Nice block, I just got one as well, but a street version.
Can I ask you to take few more pictures?
Would like to machine mine to copy the works version.
Here are pictures of mine:
Nice car, btw I love the compomotives..

Cheers
Hi,
Actually wasn't aware there were new entries in this thread as such! Hard to tell from your resolution, but it looks like a general road car engine to me.
Car has mainly been sitting for a while, due the fuzz with the brakes. Long story short: master cylinder was defect, looked like someone forgot about the safety screw and tried yanking it out of the casing, damaging on of the moveable alloy pieces, making it slower than it should. These internals were sourced of other master cylinder, and a bit of luck has it there's a hydraulic workshop at work, so we did a working hour special with washing and honing (is that the word in english?) of the housing that came off the car, just to be sure.
Why running the same old housing instead of just sticking with the new item bought you say? Turns out there is a PITA correlation in parts for urquattro!
- brake servo off car identical to new from Audi Tradition
- master cylinder off car had 35mm sleeve
- new master cylinders (I sourced both 25,4 and 23,81mm items) had 41mm sleeves
None of this makes senses to me, as even the master cylinder pictured at Audi Tradition shop looks to be 41mm sleeve type, so there is no available solution as far as I know. My 1988 edition car allegedly/apparently is running same dual piston calipers as 20V and early Audi S2, so I would see it natural to having the 25,4mm master cylinder on this car (as 20Vs do). Let's see what comes up from support functions at Audi (if any).
Last but not least, I managed to source a pair of Fuchs magnesium rims, although with type 43 numbers and scarsly 6 x 15 dimension. No good for anything, but perhaps could have made a nice replacement spare wheel in Gr 4 style fitted with 185/65 tyre. Also being out and about, I managed to trace down the genuine Bosch Motorsport ECU for the exact Lehmann 10V engine (Block, but still...) I have. It was nice, althought not a deal breaker for the "museum" engine I will patch together...some day...with whatever parts found suitable... :screwy: