1970 Corvette Stingray guide: the short year, the 370 hp LT1, the 454 and what to pay

The 1969 ran long first: the Black Book’s monthly serials in GM’s 1969 kit run from September 1968 to December 1969. Its page in the 1971 kit blames the May 1969 dispute for shortening normal 1970 production “by over four months,” and says Chevrolet then treated the 1971 as an extension of the 1970. Its 1971 serials begin in August 1970.

Owners put the start in the first week of January 1970, one of them on January 5 (CorvetteForum, 2016 and 2020). From there, the Black Book page in the 1970 kit records the last serial built in each month, which dates any 1970:

The monthly counts are this site’s arithmetic. Nothing found for this guide explains April’s 337, the Black Book included.

So every 1970 Corvette is a car of January to July 1970: 17,316 of them, against 38,762 for the long 1969 and 21,801 for the 1971, the fewest of any C3 year (see the production table in the C3 guide).

Park a 1970 next to a 1969 and the differences are at the corners. Chevrolet’s dealer sheet of new Corvette features for 1970 lists:

• Flared wheel openings, front and rear. The Black Book says they were there to reduce the damage wheel-thrown debris did to 1968–1969 bodies.
• An egg-crate face: a precision-cast grille with larger parking lamps, and egg-crate fender louvers in place of the 1969’s four vertical slots.
• Rectangular exhaust outlets in the rear valance. The 1969’s side exhaust, RPO N14 (RPO is GM’s regular production option code), was gone, so side pipes on a 1970 were added later.
• New lamps front, side and rear. GM’s dealer album lists white lenses over amber parking lamps; amber lenses came with the 1971.
• High-backed seats with built-in head restraints, which the Black Book says gave more headroom.
• More in the base price: tinted glass, a four-speed manual and Positraction (Chevrolet’s limited-slip axle), where the 1969’s base car had a three-speed. The coupe rose from $4,781 to $5,192 and the convertible from $4,438 to $4,849.
• A high-domed hood with the 370, 390 and 460 hp engines, plus a side-terminal battery and quicker headlights.

Is a 1970 Corvette a Stingray? Yes. The one-word script arrived on the front fenders for 1969 (the generations guide has the history), and Chevrolet’s 1970 dealer album prints it above its drawings of the 1970 cars.

GM’s engine data and dealer price sheet give the gross ratings and prices, and the Black Book the counts. The small-blocks are 350s (4.00 x 3.48 in bore and stroke), the big-block a 454 (4.251 x 4.00 in).

No source found for this guide gives a base-engine count: 6,646 is the 17,316 total less the three optional engines, counting the 25 ZR1s among the 1,287 LT1s, as Corvette Action Center’s ZR1 page does. The LS5 ran hydraulic lifters, came with a heavy-duty battery and added 178 lb with the four-speed, 229 lb with the automatic (GM’s weights). The Black Book prices the LT1 at $447.60, GM’s sheet at $447.65.

Was there a 1970 LS6? No. The 425 hp LS6 454, with aluminum heads, arrived for 1971; the 1971 Black Book says no comparable engine was available in 1970.

The LT1: 370 hp for one year

The LT1 was the new one: a 350 with mechanical lifters, 11.0:1 compression, a Holley four-barrel and transistor ignition, peaking at 6,000 rpm. Chevrolet’s price sheet sold it only with a four-speed and said power steering was “not available” with it, and neither that sheet nor GM’s power-team chart offered it with air conditioning. For 1971 it fell to 330 hp gross, and for 1972 to 255 hp net, so the 370 hp LT1 is a 1970 engine only.

Its heads changed during the year: Chevrolet Service News for March 1970 announced a new LT1 and Z28 head with threaded rocker studs and guide plates in place of pressed-in studs (service studs 3973416 and guides 3973418, OEM).

