Motorsport Monday: 1975 Porsche 911 3.0 RSR

The Porsche 911 is a versatile vehicle when it comes to motorsport. Rallying, LeMans, even the International Race of Champions employed the venerable rear-engined sports car in competition. This 1975 911 3.0 RSR is a tribute to a 911 campaigned by famous Porsche mechanic, dealer and racer Vasek Polak. It was Polak who, in 1959, opened the first Porsche only dealership in the United States. That RSR was campaigned successfully in IMSA in 1975 and would be raced until 1981, racking up more victories along the way. This 911 3.0 RSR is a recreation of that impressive machine, on offer in Southern California.

CLICK FOR DETAILS: 1975 Porsche 911 3.0 RSR on eBay

Year: 1975
Model: 911 3.0 RSR
Engine: 3.0 liter flat-6
Transmission: 5-speed automatic
Mileage: 500 mi
Price: $89,990 Buy It Now

1975 Porsche 3.0 RSR Tribute

Ex-Jim Busby/Vasek Polak Racing

Over $200,000 Invested

VIN # WP0AB0915ES122102

ENG#3380118 (Aluminum Case)

Less than 10 hours on current engine
White with Beverly Porsche Audi Livery

Signed by Jim Busby

Custom 915 5-speed Manual Transmission

Clean and Clear California title

No Accidents.

In 1975, Jim Busby and Vasek Polak purchased a factory 3.0 RSR to compete in the 1975 IMSA season. It did reasonably well starting and finishing 8 races and finishing in the top 10 at all of them. The car continued to be raced both professionally and with SCCA through the 1981 season with a top ten finish (in class) at the 12-hours of Sebring in 1981. The owner of this tribute RSR was always a big fan of Jim Busby, Vasek Polak, and the 3.0 RSR. So, when the chance arrived to build a vintage racer, he couldn’t resist.

The current owner is a semi-professional racer who has competed heavily in not only POC (Porsche Owner’s Club), but also Grand Am. In 2003, a fellow P.O.C member had a 1984 Porsche that was made to look like 964 Turbo with a 3.6 engine installed. He primarily used it for time trials. The current owner purchased it and for the next two years did some club racing with it. In 2005, he decided to start his goal of building a vintage RSR style racecar. So, he enlisted the help of Kevin Roush with GAS Motorsport in Upland, CA. Outside of the original purchase of the car, this owner invested another $137,000 into developing an amazing and quick vintage racecar.

Here are some highlights of the mechanical components:

Full RSR coil over suspension

Charley bars

Original real 2.0L aluminum

911 S MFI System

MFI Fuel pump

46mm magnesium stacks

Mahle 2.9L pistons and cylinders

Early 911 distributor

Ollies prepared case/bored for 90mm cylinders

Shuffle pinned

2.7 Crank machined and polished

2.7 Carrillo rods

2.7 heads ported/polished and flame ringed

Late cam towers/chain housings with Carrera tensioners

Titanium valves

Carrera oil cooler

Elgine Billet Cams

Squirters for pistons

GT3 R oil pump

7:31 Ring and Pinion

Race gears 1,2,3,5

LSD 80%

Wevo gateshift

Dogteeth race gears

$15k spent building gearbox alone

Tilton Twin Disc clutch package

Custom flywheel

Tall 1st gear for rolling starts

Porsche 917/930 big brake system

Car weighs 2,150 lbs

After tuning and development, he decided to enlist the help of Vision Motorsports (one of the top independent Porsche specialists in Orange County). The owner of Vision, Dwain Dement, was previously one of the managers of Andial. He wanted to give the car the look of a period-correct RSR to match the mechanicals. He had Dwain built a tribute to the Jim Busby/Vasek Polak 1975 RSR. The execution came out so well that Dwain even got Jim Busby to sign the dash. The cost for the conversion came out to another $31,000.

All in all, this owner has invested over $200,000 building, developing, and testing this RSR and he has less than 10 hours of track time on it. The car has competed in a few HSR, VARA, and SCCA events. One of the first times out, it won GT3 class and set the track record at Phoenix with the SCCA! This vehicle has a Cool suit bracket and mount. We have receipts of all the recent work performed and are included with the sale.

If you have any questions, please do not hesitate to contact Paul at 714-335-4911 or paul@autokennel.com

It’s often hard to put a value on tribute vehicles and oftentimes more money is invested than what the seller can reasonably figure to recoup. Then you add in the competition nature of the vehicle and the potential buyer field lessens a bit more. Still, the asking price seems within the realm of reasonable considering the level of work undertaken and considering what a real RSR would run you, this car seems a bit of a bargain.

-Paul