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Had a Biturbo and daily drove it for several years. I parked it when it tossed the timing belt for the third time.
When they are running right, they are a hoot to drive, but you have to differentiate between maintenance and repairs. Maintenance is fairly easy and cheep, repairs are random, and can be expensive.
All in all, I say go for it.
 

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Yes, the Biturbo is an interference design. Heads off, rebuild top end of engine. Not cheap, or fun. Setting tappets using valve stem shims ( tiny cups of various thicknesses) is an art. If you get it wrong. the noise will cause the computer to dump boost, and the car runs like crap.
Edit: very interesting design with 2 intake valves, one small, one large, actuated by a single cam lobe.
 
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