I went to a swapmeet in indy today and looked at the high performance ford engine parts interchange book,its a good book but does not cover all the motors. In the book it says not to use truck heads as they are not for high rpm but what I want is a torque motor not a high reving motor and I want to check out the truck heads too,is there a book that covers all motors?. I allways heard that small valve heads produce more torque than big valve heads.is that correct?,i should of bought that book but want to find one that covers all FEs if possible.