Oh, well! Shad beat me to it. I posted earlier but it seems to have disappeared But, he's totally right. They have THE alternative.
As a matter of fact, I've experienced a 100mm cilinder to crack under a bit too much boost. Well, actually it was 3 bar absolute. All due to a stuck boostcontrol valve. It even burned a nice round hole between the head and cilinder.
The old KaeferCup car you're referring to is probably one with the Holzapfel engine. I forgot who it was, could be dr. Gerold, but I'm not sure.
An engine like that would cost you around DM 30.000,- 6 to 7 years ago.
Cheers
Richard
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