The LS7: on GM’s paper, not in buyers’ cars

GM’s 1970 paper lists a fifth engine, the LS7: a 454 rated 460 hp at 5,600 rpm and 490 lb-ft at 3,600, with aluminum heads, mechanical lifters and 11.25:1 compression (11.0:1 on the features sheet). It’s on the dealer price sheet with no price printed, on the features sheet as the “top-output” option, in the power-team chart and on GM’s serial number page with engine codes of its own, CZL and CZN.

The Black Book page in the same kit closes the file. It calls the 460 hp package ZR2, notes it was also listed at 465 hp, and says it was “planned and advertised for 1970, but not delivered to retail customers.” A CorvetteForum member reading the 1970 assembly instruction manual in 2024 gives its cancellation date as May 6, 1970 (opens in new tab); that manual wasn’t seen for this guide. A 1970 offered as a factory LS7 car has the Black Book against it.

RPO ZR1 cost $968.95 and went on 25 cars, by the Black Book’s count: the LT1 plus the M22 heavy-duty close-ratio four-speed, heavy-duty power brakes, transistor ignition, a special aluminum radiator, and special springs, shocks and stabilizer bars. It couldn’t have power windows, a rear defroster, air conditioning, power steering, deluxe wheel covers, the alarm or a radio. The Black Book says ZR1s have turned up with and without the rear bar, and gives them metal fan shrouds, which some owners dispute (CorvetteForum, 2008).

The Black Book counts 25 M22s too, so every one went into a ZR1. GM’s price sheet listed the gearbox only “when 460-hp engine is ordered,” and that engine was never delivered to a retail customer.

What proves one. Paper. Every ZR1 part can be bolted onto an LT1 later, so a real one lives in its build sheet, order copy or tank sticker (the option list stuck to the fuel tank at the factory). As a former 1970 ZR1 owner put it in a 2008 thread (opens in new tab), “a genuine build sheet with the correct RPOs would be golden.” Both 1970 ZR1s sold on Bring a Trailer in 2025 were Corvette Bronze cars with paper: a coupe with its Corvette Order Copy, its Protect-O-Plate (the metal warranty plate) and a 1994 regional Top Flight award from the National Corvette Restorers Society (NCRS) brought $196,000, and a convertible with a partial tank sticker and NCRS and Bloomington Gold awards $245,000. classic.com’s February 2026 benchmark for 1970–1971 ZR1s was $220,612.

What is the holy grail of Corvettes? Among C3s, the C3 guide names the 1969 ZL1, an aluminum-block 427 of which two were built, with the L88 next. A 1970 has neither; its rarest package is the ZR1.

Gearboxes. A wide-ratio four-speed (2.52:1 first gear) was standard, the one Corvette Action Center lists as the M20. The close-ratio M21 (2.20:1 first) cost nothing extra and went into 4,383 cars, the heavy-duty M22 into 25, and the Turbo Hydra-Matic automatic (M40), free with the 300 and 390 hp engines, into 5,102. GM’s power-team chart lists no automatic for the L46 or the LT1, so a 1970 L46 or LT1 with an automatic has been changed.

Axles. Positraction was standard with every ratio from 2.73 to 4.56. GM’s chart gives each engine and gearbox its own standard ratio, from 3.08 to 3.70; another ratio cost $12.65 (2,862 cars).

1970 Corvette specs. A 98.0 in wheelbase, 182.5 in long, 69.0 in wide and 47.4 in high as a coupe (GM’s specification form), curb weights of 3,285 lb for the coupe and 3,299 lb for the convertible, and a 20-gallon tank, about 18 with California’s evaporative emissions controls.

Options. The ones that matter, with the Black Book’s prices and counts (GM’s price sheet matches every price it lists, and doesn’t list NA9):

Air conditioning came only with the wide-ratio four-speed or the automatic, never with the LT1, and GM’s own pages disagree on whether an automatic LS5 could have it.

Inside. Standard trim was vinyl in black, red, bright blue, brown, saddle or green, coded 400, 407, 411, 414, 418 and 422 on the trim tag. The Custom Interior ($158.00, 3,191 cars) brought leather seats in black (403) or saddle (424), cut-pile carpet and wood-grain accents on the doors and console. A light monitoring system, with its indicators in the console, was standard.

