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While primarily intended for the
Chevrolet Vega, the H platform was not developed by the Chevrolet Division itself, but became the first vehicle architecture developed by a centralized GM design and engineering team. Replacing two subcompact cars separately in development by Chevrolet and Pontiac,
519:
For 1975, the introduction of the
Chevrolet Monza saw the introduction of V8 engines to H platform (not offered in the Vega and Astre). In 1975, the H-platform also adopted a Buick-designed 231 cubic-inch V6. For 1978, the 140 cubic-inch inline-4 was replaced by a Pontiac-designed 151 cubic-inch
496:
For 1975, the
Chevrolet Monza was introduced as a three-door hatchback, alongside the Buick Skyhawk, and Oldsmobile Starfire; a two-door notchback coupe was introduced during the model year. For 1976, the Pontiac Sunbird was introduced, sharing the body of the Monza notchback coupe; a Sunbird
455:
development of the H-body began in 1968. In slightly over two years, GM sought to develop its first subcompact with a sub-2000 pound curb weight, an all-aluminum engine, and priced at or less than the
Volkswagen Beetle; assembly of the vehicle was to be primarily automated.
489:
For 1971, the
Chevrolet Vega was introduced in four body styles, including a two-door sedan, a three-door hatchback and a three-door station wagon and panel delivery. For 1973, the front bumper was relocated forward; for 1974, both front bumpers were redesigned.
473:
The unibody H-platform is rear-wheel drive, using a 97-inch wheelbase. Scaling down the design of larger GM platforms, the H platform uses unequal-length A-arm front suspension; the rear suspension is a coil-spring solid rear axle.
527:
In addition to the
Cosworth Vega engine, the H platform served in the development of several advanced GM engine designs. In 1972, a prototype Vega powered by a 302 cubic-inch aluminum-block V8 (derived from
508:
The
Chevrolet Vega was introduced with a Chevrolet-designed 140 cubic-inch inline-4 engine; while using an aluminum engine block, the cylinder head was of cast-iron construction. The later
536:
was intended to be a key feature of the
Chevrolet Monza hatchback and its counterparts; following its 1974 cancellation, the GMRCA was replaced by 262 and 305 cubic-inch Chevrolet V8s.
493:
The
Pontiac Astre was introduced for 1973, styled with a different front grille from the Vega. Initially exclusive to Canada, Pontiac released the Astre in the United States for 1975.
885:
714:
500:
For 1978, the Vega and Astre were discontinued, with the station wagon body style rebadged as a Monza and
Sunbird wagon; the station wagon was dropped for 1980.
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439:
compacts to front-wheel drive, the H platform ended production for the 1980 model year. For 1982, the H-body vehicles were replaced by the front-wheel drive
533:
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From 1986 to 1999, the H platform designation was revived for front-wheel drive full-size sedans of the Buick, Oldsmobile, and Pontiac divisions.
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from the 1971 to 1980 model years. The first subcompact car design developed by GM, the rear-wheel drive H platform initially underpinned the
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used dual overhead camshafts, 4 valves per cylinder, and electronic fuel injection; in total, 5000 engines were assembled for 1975.
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personal luxury), GM moved to redesign the rest of its major model lines. Following the 1980 shift of the
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hatchback was introduced during 1976 (the Skyhawk and Starfire were only offered as hatchbacks).
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was fitted with a 122 cubic-inch all-aluminum inline-4. An advanced design for the time, the
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416:(later sold alongside it), the H-platform was sold nearly exclusively in North America.
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715:"Did the Chevrolet Vega develop out of stalled plans for a third-generation Corvair?"
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counterpart. For 1975, the H platform was expanded from entry-level vehicles to
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743:"Chevrolet Vega: A Terrible Car That Shouldn't Have Been Terrible"
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The fourth character in the Vehicle Identification Number
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807:Chevrolet Cosworth Vega press release-March 1975
819:The Standard Catalog of American Cars 1946–1975
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8:
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773:Huffman, John Pearley (October 19, 2010).
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798:Vega Shop Manual-Chevrolet Motor Division
543:
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412:In contrast to the globally-developed
296:350 cu in (5.7 L) OHV
291:305 cu in (5.0 L) OHV
286:262 cu in (4.3 L) OHV
281:231 cu in (3.8 L) OHV
276:196 cu in (3.2 L) OHV
7:
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859:H-body.se - Swedish H-Body registry
775:"The Car That Nearly Destroyed GM"
14:
268:151 cu in (2.5 L)
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467:H platform component arrangement
328:Turbo-Hydramatic 3 spd.automatic
713:Strohl, Daniel (May 26, 2021).
321:Torque-Drive clutchless manual
1:
520:inline-4 (later known as the
423:of its larger car lines (the
344:97.0 in (2,464 mm)
817:Gunnell, John, ed. (1987).
572:97.0 in (2464 mm)
324:Powerglide 2 spd. automatic
1472:
841:Hot Rod magazine-July 1972
481:for an H-body car is "H".
61:General Motors Corporation
23:
15:
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358:General Motors J platform
40:
1456:General Motors platforms
670:Chevrolet Cosworth Vega
510:Chevrolet Cosworth Vega
103:Sainte-Thérèse Assembly
821:. Kraus Publications.
