1970 Pontiac Grand Prix Facts, Figures, and Specifications
Five Fast Facts You May Not Know
1970 Pontiac Grand Prix
1. 455 CID 370 HP Replaces the 428
2. Leather Interior Continues
3. Two New Optional Steering Wheels
4. "SJ" Now Means 455 CID 370 HP V-8
5. Sports Seats Standard In SJ Option
1970 Pontiac Grand Prix –
Moving More Toward Luxury
For as much as Pontiac stressed performance in the 1969 Grand Prix, they began to walk it back in brochures and advertising in 1970. While still offering a 4-speed transmission and the new 455 CID V-8 with the camshaft from the 428 CID H.O. engine, they dropped the standard 455 CID 360 HP V-8 found in other Full Size Pontiacs. The option list shrank – and so did sales – down 40%.
1970 Pontiac Grand Prix Resources
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1970 Pontiac Grand Prix Facts – Body Paint Color Codes
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1970 Pontiac Grand Prix
| 10 Polar White | |
| 14 Palladium Silver | |
| 19 Starlight Black | |
| 25 Bermuda Blue | |
| 26 Lucerne Blue | |
| 28 Atoll Blue | |
| 34 Mint Turquoise | |
| 43 Keylime Green | |
| 45 Palisade Green | |
| 47 Verdoro Green | |
| 48 Pepper Green | |
| 50 Sierra Yellow | |
| 51 Goldenrod Yellow | |
| 53 Coronado Gold | |
| 55 Baja Gold | |
| 58 Granada Gold | |
| 63 Palomino Copper | |
| 65 Carousel Red | |
| 67 Castilian Bronze | |
| 75 Cardinal Red | |
| 78 Burgundy | |
| 60,06 Orbit Orange |
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1970 Pontiac Grand Prix Facts and Specifications
General Year Information – 1970 Pontiac Grand Prix
For 1970. vertical grille inserts replaced the horizontal bars of the 1969, the “Grand Prix” nameplates were moved from the lower cowls to the rear C-pillars and the vertical chromed louvers from the C-pillars down to the lower cowls. The optional 428 CID V-8 that had been rated at 370 and 390 HP was replaced by a new 370 HP 455 CID unit with 500 ft. lbs. of torque versus 472 for the 428. The base 350 hp 400 CID engine was still standard, and the low-compression 400 CID V-8 was available – with a two-barrel carburetor. While the 3-speed manual was considered standard, the T-400 automatic transmission was a no cost option.
Interior trim also received minor revisions, and surprisingly a bench seat with center armrest returned as a no-cost option that could replace the standard Strato bucket seats and console. Bench seat-equipped cars included a steering column-mounted shifter with with either the 3-speed manual or automatic transmission – and requiring a dashboard-mounted glove box! Power front disc brakes became standard equipment this year. Sales dropped 40%, with a total of 65,750 delivered.
1970 Pontiac Grand Prix Factoids
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The 428 CID V-8 disappeared from the entire Pontiac line, replaced by the 455. Unlike the previous year, the base 455 of 360 HP was not available in the Grand Prix, with only the equivalent of the former H.O. offered, using the HO camshaft/carburetor, but rated at 370 HP.
Disc Brakes, an option in 1969, were now standard. The increased stopping power added more high speed cornering capability as well as added safety.
1970 Pontiac Grand Prix Facts – Models Offered
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Series 276 – A minimum of styling changes, such as tail/amp revisions and recessed door handles, appeared on 1970 Grand Prix models. “Grand Prix”script replaced chrome slash moldings on the rear roof pillar. Standard equipment included dual exhaust. Interiors retained front Strato-Bucket seats, integral console with floor shift, carpeted lower door panels and trim panels, chrome body decor molding and special upholstery trims. The 4-speed manual transmission was available across the model line. In a surprising twist, a bench seat was an option. moving the shifter to the steering column and deleting the 4-speed as a choice.
The “SJ” option – See tab.
SJ Option – While not considered a separate model, the “SJ” option was available again at $223-244 extra. There was enough significance in the add-ins the option delivered to consider it separately. Against the standard Grand Prix was included ‘SJ’ badges, lamp group, larger tires, and the 455 cubic inch V-8. The 4-speed manual transmission was available across the model line.
1970 Pontiac Grand Prix Facts – Hurst SSJ
NOTE – While not a part of Pontiac factory production, the SSJ is notable for Hurst’s attempt to personalize the then popular Grand Prix. The Grand Prix SSJ was produced by Hurst Performance Research Corporation, a subsidiary of Hurst Performance, Inc. To order a SSJ, one would first order either a Model J or SSJ Grand Prix from a Pontiac dealer, specifying Cameo White or Starlight Black as the exterior color. Then one had to complete a Hurst order form to specify the SSJ conversion. The completed Grand Prix would then be shipped to Hurst for the SSJ conversion before being sent back to the selling dealer for delivery.