Colors and paint codes

GM’s February 1970 color table and its dealer catalog list ten exterior colors. The Black Book and Hagerty list eleven, adding Corvette Bronze (993). Factory Bronze cars exist, both 2025 Bring a Trailer ZR1s among them, but no source found for this guide says when Bronze joined the list. Black wasn’t offered: the 1969’s Tuxedo Black was dropped, and Hagerty says black didn’t return until 1977. Neither the Black Book nor Hagerty gives 1970 production by color. Soft tops came in black, white or sandalwood with any color, and the trim tag carries a three-digit paint code where GM’s data book uses two:

The VIN can’t name a 1970’s engine, and the stamps that do can be redone, so the numbers mostly date the car and its parts. A mismatch is where the questions start.

The VIN is on a plate on the left windshield pillar (GM’s identification page): 19437 for a coupe or 19467 for a convertible, 0 for 1970, S for St. Louis, then a serial from 400001 to 417316, one sequence for both bodies. The engine letter didn’t enter the VIN until 1972 (1972 kit), so a 1970’s VIN can’t prove an LT1, an L46 or an LS5.

The trim tag, on the driver’s side A-pillar by owners’ accounts, carries the trim and paint codes and the body build date: a month letter, A for January 1970 through G for July, and the day (CorvetteForum, 2006; Vette Registry). The month should fit the serial’s, from the monthly table in January to July: why the 1970 ran short.

The engine pad is on the top front of the right-hand cylinder bank: a plant letter, the month and day, and a suffix, as in GM’s example F1210CTL. Owners read V (Flint) or T (Tonawanda) on 1970 Corvette pads, which should also carry a VIN derivative, the car’s serial in short (CorvetteForum, 2006 and 2020). One member says most engines from the first two or three days of production carried the derivative low on the block by the oil filter instead, and that December 1969 engine dates suit very early cars (CorvetteForum, 2016). The Black Book’s suffixes, with its warning that some early 1970s carry 1969 codes:

The Black Book lists one block casting for every 1970 350, 3970010, and one for the 454, 3963512. A CE stamp on the pad marks a GM replacement block (CorvetteForum, 2023). GM puts the four-speed’s number on the top right of its case, the automatic’s nameplate on its right side and the axle number on the bottom of the axle tube, by the carrier.

What judges check. NCRS Flight judging scores a car against how it left the factory; a Top Flight award needs 94 percent of 4,500 points. Of the nine 1970s sold on Bring a Trailer in 2026, none was listed as keeping its original engine and three came with factory or judging paper.

How owners tell a real LT1

Badges, hoods and finned valve covers prove nothing. One 2017 CorvetteForum thread (opens in new tab) collects the usual checks, and four other threads from 2002 to 2023 agree on most. A good fake can pass any one, so look for all of them:

• A 6,500 rpm tachometer redline (owners put a base car’s near 5,500).
• The transistor ignition amplifier on the driver’s inner fender, or its three mounting holes.
• Air injection (A.I.R.) at the exhaust manifolds, or plugged holes where it was.
• A Holley with a single fuel line, no return line or tank nipple, and no radiator overflow tank.
• No air conditioning, no automatic and no factory power steering; one owner has never seen a genuine 1970 LT1 with factory power steering (CorvetteForum, 2008).
• Heavy-duty U-joint caps on the half shafts, and a console plate reading 370 hp.
• A CTK, CTR or CTU pad (CTV on a ZR1), dated to fit the car.

Only paper settles it: the build sheet or tank sticker (Corvette Action Center forum, 2002), or a Protect-O-Plate or dealer invoice.

