Rare Car Archive

Makes › Porsche Germany › 911 › Original 911 › 911 Carrera RSR 3.0 IROC · Factory competition · 1974 Ultra Rare

Porsche
911 Carrera RSR 3.0 IROC

RSR 3.0 cars built for the International Race of Champions series.

IDENTIFICATION CARD · PORSCHE 911 CARRERA RSR 3.0 IROC 1974
No licensed photograph yet. Photographs are published only when their licence permits it.
15BuiltIndependently researched
0Chassis documentedin this archive
?SurvivingNot yet verified
Contents
  1. 01Overview
  2. 02Production & history
  3. 03Specifications
  4. 04Colours & options
  5. 05Individual cars
  6. 06Reference

01Overview

At a glance

Built
15 Built
Years
1974
Engine
Rear-mounted flat-six · 3,000 cc / 3 LFactory: 3 L
Power
246 kW / 335 PSFactory: 330 hp · converted
Top speed
Not yet verified
Body
Not yet verified
Designer
Not yet verified
In this archive
Not yet verified
Surviving
Not yet verified

Sources and any conflicting figures are in the sections below.

Why it matters

These 15 RSR 3.0 cars were built for the first International Race of Champions, which put stars from Formula 1, Indy car and NASCAR into identical Porsches. They are the 3.0-litre RSR in a uniquely documented series context.

How rare is it?

Six separate kinds of rarity – never combined into one number.

Model rarityUltra Rare 15 · Built1
Specification rarityNot yet assessed
Colour rarityNot yet assessed
Individual rarityNot yet assessed
Historical rarityNot yet assessed
Survival rarityNot yet assessed

Each kind of rarity is rated separately and never combined.

02Production & history

Production

Every figure says what it counts.

What is countedFigureBasisStatus
Total model productioncars built for the IROC series (12 driver cars + 3 reserves) 151 Factory production Independently researched

Independent counts (e.g. engine and colour) are never combined into a calculated figure. Surviving examples are never presented as original production.

History

The IROC series was created by Roger Penske, Les Richter and Mike Phelps, and its inaugural 1973/74 season used fifteen RSR 3.0s: twelve for the drivers and three reserves, sold new to Penske Productions. The cars used the new 3.0-litre engine with twin-spark ignition, around 330 hp, GRP panels and plastic side windows, flared arches, a front air dam and the 'tea-tray' rear spoiler, with brakes and centre-lock wheels from the 917 parts bin. The field included Emerson Fittipaldi, Mark Donohue and Richard Petty.

Variants

How each version differs from the standard 911 Carrera RSR 3.0 IROC.

No variants documented yet. Have a source? Contribute it.

03Specifications

Technical specifications

Engine

Engine familyNot yet verified
Engine code911/752 Independently researched
LayoutRear-mounted flat-six2 Independently researched
Displacement 3,000 cc / 3 LFactory: 3 L2 Independently researched
BoreNot yet verified
StrokeNot yet verified
Compression ratioNot yet verified
ValvetrainSOHC3 Independently researched
Fuel systemNot yet verified
Power 246 kW / 335 PSFactory: 330 hp · converted2 Independently researched
Power atNot yet verified
TorqueNot yet verified

Transmission & drivetrain

GearboxFive-speed manual2 Independently researched
Gears52 Independently researched
Driven wheelsNot yet verified

Chassis, body & dimensions

ChassisNot yet verified
Front suspensionIndependent, torsion bars, shock absorbers3 Independently researchedSource does not separate front and rear.
Rear suspensionIndependent, torsion bars, shock absorbers3 Independently researchedSource does not separate front and rear.
BrakesFour-wheel ventilated and drilled disc brakes3 Independently researched
SteeringNot yet verified
Body constructionSteel 911 shell with GRP panels and plastic side windows2 Independently researched
WheelbaseNot yet verified
LengthNot yet verified
WidthNot yet verified
HeightNot yet verified
Front trackNot yet verified
Rear trackNot yet verified
Kerb weight 898 kgFactory: 1,980 lb · converted2 Independently researchedStated for the 1973/74 RSR in general (GRP panels, plastic side windows); not stated as dry or kerb.
Dry weightNot yet verified

Performance

Maximum speedNot yet verified
0–100 km/hNot yet verified
Fuel tankNot yet verified

“Not yet verified” means no source has been checked for that value yet. Nothing is estimated to fill a gap.

04Colours & options

Factory colours & interiors

Original paint and trim, with the number of cars in each where a source gives it.

Not yet documented. Have a source? Contribute it.

Factory options & codes

Codes are shown exactly as written by the manufacturer.

Not yet documented. Have a source? Contribute it.

05Individual cars

Chassis register

Every documented car, with its colours, history and where it is now. Open a row for the full record. Known chassis are not automatically authenticated originals.

Not yet documented. Have a source? Contribute it.

Competition history

Every race result of the individual cars, in date order. Click a chassis number to open its full record in the register.

Not yet documented. Have a source? Contribute it.

Auction & sale history

Documented public sales of the individual cars. Click a chassis number to open its full record in the register.

Not yet documented. Have a source? Contribute it.

See one in person

Museums where an example of this car can be seen.

No example is documented on public display yet. Have a source? Contribute it.

06Reference

Identification guide

How to tell an original from a replica or later conversion.

IROC RSRs were sold new to Penske Productions and should carry a 3.0-litre 911/75 'butterfly' racing engine (or documentation of it). Body features include GRP panels, plastic side windows, flared arches, front air dam and the tea-tray spoiler, with 917-derived brakes and centre-lock wheels.

Sources

Each number links to the exact facts it supports.

  1. 1
    1974 Porsche 911 Carrera RSR 3.0 IROC | RM Sotheby’s Level B
    • 15 cars built for the IROC series (12 driver cars + 3 reserves)
    Accessed 2026-11-11
  2. 2
    1974 Porsche 911 Carrera RSR 3.0 IROC (Monterey 2021) Level C RM Sotheby's
    • correct 911/75, 3-0-liter 'butterfly' racing engine
    • 911/75, 3.0-liter racing engine
    • a new 3.0-liter engine with Bosch twin-spark ignition
    • power increase to 330 horsepower
    • five-speed manual
    • By using GRP panels, plastic side windows
    • RSR barely tipped the scales at 1,980 lbs
    Accessed 2026-11-12
  3. 3
    1974 Porsche 911 Carrera 3.0 IROC RSR Level C Gooding Christie’s
    • 2,994 CC SOHC Type 911/74 Flat 6-Cylinder Engine
    • Fully Independent Torsion-Bar Suspension with Shock Absorbers
    • 4-Wheel Ventilated and Drilled Disc Brakes
    Accessed 2026-11-12

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