The ’70 SSJ Package
The base SSJ package added an additional $1,147.25 of a ’70 Grand Prix. It included Fire Frost Gold body accents and Rally wheels, an electric sunroof, a body-colored padded vinyl half-top, and specific SSJ identification. The package was available on both the Grand Prix J and the SJ, but vinyl accent stripes or a Cordova top could not be ordered. Virtually any other regular-production options were available at extra cost, but Rally wheels were required.
Exterior colors were Polar White or Starlight Black. Interior colors were limited to black, brown, gold, saddle, or sandalwood-ultimately depending upon seating type and surface. Factory completed Grand Prix models were then shipped to Hurst, where they received the SSJ conversion – then shipped to the selling dealer for delivery.
The Brochure may be found HERE.
1970 Pontiac Grand Prix Facts – Engines
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- 265 HP 400 CID V-8 AMT
- 350 HP 400 CID V-8 AMT
- 350 HP 400 CID V-8 SMT
- 370 HP 455 CID V-8 AMT
- 370 HP 455 CID V-8 SMT
400 CID 2-Barrel Economy V-8 – Automatic Transmission Only. Overhead valves. Cast iron block. Five main bearings.
Displacement: 400 CID.
Bore and stroke: 4.120″ x 3.750″.
Compression ratio: 8.6:1.
Horsepower: 265 @ 4600.
Torque: 397 @ 2400 RPM.
Valve Lifters: Hydraulic.
Camshaft timing: Intake 269°, Exhaust 277°, Overlap 47°, Lift (intake) 0.376″, (exhaust) 0.412″.
Carburetor: Rochester 2GC two-barrel Model 7040060.
400 CID 4-Barrel V-8 – Automatic Transmission Only. Overhead valves. Cast iron block. Five main bearings.
Displacement: 400 CID.
Bore and stroke: 4.120″ x 3.750″.
Compression ratio: 10.25:1.
Horsepower: 350 @ 5000.
Torque: 445 @ 3000 RPM.
Valve lifters: Hydraulic.
Camshaft duration: Intake 273°, Exhaust 282°, Overlap 55°, Lift: Intake 0.410″, Exhaust 0.4014″.
Carburetor: Rochester 4-barrel Model 7040264.
400 CID 4-Barrel V-8 – Manual Transmission Only. Overhead valves. Cast iron block. Five main bearings.
Displacement: 400 CID.
Bore and stroke: 4.120″ x 3.750″.
Compression ratio: 10.25:1.
Horsepower: 350 @ 5000.
Torque: 445 @ 3000 RPM.
Valve lifters: Hydraulic.
Camshaft duration: Intake 273°, Exhaust 289°, Overlap 54°, Lift: Intake 0.410″, Exhaust 0.413″.
Carburetor: Rochester 4-barrel Model 7040263.
455 CID 4-Barrel Option SJ V-8 455 V-8 – Automatic Transmission: Overhead valves. Cast iron block. Five main bearings.
Displacement: 455 CID.
Bore and stroke: 4.1251″ x 4.210″.
Compression ratio: 10.25:1.
Horsepower: 370 @ 4600 RPM.
Torque: 500 @ 3100 RPM.
Valve lifters: Hydraulic.
Camshaft duration: Intake 273°, Exhaust 282°, Overlap 55°, Lift: Intake 0.410″ Exhaust 0.414″.
Carburetor: 4-barrel Rochester 7040268.
455 CID 4-Barrel Option SJ V-8 455 V-8 – Manual Transmission Only. Overhead valves. Cast iron block. Five main bearings.
Displacement: 455 CID.
Bore and stroke: 4.1251″ x 4.210″.
Compression ratio: 10.25:1.
Horsepower: 370 @ 4600 RPM.
Torque: 500 @ 3100 RPM.
Valve lifters: Hydraulic.
Camshaft duration: Intake 288°, Exhaust 302°, Overlap 63°, Lift: Intake 0.414″ Exhaust 0.413″.
Carburetor: 4-barrel Rochester 7040267.
1970 Pontiac Grand Prix Facts – Chassis Features
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- Wheelbase: 118 inches.
- Overall length: 210.2 inches.
- Overall width: 75.7 inches.
- Overall height: 52.0 inches.
- Front track: 62.0 inches
- Rear track: 60.0 inches;
- Standard tires: G78 x 14.
- Optional tires: G70 x 14.
