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Porsche 911 Modified

Porsche 911 Modified

Coupé, 1973


  • 3.0 RSR recreation
  • Rebuild engine
  • Road legal and expired historic passport

Porsche 911 S 1973 – RSR 3.0 Spec “Woodstock”

A unique car with a rich history and highly attractive specification. If you are looking for an adventure tool on the road or the track, look no further. The engine has recently been rebuilt by a renowned local Porsche specialist and puts out 260hp and has a few hundred km on the clock since then.

Price: EUR 95,000 Reserved


TwinSpark Racing & Engineering BV
Rhijngeesterstraatweg 60-A
2341BV Oegstgeest
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Porsche 911 S 1973 – RSR 3.0 Spec “Woodstock”

A unique car with a rich history and highly attractive specification. If you are looking for an adventure tool on the road or the track, look no further. The engine has recently been rebuilt by a renowned local Porsche specialist and puts out 260hp and has a few hundred km on the clock since then.

The son of the present owner baptized the car “Woodstock” because it is yellow and it flies. The name stuck…

Delivered in Germany in 1974 as a 911S, Woodstock was converted to 2.8 RSR body and engine spec in the early 1990s. It raced successfully in the German Youngtimer Trophy until it crashed severely. The then owner didn’t come up with the cash to pay for the rebuild and the repair shop sold the car in pieces to cover the cost. As a consequence, the bare rolling chassis stood unused for years, until the present owner bought it and started a decade long rebuild process.

Between 2006 and 2014 Woodstock was steadily improved until it had its present specification. The specification list is a treasure trove of desirable parts (see below). Woodstock participated in the Dutch Youngtimer and Historic GT and Touringcar Championship. The car participated in a variety of R Gruppe events, as the present owner was the founder of R Gruppe in Europe (2007). Woodstock completed four 4.000 km BergMeister Tours through the French Alps without a hitch.

The way Woodstock is set up, it functions well both as a road and track car. On Alpine passes it carves hairpins sharply and on track it is firm enough to be an encouraging chassis (adjustable stabilizer bars). The car has been lightened as much as possible without compromising reliability. So it has no sound deadening, nor interior finishing, except for a couple of Recaro S style seats, covered in bespoke tartan wool. It has lexan rear quarter windows and rear windshield. There is no heating in the car, but it does have a de-misting blower. The original wiring loom has been replaced by a rally harness with all fuses and relais accessible in the dashboard.

Woodstock is a hard core motor cycle on 4 wheels for the enthusiast who seeks to be engulfed by the pure, raw sensation of spirited driving, in te way only an early 911 can offer. The next owner could continue to use Woodstock as the present owner has. But with a few touches, Woodstock could be an ideal historic rally or race car. The car has an expired Historic Technical Passport and re-registration at FIA should not pose any material challenges. Woodstock is road-legal and has a Dutch license registration.

The present owner said: ”Woodstock has been an adventure in itself and the car has been a conduit to meeting a string of Porsche aficionado’s. I have lovingly taken care of it for many years and set her up to be enjoyed for, hopefully, many decades to come. Driving my modern Porsche I recognize the roots and DNA which the 911 RSR passed on to the next 911 generations. The next owner is a lucky person!”.

Woodstock is priced to sell at € 95.000,=.


  • Chassis number 911330XXXX, delivered in Germany in 1974
  • The car is road legal.
  • The car is in compliance with FIA App K and has a homologated roll cage.
  • Oil cooler mounted, in front of frontal cross beam.
  • New in period dashboard gauges mounted. Personalized gauges.
  • Wiring loom Tuthill Rally Spec.
  • Foamed original fuel.
  • Recaro S type seats, bespoke Tartan seat centers, excellent condition.
  • Rally intercom set.
  • Sabelt fire extinguisher.

 Suspension, Braking:

  • RSR style trailing arm mounting points and 1973 RSR spec short steel trailing arms.
  • Bilstein HD dampers
  • H&R coil-over springs
  • RSR original spec wheel hubs (smaller)
  • SC bearings
  • Ribbed 1973 spec RSR brakes (Zuffenhaus; modified)
  • Original spec brake hats, gold colored
  • Original RSR spec disks 28mm all around
  • RSR spec E-brake set up (lightweight)
  • RSR adjustable stabilizer bars front and rear
  • Medium compound suspension rubbers all around
  • Turbo spec steering arms
  • Braid 16 x 8 x 10 inch Fuchs-style wheels, mat finish


  • 3.0 RSR spec engine, standard style butterflies.
  • SC 3.0 donor block
  •  Porsche steel connecting rods
  • JZ pistons
  • Capricorn cylinders
  • Double ignition holes in heads
  • Porsche valve springs and hats
  • Adjustable rockers
  • 41-39mm intake-exhaust ports
  • Double, breakerless ignition unit
  • Double Bosch 6 pins HKZ boxes
  • Magnecor spark plug wires, extra isolation
  • Standard size fan and housing (245mm)
  • Mechanical injection pump, Bosch.
  • Standard MFI fuel injection lines
  • Original fuel filter housing
  • Cold start mechanism based on solenoid, not cable.
  • Equal length, steel headers and steel muffler
  • WEVO blue Semi Solid Engine Mounts


  • Very good condition
  • Standard gear set 915
  • 7:31 crown wheel and pinion
  • Limited Slip Differential 40%
  • Mechanical cooling
  • Swepco oil
  • WEVO blue Semi Solid Transmission Mounts
  • Standard shift rod
  • WEVO Precision Shift Joint
  • WEVO 915 Billet Shifter Silver

Continue reading


Year of construction: 1973
Initial registration date: June 1973
Model: 911 Modified
Body: Coupé
Series: 911 Backdate/Modified
Mileage: 35000 km
Power: 250 HP
Cylinder capacity: 3,0 Liter
Steering: left
Transmission: Manual
Drive: Rear drive
Fuel: Gasoline
Interior color: Black
Interior material: Fabric/Leather combination
Exterior color: Yellow/Gold
Manufacturer color code (exterior): Signalgelb 114 / 7210
Vehicle inspection valid until: June 2021
Condition: Partially restored
New/Used: Used car
Ready to drive: Yes
Registered: Yes
Country of first delivery: Netherlands

More Information

Elferspot Magazine Porsche Backdate/Modified

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Maarten Sellmeijer

Maarten Sellmeijer from TwinSpark Racing & Engineering BV looks forward to your questions and is happy to help you.

Porsche 911 Modified

Price: EUR 95,000

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