These three books directly discuss plumbing. If you only want to buy one, go for the Nuts, Bolts, Fasteners and Plumbing Handbook. Other fine race car prep books by Carroll Smith may be found Here.
Prepare to Win, Carroll Smith, Aero Publishers, ISBN 0-96516-003-3
Engineer to Win,
Carroll Smith, SAE International, 1984, ISBN 0-87938-186-8
Buy it from Powell's Books
Carroll Smith's Nuts, Bolts, Fasteners and Plumbing Handbook,
Carroll Smith, SAE International, 1990, ISBN 0-87938-406-9
Buy it from Powell's Books