C1 - 1953-1962
C2 - 1963-1967
C3 - 1968-19821970 Corvette
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The 1970 model year saw several small styling changes. The front and rear wheel openings were slightly flared in the rear to reduce stone chipping and the four side fender gills were replace with egg-crate vents. The 427-cid engine was replaced with the new 454-cid engine but with reduced horsepower available. A new small block 350-cid engine was introduced with the RPO L71 and was rated at 370hp. The RPO ZR1 option included the L71 engine, M22 Muncie H.D. 4-speed transmission, H.D. power brakes, transistor ignition, special suspension, and an aluminum radiator with fan shroud. The labor dispute in May of 1969 that caused the 1969 model year to be extended naturally cut into the 1970 production number and only 17,316 1970 Corvettes were built as a result.
The ZR2 package like the ZR1, but with a 460hp (also listed as 465hp), 454-cid engine was planned and advertised for 1970, but not delivered to retail customers. Previously optional tinted glass, Positraction axle, and 4-speed wide ratio manual transmission were included in the 1970 base price.
All engine suffix codes now sported a 3-letter suffix. It's interesting to note the RPO LS6 engine being rated at 460-hp in the AMA specifications never saw production in the 1970 model year Corvette leaving the LS6 engine only available in the Chevelle with a horsepower rating of 450. All 454 engines have orange painted rocker arm covers.
1970 total Corvettes built - 17,316
1970 Coupes - 10,668
1970 Convertibles - 6,648
| Serial Numbers | |
| Corvette | 194x70S400001-194x70S417316 |
| Coupe is body style 37 and convertible is body style 67 | |
Engine Identification
| Position | Character(s) | Description |
| 1 | V or T | Flint, MI. or Tonawanda, N.Y. engine assembly plant |
| 2 to 5 | 1025 | Engine assembly date (month/day) |
| 6 and 7 | Code | CTH - 350-cid 350-hp, manual transmission CTJ - 350-cid 350-hp, manual transmission, A.C. CTK - 350-cid 350-hp, manual transmission, T.I. CTN - 350-cid 350-hp, manual transmission CTO - 350-cid 350-hp, manual transmission, A.C. CTP - 350-cid 350-hp, manual transmission, T.I. CTQ - 350-cid 350-hp, manual transmission, A.C., T.I. CGW - 454-cid 390-hp, automatic transmission CRJ - 454-cid 390-hp, automatic transmission, T.I. CRI - 454-cid 390-hp, manual transmission, T.I. CZU - 454-cid 390-hp, manual transmission |
| A.C. | Air Conditioning | |
| A.I.R. | Air Injection Reactor - All | |
| T.I. | Transistor Ignition | |
| Several engine suffix codes changed during the
model year. All engines were equipped with a single 4-bbl carburetor. Data are from GM's own "Information Kit" and some engines may or may not have made production. |
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Engine Specifications - 350 engines
| Item | Base RPO L75 | RPO L46 | RPO LT1 |
| Displacement | 350 cid | 350 cid | 350 cid |
| Bore & Stroke | 4.00" x 3.48" | 4.00" x 3.48" | 4.00" x 3.48" |
| Compression Ratio | 10.25:1 | 11.0:1 | 11.0:1 |
| Advertised Horsepower | 300 hp @ 4800 rpm | 350 hp @ 5600 rpm | 370 hp @ 6000 |
| Torque | 380 lb-ft @ 3200 rpm | 380 lb-ft @ 3600 rpm | 380 Lb-ft @ 4000 |
| Valve lifter type | Hydraulic | Hydraulic | Hydraulic |
| Fuel system | Rochester 4-bbl 7040503 - Manual 7040502 - Automatic |
Rochester 4-bbl 7040507 - Manual |
Holley 4-bbl 3972121 - Manual or 3972123 AMA Specifications show both. |
Engine Specifications - 454 engine
| Item | RPO LS5 |
| Displacement | 454 cid |
| Bore & Stroke | 4.251" x 4.00" |
| Compression Ratio | 10.25:1 |
| Advertised Horsepower | 390 @ 4800 |
| Torque | 500 @ 3400 |
| Valve lifter type | Hydraulic |
| Fuel System | Rochester 4-bbl 7040205 - Manual 7040204 - Automatic |
Regular Production Options
| RPO | Description | Cost | Units | % (1) |
| 19437 | Coupe | $5,192.00 | 10,668 | 61.6 |
| 19467 | Convertible | $4,849.00 | 6,648 | 38.4 |
| 424 | Leather seats | $158.00 | 3,191 | 18.4 |
| A31 | Power windows | $63.20 | 4,813 | 27.8 |
| A85 | Custom shoulder belts (standard with the coupe) | $42.15 | 475 | 7.15 |
