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See also: GM H platform (FWD)
The General Motors H platform or H-body is an automobile platform designation used for the 1971–1980 model year rear wheel drive line of subcompact cars. The fourth character in the Vehicle Identification Number for an H-body car is "H".
H-bodies were available as two-door notchback, hatchback, station wagon, and sedan delivery body-styles and have 4, 6, and 8-cylinder longitudinal GM engines, solid rear axle, and unibody construction. The platform was introduced with the 1971 Chevrolet Vega and was replaced by the GM J platform in 1981.
The Vega's engine is a 140 CID aluminum-block L4. 1972 GM prototype had an all-aluminum 302 small-block V8, but this was not approved. Chevrolet hand-built 5000 122 CID L4 Cosworth Twin-Cam engines for the 1975 Cosworth Twin-Cam Vega. Only 3508 1975-76 cars were built. The remaining engines were scrapped. The Chevrolet Monza was originally designed to use a Wankel engine but this project was cancelled.
The H platform designation was later used for unrelated front-wheel drive full-size cars in the 1980s.
| Years | Wheelbase | Model | Previous platform | Next platform |
|---|---|---|---|---|
| 1971–1977 | 97.0 in (2464 mm) | Chevrolet Vega | ||
| 1973–1977 | Pontiac Astre | |||
| 1975–1980 | Chevrolet Monza | GM J platform | ||
| 1976–1980 | Pontiac Sunbird | GM J platform | ||
| 1975–1980 | Buick Skyhawk | GM J platform | ||
| 1975–1980 | Oldsmobile Starfire | GM J platform |
See also
External links
- H-Body.Org
- H-Body FAQ
- Bob Gumm's V-8 Monza Site & Message Board
- The Chevrolet Monza and similar GM cars ( Buick Skyhawk, Oldsmobile Starfire, Pontiac Sunbird)
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