Swapped hoods, engines and stamps

• Hoods. The domed hood came only with the 370, 390 and 460 hp engines, so one over a CTL or CTH pad needs explaining; owners have flagged LT1-style hoods on L46 cars for sale (CorvetteForum, 2021 and 2022).
• Engines. Real LT1s turn up with replacement engines. Owners in 2023 guessed $15,000–$20,000 for one without its original engine, or the “low 30’s” for a documented car with a replacement engine (CorvetteForum).
• Pads and parts. A Dutch buyer’s “L46” had A18 on its pad, which posters took for a rebuilder’s stamp (CorvetteForum, 2022), and an auctioneer’s “1970 LT1” had heads cast in August 1971 (CorvetteForum, 2023).

NHTSA (opens in new tab), the US road safety agency, holds no owner complaint and no GM recall for the 1970 Corvette (both checked October 18, 2026). Its complaint file starts in September 1994, so that silence says nothing about these cars new. The one recall listed against the year covers aftermarket Cardone rear calipers made in 2002–2003 (campaign 03E032000), and NHTSA’s bulletin files, from 1995 on, hold nothing for a 1970.

Chevrolet’s dealer paper, as transcribed by Corvette Action Center (the originals weren’t seen for this guide), says more:

1. Convertible top damage (70-T-46). On 1970s built before serial S400748, the folding top could rub against the top compartment lid’s pin support and be damaged; dealers ground 3/8 x 3/4 in off the support’s inboard edge. Coupes and convertibles share one serial run, so this covers the convertibles among the first 747 cars (opens in new tab). The transcription is dated October 27, 1970, after production ended.
2. Wipers that won’t park (70-T-59, 1968–1970). Heavy snow or ice could force the wiper motor’s drive shaft in and its retaining ring out of its groove; the 1971 shaft-and-ring unit, 4960192 (OEM), replaced 4911264.
3. Failed voltage regulators. A Chevrolet Engineering Center letter reports many failed integrated regulators in 1970 Delcotron alternators; one that overcharges the battery, after a full electrical check, gets regulator 1116387 (OEM).
4. 454 overheating with air conditioning (73-T-28). For heavy traffic in hot weather, Chevrolet released a flex fan for any 1970–1973 Corvette with the 454 and air, in place of the fan and fan clutch.
5. Transistor ignition moisture (68-T-8). Moisture is the commonest cause of a failed pulse amplifier, on every LT1 and on L46s and LS5s with transistor ignition; the fix is silicone grease in the connector.

1. The birdcage and frame first, by the C3 checklist. The birdcage is the steel cage around the cabin, inside the fiberglass, and a rotten one outweighs any engine code.
2. The VIN: 194370S (coupe) or 194670S (convertible), with a serial from 400001 to 417316.
3. The trim tag: a build month from A to G that fits the serial, and paint and trim codes from the 1970 lists. A black car has been repainted.
4. The engine pad: a V or T plant letter, a date before the car’s build (December 1969 is fine on an early car), a suffix that fits, and the VIN derivative. CE means a replacement block.
5. Hood and gearbox against the pad. A domed hood over a 300 or 350 hp pad, or an automatic behind an L46 or LT1, means something was changed.
6. An LT1 or ZR1: the checks in How owners tell a real LT1, then the paper. Without a build sheet, order copy or tank sticker, treat a claimed ZR1 as an LT1.
7. An early convertible, serial S400747 or lower: look where the folding top meets the lid pin support.
8. A 454 with air conditioning: watch the temperature gauge in traffic, and ask whether it has the flex fan.
9. Electrics: wipers that park, a charging voltage that isn’t too high, and the transistor ignition amplifier on cars that have one.
10. An inspection “stem to stern” by a shop that knows C3s, as owners told one first-time 1970 buyer (CorvetteForum, 2022).

