Radspieler Classic GmbH

Dyno | Engine test bench

Repair of historic engines

They accompany your engine project from disassembly, through construction to break-in and are always up to date. When it comes to paint, we also focus on originality and deliver our engines in the factory paint of the American manufacturers.

All of our engines are ground and built to the highest standards. Every engine is run in and tuned on our in-house test bench.

All dimensions, tolerances and specifications are summarized in an engine build sheet for later modification and for clarity. 

We are specialized in:

  • Buick Nailhead
  • Chrysler Small- & Big Block, Poly
  • Ford Small Block
  • Pontiac
  • Packard

We offer the following services in-house or together with our partner:

  • Immersion bath cleaning (ultrasound)
  • Material testing
  • Measurement of cylinder block, crankshaft and camshaft, pistons
  • Grinding, polishing and nitriding of crankshafts
  • Grinding cylinders
  • Reconditioning of cylinder heads (valve guides, valve seats, covers)
  • Set piston (shrink fit)
  • Complete assembly and break-in on the engine test stand
  • Tuning work for carburetor systems and ignition

An excerpt from our work

Buick 401 Nailhead

An emergency, because we were able to rescue this 401 Nailhead shortly before certain engine death and completely overhaul it with a lot of love. The block was ground to oversize, the cylinder heads reworked and the crank drive renewed. A true-to-original 4bbl conversion to the Edelbrock AVS2 completes this rebuild.

Plymouth 318 Poly

Known from Chrome&Flames, the 318cui Plymouth Poly engine was completely worn out, frost plugs cracked and incredibly coked up. Not only did we completely rebuild it with custom pistons and a camshaft ground especially for us, we also increased its performance.

Pontiac 389

58 years of wear and tear have taken their toll on this engine. A complete overhaul was necessary. The crank drive, cylinder heads and add-on parts had to be completely overhauled. Today, the block is ready for at least another 58 years of service and enjoyment in the classic Pontiac GrandPrix.

Chrysler 440

The 1968 Chrysler BigBlock engine was completely overhauled and completed with an original SixPack (3x 2bbl carburetor) setup. The Chrysler 906 cylinder heads were completely overhauled, a strong Comp Cams camshaft and new crank drive provide outstanding performance with driving dynamics.

We go to great lengths and work with original manufacturer manuals, some of which are over 100 years old. We are often faced with the challenge of having to manufacture certain spare parts ourselves because they are no longer available. A detailed repair requires a certain lead time. 

We have a waiting list for inquiries and will be happy to discuss the exact timing in person.

Frequently asked questions

Our test bench is primarily used for the acceptance and tuning of engines built in-house.
Please contact us for availability and a quote.

With our Dyno, we can not only test power and torque, but also driving resistance and driving profiles (e.g. simulation of road driving).

The following basic parameters are recorded:

  • Power (PS/kW)
  • Torque
  • AFR/Lambda
  • Cooling water temperature
  • Oil temperature
  • Oil pressure
  • Negative pressure

All our engines undergo the critical break-in phase on our in-house test bench. Running-in in the vehicle is no longer necessary.

All our engines run with our Super50 engine oil. As these are mostly flat-tappet camshafts, the oil must contain at least 1,200ppm ZDDP (zinc, phosphates).

All our engines run with our Super50 engine oil. As these are mostly flat-tappet camshafts, the oil must contain at least 1,200ppm ZDDP (zinc, phosphates).