1970 Pontiac Grand Prix Facts – Powertrains
- Three Speed Manual Transmission Ratios
- All: 1st – 2.42:1, 2nd – 1.61:1, 3rd – 1:1, Reverse – 2.33:1. Synchromesh all forward gears.
- All: 1st – 2.42:1, 2nd – 1.61:1, 3rd – 1:1, Reverse – 2.33:1. Synchromesh all forward gears.
- Four Speed Manual Transmission Ratios
- Standard: 1st – 2.52:1, 2nd – 1.88:1, 3rd – 1.46:1, 4th 1:1, Reverse – 2.59:1.
- Special Order: 1st – 2.20:1, 2nd – 1.64:1, 3rd – 1.28:1, 4th 1:1, Reverse – 2.27:1.
- Automatic Transmission Ratios
- T-400 Hydra-Matic: 1st – 2.48:1, 2nd – 1.48:1, 3rd – 1:1, Reverse – 2.08:1.
- Rear Gear Standard Ratios
- 400 CID Economy Engine – AMT: 2.78:1; Optional 3.23:1.
- 400 CID 350 HP Engine – AMT: 3.23:1; Optional 2.93:1; 3.55:1.
- 400 CID 350 HP Engine – 3-Speed SMT 3.23:1.
- 400 CID 350 HP Engine – 4-Speed SMT 3.55:1.
- 455 CID 370 HP Engine – AMT 3.07:1; Optional 3.31:1.
- 455 CID 370 HP Engine – 3-Speed SMT 3.31:1.
- 455 CID 370 HP Engine – 4-Speed SMT 3.55:1.
1970 Pontiac Grand Prix Facts – Powertrain Options
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- Three-speed manual transmission was standard on all models except Economy Engine – automatic transmission mandatory.
- Three-speed Hydra-Matic transmission was optional at no cost.
- Four-speed manual transmission with floor shift was optional.
- The 400 CID 265 HP economy version of the 400 cubic inch V-8 was a no cost option.
- The 400 CID 350 HP V-8 was standard.
- The 455 CID 370 HP V-8 was part of the “SJ” option.
1970 Pontiac Grand Prix Facts – Significant Options
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- 3-speed manual transmission standard.
- 4-speed manual transmission ($226).
- Air-conditioner ($422).
- Automatic level control ($79).
- Capacitor ignition ($104-115).
- Cordova top ($105).
- Cornering lamps ($34).
- Cruise control ($63).
- Door edge guards ($6).
- Electric clock ($16).
- Front disc brakes standard.
- Hood mounted tachometer ($63).
- Leather Trim Group ($199).
- Mirror, rear view glare proof tilt ($4).
- Mirror, remote control outside rear view ($12).
- Power brakes ($42).
- Power bucket seat, left-hand ($69).
- Power steering ($105).
- Power windows ($104).
- Radio, AM/FM Stereo ($239).
- Radio, push button AM ($89).
Radio, push button, AM/FM ($151). - Rally gauge cluster with tachometer ($84).
- Rally II wheels ($63).
- Rear window defogger ($41).
- Remote control deck lid release ($14).
- Ride & Handling package ($9).
- Safeguard speedometer ($16).
- Tinted glass ($43).
- Tinted windshield ($29).
- Turbo-400 Hydramatic ($226).
- Under hood utility lamp ($7).
- Visor vanity mirror ($4).
1970 Pontiac Grand Prix Downloads and Images
1970 Pontiac Grand Prix Facts – Related Document Downloads
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1970 Pontiac Full Size Car Deluxe Brochure
1970 Pontiac Full Size Car Regular Brochure
1970 Pontiac Performance Brochure
1970 Pontiac Grand Prix Brochure
1970 Pontiac Grand Prix Print Ads
1970 Pontiac Grand Prix AMA Specifications Sheets
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1970 Pontiac Grand Prix Facts – Related Images
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1970 Pontiac Grand Prix Side View
The 1970 Pontiac Grand Prix received a minimum of styling changes – recessed door handles and “Grand Prix” replaced chrome slash moldings on the rear roof pillar. “SJ” designation moved to the lower front fenders and faux “vents” behind the front wheel opening. 65,750 were produced.
1970 Pontiac Grand Prix Rear View
At the rear of the 1970 Pontiac Grand Prix, little was changed, with “SJ” logos appearing on the right rear of the trunk lid when so optioned.
1970 Pontiac Grand Prix Grille and Logo
The Grille on the 1970 Pontiac Grand Prix now had vertical ribs rather than horizontal, but was otherwise unchanged. The “SJ” model received that logo ahead of the front wheel opening.