How much is a 1970 Corvette worth? Between January 1 and October 18, 2026, 1970 Corvettes on Bring a Trailer (opens in new tab) brought a median $38,249 from nine sales, ranging from $14,750 to $102,000, by this site’s count of sold prices without the buyer’s fee. By engine:

• 454s: $60,000 (an LS5 four-speed convertible with a rebuilt engine and an NCRS shipping data report), $55,000 (a repainted four-speed coupe with aftermarket fuel injection), $38,249 (an LS5 coupe with a replacement automatic) and $14,750 (Baldwin-Motion tribute bodywork).
• L46: $45,500, a four-speed coupe with seven NCRS Top Flight awards from 2013 to 2017.
• LT1: $33,000, a four-speed coupe repainted in metalflake, with custom upholstery.
• Other 350s: $30,007 (a 7,000-mile automatic convertible with its window sticker) and $17,500 (a replacement engine).
• A restomod: $102,000, LS3 power on a tubular chassis.

In 2025, 17 of 23 listed sold, at a median of $39,500 and from $20,500 to $245,000. Besides the two ZR1s, LT1 coupes brought $75,500 (with window and tank stickers) and $70,500, an LS5 coupe owned for 54 years $65,500, L46 four-speed convertibles $39,000 to $56,000, and base or unspecified 350s $20,500 to $33,750. Samples this small are market color, not a valuation or a forecast.

Hagerty’s (opens in new tab) #3 (Good) value for a base 300 hp coupe was $30,800 (January 2026); its other grades and engines sit behind a login.

classic.com’s (opens in new tab) February 2026 benchmark for 1970–1972 LT1s was $56,207, with a record LT1 sale of $132,000 for a 1970 convertible in March 2025. The C3 guide’s Bring a Trailer median for 1968–1972 cars was $39,000 (45 sales, June 16 to September 26, 2026).

Why are 1970s Corvettes so cheap? The later ones are: the C3 guide’s mid-2026 medians were $11,550 for 1973–1977 cars and $17,625 for 1978–1982. A 1970 sits with the cars that aren’t cheap, with chrome at both ends, the high-compression engines and the smallest production of any C3.

The 1971 Black Book calls the 1971 one of the least-changed Corvettes in appearance. Underneath, by that page’s account, GM had told its divisions to bring octane needs down to 91 research for 1971, and every engine Chevrolet carried over came back detuned (1971 kit):

• The base 350 fell to 270 hp gross, the LT1 to 330 (1,949 built) and the LS5 to 365 (5,097).
• The LS6 454 arrived at 425 hp, with aluminum heads, in 188 cars.
• The ZR1 went on 8 cars, and a ZR2 with the LS6 on 12.
• Amber parking lamp lenses, after clear ones on very early cars, were an outside clue to a 1971.
• It was the last year of the fiber-optic light monitors in the console.
• Chevrolet built 21,801.

Lenses get swapped, so they date nothing on their own. Against a 1971, the 1970 has the stronger LT1 and LS5; the 1971 has the LS6.

Buy an L46 whose pad, trim tag and paperwork agree. It has the LT1’s 11.0:1 compression, rated 350 hp, and unlike the LT1 it could have power steering and, with the wide-ratio box, air conditioning, so a good one can be driven, not just judged. Chevrolet built 4,910, plenty to shop among, and L46s sold on Bring a Trailer for $39,000 to $56,000 in 2025 and $45,500 in 2026.

For torque, an LS5: 500 lb-ft, with an automatic if you want one. The two highest LS5 sales of 2025–2026 were $65,500 and $60,000.

On a budget, a solid 300 hp car, with the same body and chrome. Hagerty’s #3 value is $30,800, and 2025’s base and unspecified 350s sold for $20,500 to $33,750.

An LT1 only with paper, and a ZR1 as a collector’s car. The 2025 LT1 with its window and tank stickers brought $75,500; the repainted 2026 one, $33,000.

Skip any 1970 with a rotten birdcage, or whose engine story doesn’t match its pad. Which Corvette from the 1970s is the best? The best Corvette years guide and the C3 guide both pick 1968–1972 for looks, and the C3 guide cites one 1970 owner who prizes his as the last high-compression year.

Chevrolet had seven months to build 17,316 of them. Find one with a sound cage and numbers that agree, lift out the roof panels and let an L46 run to its 5,600 rpm peak: America’s sports car in its last year before the octane cut.