Black Book’s monthly table. An “LS6” whose serial says autumn 1970 needs a very good story.

Why does a GM page call it an LS7? A 1970 leftover. The dealer option page labels the 425 hp engine LS7, the name of the 460 hp 454 that, by the Black Book, never reached a retail buyer in 1970. The engine data page heads the LS6 column “460 HP” over a 425 rating, and the weights page calls the LT1 the 370 hp engine. Every price and production record says LS6 at 425 hp: there is no 1971 LS7.

The Chevelle’s 1971 LS6 shared the code but not the suffixes: CPP and CPR, against the Corvette’s CPW and CPX (CorvetteForum, 2011). A Chevelle LS6 in a Corvette is a swap, however good.

The LT1 was the high-revving 350: 9.00:1, mechanical lifters, a Holley four-barrel (3989021, OEM) and transistor ignition, rated 330 hp at 5,600 rpm. GM’s sheet sold it only with a four-speed, and its power-team chart lists no automatic and no air conditioning with it. (One January 1971 album page pairs it with the automatic, against every other GM page: a misprint.) Chevrolet built 1,949 at $483.45. It was the LT1’s last gross-rated year: for 1972 it made 255 hp net and could finally have air, on about 240 cars by the 1972 Black Book.

The ZR1 ($1,010, 8 cars) was the LT1 turned into a race package, by the Black Book’s option page: the M22 gearbox, heavy-duty power brakes, transistor ignition, a special aluminum radiator, special springs, shocks and stabilizer bars, and metal fan shrouds. It couldn’t have power windows, a rear defroster, air, power steering, deluxe wheel covers, the alarm or a radio. The Black Book says ZR1s have turned up with and without the rear bar.

The ZR2 ($1,747, 12 cars) was the same package around the LS6. The Black Book says the LS6 could have an automatic, “although not when combined with the ZR2 package.”

Neither package is on GM’s price sheet or option page in the kit; the Black Book, Corvette Action Center and Hagerty all put ZR1 and ZR2 production at 8 and 12. Sellers claim one ZR1 and two ZR2 convertibles among them; no GM record confirms it. classic.com’s February 2026 benchmarks were $542,800 for a 1971 ZR2 and $220,612 for a 1970–1971 ZR1.

The Black Book says the May 1969 labor dispute ran 1969 production long and cut 1970’s short, and that “Chevrolet then treated 1971 Corvette production as an extension of 1970.” Its table of the last serial built each month begins in August 1970, and then it skips a month:

The monthly counts are this site’s arithmetic. The table stops at June, leaving 1,115 serials (to 121801) without a month, so production ran to at least June 1971.

The Black Book doesn’t explain the gap. The United Auto Workers struck General Motors on September 15, 1970 and ratified a new contract on November 20, after 67 days (Wikipedia), and owners tie the empty October and thin November to that strike (CorvetteForum, 2012 and 2017). That link is the owners’ reading, and this site’s, not the Black Book’s.

Even so, 1971 beat 1970’s 17,316 by about 26 percent, and fell short of 1972’s 27,004 (see the production table in the C3 guide). Convertibles were about a third.

The Black Book calls the 1971 “one of the least-changed in appearance,” because the octane work “carried a higher priority than appearance changes.” GM’s features sheet lists what did change: ten colors, “7 new for ‘71” (six new names against the Black Book’s 1970 list), new interior colors, standard fuel evaporation control, a new emission control valve, and a “new low profile body resin process” for a smoother finish. That resin still matters to a body shop: Parts bulletin 74-9, in the section on Chevrolet’s 1971 paper, says why.

The parking lamp lenses are a soft clue. The Black Book says amber lenses mark a 1971 and very early cars had clear ones; GM’s own 1971 album still lists “white lenses over amber”, word for word the 1970 line. Lenses swap in minutes, so they date nothing.

The 1971 was the last Corvette with fiber-optic light monitors in the console; the Black Book thinks the savings paid for a standard alarm in 1972. The 1972 also put an engine letter in the VIN, dropped the LS6 and ZR2, and rated everything net. The 1973 traded the chrome front bumper for a body-color one.

Did the 1971 Corvette have side pipes? Not from the factory: the 1971 option list has no side exhaust, so side pipes on a 1971 were added later.

Gearboxes. A wide-ratio four-speed (2.52:1 first) was standard with the 270, 330 and 365 hp engines. The close-ratio M21 (2.20:1 first) cost nothing with the 330, 365 or 425 hp engines and went into 2,387 cars, the heavy-duty M22 into 130. The Turbo Hydra-Matic (M40) was free with the 270 hp engine and $100.35 with either 454, and 10,060 buyers took it, 46 percent.

Axles. Positraction was standard. GM’s chart gives the base car 3.36:1 with the four-speed and 3.08 with the automatic, the LT1 3.55 or 3.70, the LS6 3.36 manual or 3.08 automatic. Other ratios, 2.73 to 4.56, cost $12.65 (2,395 cars).

