Need the 411 on 25-valve I5

[David]

Does anyone know where I can get more information on the 25-valve (5-valve per cylinder) I-5 that was used in the Typ44 at the  Talladega Speed Way?
All I know is On March 24th, 1986 an Audi 5000CS Turbo Quattro set a one-lap closed course speed record for four-wheel drive vehicles at Talladega Speedway. The Audi, with Bobby Unser at the wheel, reached a on-lap average speed of 206.825 mph over the 2.66 mile high-banked speedway. A pic of the 25 valve head can be seen at http://members.cox.net/duandcc/pictures/1987.5CGT/25valve_I5.jpg
But I want more information, like more pics of the engien, specs, whether the head was ever made into a production unit, etc...

Thanks,