Whilst these cars visually resemble the road going 3.0 RS, (M471) they were built by the Porsche race department to (M491) RSR specification
Engine, Transmission & Suspension
• 3.0-litre Mechanical Injection Type 911/74 RSR engine (no. 6840034)
• 95 mm bore x 70.4 mm stroke, 10.3:1 compression
• 316 hp @ 8,000 rpm / 310 Nm (229 lb-ft) @ 6,100 rpm
• Six individual high-butterfly throttle bodies
• Twin-plug ignition
• 110-litre plastic fuel tank
• 5-speed gearbox with oil pump
• Limited-slip differential (80% lock)
• Four-piston 917 brake calipers with cross-drilled discs
• Dual master brake cylinders
• Bilstein Shocks
• 9J and 11J x 15 Fuchs alloy wheels
• Goodyear radial racing tyres
Bodywork
• Steel front and rear RSR flared wheel arches
• Welded chassis reinforcements
• Rear shock tower reinforcements
• Front fibreglass RSR bumper with centre oil cooler
• Rear fibreglass RSR bumper
• Fibreglass whale tail (with Daytona Gurney Flap)
• Fibreglass front hood with balsa reinforcement
• Plexiglass windows
• Windshield clips and rear window straps
• Rear blanking plate instead of Porsche reflector
• Black headlight rings, cover and driver’s side door mirror
Interior
• Three-spoke Sport steering wheel
• Lightweight Recaro racing seats
• Lightweight door panels with release strap
• Black headliner and needle felt carpets
• No sound deadening
• Clock and radio blanking plates
• 10,000 rpm tachometer
Safety
• Rear roll hoop
• Racing seat harness
• Heinzmann fire extinguisher system
Provenance
Roger Penske, Pennsylvania, USA (acquired new in 1973)
Greg Egerton, McAdenville, North Carolina (acquired from the above in 1974)
Vasek Polak, Manhattan Beach, California (acquired from the above in circa 1975)
Tom Linton, Sana Fe, New Mexico (acquired from the estate of the above in 1998)
Jerry Seinfeld (acquired from the above in February 2005)
Fica Frio Collection, UK (acquired from the above via Gooding & Co in 2016)
Private Collection, Switzerland (acquired from the above in 2020)
Private Collection, Switzerland (acquired from the above in 2021)
After the 1973-74 IROC series, all sixteen cars were then individually sold by Penske to private buyers. This car was sold to Greg Egerton, who raced it in a Trans Am race at Lime Rock just a few months after its race in Daytona. It raced in several important US races during 1974 and 1975, where it was driven by Elliot Forbes-Robinson, Grey Egerton, Milt Minter, and Cale Yarborough. It would go on to win an IMSA race at Laguna Seca and secure Top-10 finishes at Ontario, Daytona, and Riverside. After the 1975 racing season, Mr. Egerton sold the RSR to Vasek Polak. Mr Polak had the car refinished in white with red and blue stripes and fitted it with an earlier 2.8-liter engine. It remained in static storage for many years.
Tom Linton of Santa Fe, New Mexico purchased the car in May of 1998 from Vasek Polak’s estate.Mr. Linton commissioned Jim Torres of Burbank Coachworks to complete a comprehensive and exacting restoration, bringing it back to its original IROC livery and specification. During the work, an original type 911/74 IROC series race engine (number 6840034) was sourced and installed. By 2000, the IROC RSR had been completed restored to its original Light Yellow livery and specification. It made its restoration debut at the Amelia Island Concours d’Elegance in March of 2000, and later actively campaigned in historic events, including Rennsport Reunion 1 and Il.
We are delighted to offer for sale this beautifully presented genuine example, which has been constantly well maintained since being faithfully restored by Jim Torres of Burbank Coachworks and remains fitted with one of the original IROC series numbered (684034) type 911/74 RSR engines – last rebuilt in 2015.
An immensely historic Porsche 911 RSR, offered for sale with all UK duties paid and UK V5C road registration and number.
1974 
1975 