| C07 | Auxiliary hardtop (convertible only) | $273.85 | 2,556 | 38.6 |
| C08 | Soft trim roof cover for auxiliary hardtop | $63.20 | 832 | 32.6 |
| C50 | Rear window defroster | $36.90 | 1,281 | 7.4 |
| C60 | Air conditioning | $447.50 | 1,287 | 38.5 |
| G81 | Optional rear axle | $12.65 | 2,862 | 16.5 |
| J50 | Power brakes | $47.40 | 8,984 | 51.9 |
| L46 | 350-cid, 350-hp | $158.00 | 4,910 | 28.4 |
| LS5 | 454-cid, 390-hp | $289.65 | 4,473 | 25.8 |
| LT1 | 350-cid, 370-hp | $447.60 | 1,287 | 7.4 |
| M20 | Wide ratio 4-speed transmission | Base trans | 7,806 | 45.07 |
| M21 | Close ratio 4-speed transmission | $0.00 | 4,383 | 25.3 |
| M22 | Heavy duty close ratio 4-speed transmission | $95.00 | 25 | 0.14 |
| M40 | Turbo Hydra-Matic 3-speed automatic transmission | $0.00 | 5,102 | 29.5 |
| NA9 | California emissions | $36.90 | 1,758 | 10.2 |
| N37 | Tilt-telescopic steering column | $84.30 | 5,803 | 33.5 |
| N40 | Power steering | $105.35 | 11,907 | 68.8 |
| P02 | Wheel covers | $57.95 | 3,467 | 20.0 |
| PT7 | F70 x 15 white stripe tires | $31.30 | 6,589 | 38.1 |
| PU9 | F70 x 15 white letter tires | $33.15 | 7,985 | 46.1 |
| T60 | Heavy duty battery (standard with LS5 engine) | $15.80 | 165 | 1.0 |
| UA6 | Alarm system | $31.60 | 6,727 | 38.8 |
| U69 | AM/FM radio | $172.75 | 14.579 | 84.2 |
| U79 | AM/FM stereo radio | $278.10 | 2,462 | 14.2 |
| LT1 | Special purpose engine package | $968.95 | 25 | 0.1 |
| (1) Percentages are calculated on
the number of options sold vs. the number possible. For example,
C08 was only available on the Auxiliary Hardtop so the 32.6%
reflects the number of Auxiliary Hardtops ordered with the C08
option. >> RPO C08 was only available in black. >> Convertible folding tops were black (standard), white and sandalwood being optional. >> Black was not a standard color choice for 1970 although it could be special ordered via the Fleet & Special Order (F&SO) process. |
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1970 Exterior/Interior Colors
| Paint Code | Color | Interior Color Choices * |
| 972 | Classic White | Black - Saddle - Red - Bright Blue - Green-Brown |
| 974 | Monza Red | Black - Saddle - Red - Brown |
| 975 | Marlboro Maroon | Black - Saddle - Brown |
| 976 | Mulsanne Blue | Black - Bright Blue |
| 979 | Bridgehampton Blue | Black - Bright Blue |
| 982 | Donnybrooke Green | Black - Saddle - Green - Brown |
| 984 | Daytona Yellow | Black - Green |
| 986 | Cortez Silver | Black - Saddle - Red - Bright Blue - Green - Brown |
| 991 | Ontario Orange | Black |
| 992 | Laguna Gray | Black - Saddle - Red - Bright Blue - Green - Brown |
| 993 | Bronze |
Saddle Not listed in GM documentation I have but shown on PPG charts |
Interior Trim Codes
| RPO | Color/Material |
| 400 | Black vinyl |
| 403 | Black leather * |
| 407 | Red |
| 411 | Bright Blue |
| 414 | Brown |
| 418 | Saddle |
| 422 | Green |
| 424 | Saddle leather * |
* Deluxe interior in black or saddle offered in leather and included special cut pile carpeting on floor and lower door side walls, wood grain insert on console and wood grand insert with bright die cast molding on door side wall.
1970 OEM Supplier Paint Colors
| Color | Valspar Code | PPG Code | DuPont Code | RM Code | SW Code | WA Code |
| Classic White | W041 | 8631 | 5040 | 1802 | 2517 | 3465 |
| Marlboro Maroon Metallic | R2078 | 2262 | 5131 | 2280M | 3069 | 4195 |
| Mulsanne Blue Metallic | L913 | 2213 | 5190 | 2262 | n/a | 4069 |
| Bridgehampton Blue Metallic | L1945 | 2199 | 5132 | 2263 | n/a | 4002 |
| Daytona Yellow | Y476 | 2094 | 5023 | 2119 | n/a | 3893 |
| Monza Red | R502 | 2089 | 5027 | 2021R | n/a | 3894 |
| Cortez Silver Metallic | S010 | 2059 | 5032 | 2108 | n/a | 3927 |
| Donnybrook Green Metallic | G1707 | 2200 | 5133 | 2267D | n/a | 4003 |
| Laguna Gray Metallic | B753 | 2198 | 5134 | 2258 | n/a | 4005 |
| Corvette Bronze Metallic | B1567 | 2264 | 5128 | 2376 | n/a | n/a |
When no radio was ordered, the blank space was filled by a radio hole cover.
GM Heritage PDF file of specifications/options/etc.
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