24lbs would be astronomical. Vacuum in an internal combustion engine is measured in inches. I'm not sure what the reading should be on a stock 5.0, but it will vary depending on the cam, intake, TB/EGR spacer, etc. My car ran great with 15 inches and the brakes worked like they were supposed to. A lot of my friends that have ran the F303 cam said they had 15 inches of vacuum as well.
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Project: 1988 Coupe - EFI 5.8L Twin Turbo with Victor intake, Canfield heads, F303 cam, March aluminum underdrive pulleys, TKO (or T56 if funds permit), PBR twin piston calipers and 13" rotors up front, 94 Cobra rear calipers and 12" rotors on the rear, 3.73's, Griggs K-member, tubular front control arms, torque arm and panhard bar, polished 99 Cobra wheels.
"The GR-40 kit installation is now complete, and the humble Fox-chassis car will now out-corner and out-stop a ZR-1 or a Viper, and support massive horsepower additions with perfect balance."
Griggs Racing
ICQ# 42269241
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