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Event: G.I. Joe's Grand Prix PortlandDate: 31.7.1983
Track: Portland International Raceway (United States), 3.082 kmsOrganiser: unknown

Portland 3 Hours
Weather:unknown
Start time:14:00
Grid:unknown
Distance:3 hours
Attendance:unknown
Entered:44
Practiced:unknown
Started:38
Finished:21
Classes:Start
IMSA GTP11
IMSA GTO13
IMSA GTU14
Photo GalleryEntered CarsTechnical DataAppearanceRace ResultsGrid
Pre-race sessions:
2 non-qualifying practice sessions held for a total of 290 minutes on 29/7
2 qualifying sessions held for a total of 290 minutes on 30/7
60 minute pre-race warm-up held
Winners:
Overall:14March 83G PorscheAl Holbert
IMSA GTO:83Datsun 280ZX TurboDevendorf / Adamowicz
IMSA GTU:38Mazda RX-7Mandeville / Johnson
Fastest Laps:
Overall:44Jaguar XJR-5Bob Tullius (USA)1:05.8400168.5112 km/hlap 9
IMSA GTO:83Datsun 280ZX TurboDon Devendorf (USA)1:11.0300156.1997 km/hlap 6
IMSA GTU:79Porsche 924 Carrera GTRBob Bergstrom (USA)1:13.7800150.3771 km/hlap 29
Pole Positions:
Overall:44Jaguar XJR-5Bob Tullius (USA)1:04.5540171.8683 km/h
IMSA GTO:83Datsun 280ZX TurboDon Devendorf (USA)1:09.2950160.1104 km/h
IMSA GTU:79Porsche 924 Carrera GTRBob Bergstrom (USA)1:13.0500151.8802 km/h
Notes of interest:
Top makes by numbers:Porsche (11), Datsun (5), Mazda (5), Lola (4), March (3), BMW (3), Chevrolet (3)
Top engines by numbers:Porsche (13), Chevrolet (9), Datsun (5), Mazda (5), BMW (3)
Top car types by numbers:Datsun 280ZX (5), Porsche 911 Carrera (5), Lola T600 (4), Mazda RX-7 (4)
Driver nationalities:USA (56), CDN (2)
Team nationalities:USA (31)
Most used colours:white (48%), red (18%), yellow (14%), blue (6%), purple (4%)
Engine positions:front-engined (42%), mid-engined (34%), rear-engined (24%)
Oldest known drivers:Bob Tullius (53), Billy Hagan (51), Toivo Heinonen (50)
Youngest known drivers:Karl Durkheimer (27), Joe Varde (33), Boy Hayje (34)

Official Race Programme:

CoverEntry ListScheduleTrack Map
Programme Cover - Portland 3 Hours 1983Entry List - Portland 3 Hours 1983Schedule of Events - Portland 3 Hours 1983Track Map - Portland 3 Hours 1983