470:
109:Ramos Arizpe, Coahuila
89:South Gate, California
30:Motor vehicle platform
466:
157:2-door fastback coupe
935:Delta (D2XX/PATAC K)
749:. September 18, 2020
514:Cosworth Vega engine
18:List of GM platforms
955:Epsilon (E2XX/P2XX)
695:Oldsmobile Starfire
647:Oldsmobile Starfire
403:Oldsmobile Starfire
375:automobile platform
365:The General Motors
204:Oldsmobile Starfire
93:South Gate Assembly
556:Previous platform
522:"Iron Duke" engine
504:Powertrain details
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84:Lordstown Assembly
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779:Popular Mechanics
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316:5-speed manual w/
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115:Body and chassis
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685:Pontiac Sunbird
680:Chevrolet Monza
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599:Chevrolet Monza
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459:Design overview
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407:Pontiac Sunbird
395:Chevrolet Monza
379:subcompact cars
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305:Transmission(s)
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194:Chevrolet Monza
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80:Lordstown, Ohio
78:United States:
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665:Chevrolet Vega
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568:Chevrolet Vega
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559:Next platform
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431:intermediate,
419:Following the
391:sport compacts
383:Chevrolet Vega
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314:4-speed manual
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184:Chevrolet Vega
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171:panel delivery
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99:Quebec, Canada
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24:Main article:
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916:In production
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637:GM J platform
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630:Buick Skyhawk
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620:GM J platform
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585:Pontiac Astre
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399:Buick Skyhawk
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393:, adding the
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387:Pontiac Astre
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189:Pontiac Astre
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145:Body style(s)
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26:GM H platform
22:
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794:
782:. Retrieved
778:
751:. Retrieved
746:
722:. Retrieved
718:
708:
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488:
476:
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453:
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370:
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56:Manufacturer
21:
1385:Trucks/SUVs
1288:Trucks/SUVs
979:Trucks/SUVs
485:Body design
450:Development
427:full-size,
67:Also called
1295:C/K Series
854:H-Body.Org
747:MotorTrend
701:References
553:Wheelbase
469:Vega Sedan
421:downsizing
414:T platform
367:H platform
349:Chronology
334:Dimensions
218:Powertrain
126:Subcompact
36:H-platform
16:See also:
898:platforms
643:1975–1980
626:1975–1980
609:1976–1980
595:1975–1980
581:1973–1977
564:1971–1977
354:Successor
340:Wheelbase
318:overdrive
256:2.0 Liter
244:2.3 Liter
230:2.3 Liter
224:Engine(s)
161:hatchback
151:notchback
138:FR layout
1450:Category
1415:Category
784:July 19,
753:July 19,
724:July 19,
719:Hemmings
659:See also
385:and its
377:used by
373:) is an
309:3-speed
254:122 CID
242:140 CID
228:140 CID
177:Vehicles
169:3- door
164:3- door
107:Mexico:
97:Canada:
75:Assembly
50:Overview
1425:Commons
1324:530/560
1308:345/745
1304:325/330
1197:Premium
1025:Retired
907:Marques
534:(GMRCA)
159:3-door
149:2-door
1362:Future
1346:Lambda
1111:GM4200
1106:GM2900
825:
550:Model
547:Years
540:Models
530:CERV I
441:J-body
437:X-body
433:E-body
429:A-body
425:B-body
405:, and
371:H-body
311:manual
133:Layout
70:H-body
1397:VSS-T
1392:VSS-S
1376:VSS-R
1351:Theta
1217:Sigma
1154:Kappa
965:Omega
960:Alpha
950:VSS-F
930:Gamma
479:(VIN)
166:wagon
154:coupe
121:Class
1435:List
1369:Cars
1340:K2XX
1279:Zeta
1212:SCCS
1058:BEV2
1032:Cars
1008:T1XX
1000:31XX
991:C1XX
940:BEV3
923:Cars
823:ISBN
786:2021
755:2021
726:2021
369:(or
259:DOHC
248:2bbl
246:OHC
236:1bbl
1336:900
1332:800
1328:600
1320:400
1316:360
1312:355
1300:GMT
1263:RWD
1259:FWD
1244:RWD
1240:FWD
1230:RWD
1226:FWD
1191:FWD
1187:RWD
1172:RWD
1168:FWD
1148:RWD
1144:FWD
1124:RWD
1120:FWD
1100:RWD
1096:FWD
1071:RWD
1067:FWD
1047:RWD
1043:FWD
1004:610
996:GMT
986:BT1
945:GEM
524:).
270:OHV
262:EFI
233:OHC
1452::
1338:,
1334:,
1330:,
1326:,
1322:,
1318:,
1314:,
1310:,
1306:,
1261:,
1242:,
1228:,
1189:,
1170:,
1146:,
1130:HQ
1122:,
1098:,
1069:,
1045:,
1006:,
1002:,
777:.
763:^
745:.
734:^
717:.
409:.
401:,
397:,
298:V8
293:V8
288:V8
283:V6
278:V6
273:I4
265:I4
251:I4
239:I4
1342:)
1302:(
1274:Z
1269:Y
1265:)
1257:(
1255:X
1250:W
1246:)
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