Price new. The Black Book prices the coupe at $5,496 and the convertible at $5,259, up $304 and $410 on 1970. GM’s undated dealer sheet in the kit prints $5,533 and $5,296, the same figures the Black Book gives for 1972; nothing found for this guide dates the sheet.

Options. The Black Book’s prices and counts (percentages are this site’s arithmetic):

GM’s chart allowed air only with the base 350 or the LS5, with the wide-ratio four-speed or the automatic.

1971 Corvette specs. A 98.0 in wheelbase, 182.5 in long, 69.0 in wide and 47.8 in high as a coupe, with curb weights of 3,292 lb (coupe) and 3,306 lb (convertible), from GM’s album.

Ten colors, two of them 1971 only

The Black Book counts every color (21,302 in all, 499 short of production, as it notes). The trim tag carries the three-digit code; GM’s album uses two digits.

Set against the Black Book’s 1970 and 1972 lists, Brands Hatch Green and Nevada Silver appear only for 1971, and Mulsanne and Bridgehampton Blue end with it. No black was offered, and a 1970 color such as Cortez Silver or Monza Red on a “1971” means the paint or the year is wrong. Soft tops came in black or white.

Inside, standard vinyl came in black (400), red (407), dark blue (412), saddle (417) or dark green (423); the Custom Interior’s leather in black (403) or saddle (420). The Black Book prints 402 for black leather; GM’s album says 403.

The VIN is on a plate on the left windshield pillar (GM’s serial page): 19437 for a coupe or 19467 for a convertible, 1 for 1971, S for St. Louis, and a serial from 100001 to 121801, one run for both bodies. The engine letter arrived for 1972, so a 1971 VIN can’t prove an LS6, LT1 or LS5; its serial only dates the car (see A strike in the serial numbers).

The engine pad is on the top front of the right-hand cylinder bank: a plant letter, the assembly month and day, and a suffix, as in GM’s example F1210CJL (F for Flint). Owners say it should also carry a VIN derivative, the serial in short (CorvetteForum, 2010). The Black Book’s suffixes and castings:

GM’s own serial page, which shows “only basic designations,” prints CGY for the LT1; the Black Book and owners read CGZ as the LT1 and CGY as the ZR1. The axle’s ratio code is on the bottom edge of the carrier flange: AW for 3.08, AX or LR for 3.36 (bulletin 71-T-10).

The paper decides it. The build sheet glued to the top of the fuel tank, the tank sticker, the Protect-O-Plate warranty plate, an order copy or a shipping report separates a real LS6 or LT1 from a good copy. A 425 decal and console plate cost a few dollars (CorvetteForum, 2022).

How owners tell a real LT1

Every LT1 part can be bought, owners in a 2010–2013 thread warn (opens in new tab), so look for all of these:

• A CGZ pad (CGY on a ZR1), dated to fit the car.
• A 6,500 rpm tachometer redline, a domed hood and a console plate reading 330 hp.
• The transistor ignition amplifier on the left front fender, or its holes.
• A Holley with a single fuel line, no return line and no coolant expansion tank.
• A four-speed and no air conditioning.

And a real LS6

• A CPW or CPX pad, aluminum heads (3946074) and a Holley 3986195 (manual) or 3986196 (automatic), OEM numbers per the Black Book.
• Transistor ignition, and a fuel return line, which the LT1 didn’t have (CorvetteForum, 2017).
• Pump-to-carburetor lines and a fuel block that one 2001 poster says were unique to the 1971 LS6.
• A serial of 110931 or higher (see The LS6), and the paper.

A case from 2026. In March, Bring a Trailer listed a Brands Hatch Green convertible as an LS6 M22. CorvetteForum members questioned (opens in new tab) its engine and transmission stamps and build date, and its serial falls in December 1970 by the Black Book’s table. BaT withdrew the listing on March 20 with the bid at $51,000, without a specific reason. The lesson is general: an LS6 is bought on its numbers and paper.

NHTSA (opens in new tab), the US road safety agency, holds no owner complaint and no GM recall for the 1971 Corvette (checked October 22, 2026). Its complaint file starts in September 1994, so that says nothing about these cars new, and the one recall listed covers aftermarket Cardone rear calipers made in 2002–2003 (campaign 03E032000). Chevrolet’s own dealer paper says more, as Corvette Action Center transcribes it (the originals weren’t seen for this guide):

1. The wrong axle (71-T-10). “A few 1971 Corvettes” got the wrong ratio “due to a computer programming malfunction,” the bulletin says (opens in new tab), 3.36:1 where 3.08 belonged and the reverse. An odd axle code on a 1971 may be a factory mix-up, not a swapped rear.
2. A battery-draining relay (71-T-44). On cars with air, alternator feedback could short the anti-diesel relay and hold the compressor clutch on after shutdown, flattening the battery. A relay with a suppression diode went into production the week of April 26, 1971.
3. Body repairs (Parts bulletin 74-9). Polyester repair kit 1051373 “will not adhere securely” to 1971 and later Corvettes built with low-profile sheet molding compound panels; use epoxy kit 1051906 (both OEM). Ask what a 1971’s fiberglass was repaired with.
4. 454 overheating with air (73-T-28). For heavy traffic in hot weather, Chevrolet released flex fan 6260480 (OEM) for any 1970–1973 Corvette with a 454 and air. In 1971 that means an LS5.
5. Transistor ignition moisture (68-T-8). Moisture is the usual cause of a failed pulse amplifier on 1965–1972 cars with transistor ignition, which includes every LT1 and LS6.

