> Unser drove for the world speed record. There was never a 25 valve head > used, > especialy in a racing application where a 5 valve head doesnt offer many > benefits over a 4 valve head. > ... Oh ... OK ... thanks for the info ... I guess that is why they were banned from use in the BTCC (and/or some other touring car championship series) ... Steve Buchholz San Jose, CA (USA)