I just got thru with my second truck's engine. A 1996 F-350XLT 4x4. Engine has been upgraded with 10.2 Speed-Pro Pistons, H-Beam rods, 268H Comp Cams, grooved lifter bore, Ported and 2.19 valved F3TE heads, ported intake, toilet capacity oil pump, Moroso septic tank. I have been experimenting with the stock speed density system before I install the Mass Air and FMS 42lb injectors, Hooker Headers. So far it runs " Satisfactory" with the T-Stat removed, Air horn chopped, K&N, Cat took a hike, Air Intake sensor now resides in the front bumper for maximum fuel and timing. Runs lean above 3500 rpm though with stock 24lb injectors.
A 2-4 mpg increase has been observed in an engine that I built for a friend. A low miles 97 460EFI engine. Upgrades include 10.2CR Speed Pro forged pistons, moly rings, Comp Cams XE 256 Computer grind, MSD 6-A, Cloyes Roller Chain. Cropped intake tube. Engine has been installed in a 88 Ford F-250 4X4. With about 2 Points in compression increase and 0 degree chain and cam, Flowmaster exhaust, feels like a 100hp increase minimum. It will smoke the 33 inch tires without effort, with some timing alterations, it pulled a 10,000lb trailer no problem.
FYI, there are some 460efi parts for sale on
www.808stuff.com 