Frames, birdcages, calipers and vacuum headlights are in Known C3 problems in the C3 guide.

1. The birdcage and frame first, by the C3 checklist. A rotten birdcage (the steel cage inside the fiberglass) outweighs any engine code.
2. The VIN: 194371S (coupe) or 194671S (convertible), serial 100001 to 121801.
3. The paint code on the trim tag: one of the ten in the 1971 color table. Black, or any color not in that table, means a repaint.
4. The engine pad: a suffix from the table in Pad and paper, a date before the car’s build, and a VIN derivative.
5. The hood against the pad. The domed hood came with the 330, 365 and 425 hp engines; over a 270 hp pad (CJL, CGT or CJK) it was added.
6. Gearbox and air against the engine. An automatic behind an LT1, air in an LT1 or LS6, or a wide-ratio box behind an LS6 means something was changed.
7. A claimed LS6, LT1, ZR1 or ZR2: the checks in Pad and paper, then the build sheet, tank sticker or order copy. An LS6 without paper is priced as a big-block 1971.
8. The axle code on the carrier flange, read with 71-T-10 in mind.
9. Fiberglass repairs done with epoxy, not polyester, and an inspection on a lift by a shop that knows C3s.

What is a 1971 Corvette worth? From January 1 to October 21, 2026, 13 were listed on Bring a Trailer (opens in new tab) and nine sold, at a median of $35,750 and from $16,250 to $136,000, by this site’s count of sold prices without the buyer’s fee. By engine:

• LS6: $136,000 for a Classic White M22 coupe with a 4.11 axle, copies of its tank sticker and owner-club certificates, sold with no reserve in June.
• LS5: $55,000 for a four-speed convertible with a broken odometer, and $45,000 for a four-speed coupe with air and a rebuilt engine.
• LT1: $72,750 for a convertible with a 2007 NCRS Second Flight award and its judging sheets, and $35,027 for a coupe with a rebuilt engine and forged pistons.
• Base and unspecified 350s: four sales from $16,250 (a replacement truck engine) to $35,750 (an automatic convertible with air).

In 2025, 18 of 23 sold, at a median of $42,500: LT-1 four-speeds brought $43,000 to $57,750, 454s $26,000 to $71,000 plus a $9,355 project, and no LS6, ZR1 or ZR2 sold. Since the start of 2025, 27 sales give a median of $42,000. Samples this small are market color, not a valuation or a forecast.

Hagerty’s (opens in new tab) #3 (Good) value for a base 270 hp coupe was $24,500 (January 2026), up 7.9 percent, against $30,800 for a base 1970.

classic.com’s (opens in new tab) February 2026 benchmarks were $132,854 for the 1971 LS6, $542,800 for the ZR2, $220,612 for 1970–1971 ZR1s and $56,207 for 1970–1972 LT1s. Its LS6 page records a 2,588-mile LS6 M22 bid to $200,000 at Mecum’s Monterey sale in August 2025 and not sold; a bid isn’t a price.

Is a 1971 Corvette a good year, or the worst? Neither label fits. The C3 guide and the best Corvette years guide give worst to 1975, the slowest, and put 1968–1972 first for looks. The 1971 is a chrome-bumper car with less compression than a 1970, and the only year of the LS6 454 and of a ZR2 that reached buyers.

Buy an LS5 whose pad, hood and paperwork agree. The 1970 guide picks the L46, a 350 hp small-block that, unlike that year’s LT1, could have air conditioning, and names the LS5 for torque. The 1971 has no L46, and GM’s power-team chart allows air only with the base 350 or the LS5, so the LS5 is the strongest 1971 that can be ordered for comfort. It also lost the least of the carried-over engines, 25 hp gross, and still made 465 lb-ft, with a four-speed or the automatic. Chevrolet built 5,097, so there’s choice, and the two LS5s sold on Bring a Trailer in 2026 brought $45,000 and $55,000.

On a budget, a sound base car. About two in three 1971s left with the 270 hp 350, and Hagerty’s #3 value is $24,500, against $30,800 for a base 1970. Same chrome, same shape, and matching numbers mean least on it.

An LT1 only on its paper. The 2026 split says it all: $72,750 with judging sheets, $35,027 with a rebuilt engine.

The LS6 and ZR2 as collector’s cars, bought on documentation, never on a decal. Without paper, they’re big-block 1971s with a story.

Skip any 1971 with a rotten birdcage, or one whose engine claim and pad disagree. Find a sound LS5 and you have America’s sports car in its first low-lead year, with chrome at both ends and 454 cubic inches up front.