[beetle1303]

imo the best books on engine tuning are Haynes':

1. Four-Stroke Performance Tuning (ISBN 1 85960 435 8)
and
2. Forced Induction Performance Tuning (ISBN 1 85960 691 1)

Both are written by A. Graham Bell.

IMO read the 1st on first, cos it explains in great detail every aspect of a 4 stroke tuned engine, and i believe the 2nd one is like an expansion of the 1st...

1st covers
Cyl heads, Carburation, EFI, Exhausts, Cams& Valve train, Cranks (the whole Bottom end package), Ignition, Lubrication and Cooling and Power Measurement and Tuning

2nd covers
the first 4 chapters are on the history of forced induction, FI principles, turbocharger Knowledge, boost control, anti lag, Blowers and the same chapters, Charge air cooling, Fuel systems, Nitrous Oxide systems, exhaust systems, combustion/ Ignition management, Lubrication, Cooling, and about 5-6 more chapters...

Hope that helps

Chris