The late Bob Wallace was a development test driver for Lamborghini in the 60s and 70s during the time Lamborghini produced the P400, P400S and P400SV Miuras. In 1970 Wallace was involved with the development of the Lamborghini Miura P400 Joto, Spanish for the letter J, which conformed to the Federation of International Automobile J Racing regulations.
Bob Wallace revised the V12 Engine and Power Train in the 1969 Lamborghini Miura P400S restoration to the SV specs and also made several performance upgrades. Some additional upgrades Wallace did to this Miura Engine include: Lighten, Balanced and Aligned the Power Train Gears. Machined both Heads and installed Manganese Bronze Valve Guides with all New Viton oil seals. Dropped the V12 Engine Oil Pan 20mm and added Baffles on the inside of the Oil Pan. Both Engine and Gear Oil Capacities are increased. Installed a Regulated Fuel Pressure System with a Fuel Tank Return System. Matched the Four Weber Triple Carburetors to the revised Fuel Pressure Delivery and Return System. Lightened the Timing Gears and dialed in the Cam Timing. Detailed records and receipts are available for all the work performed by Bob Wallace Auto AZ, USA.