Let's look at this realistically. They took off .005" to begin with, and you have another .008" max to take off to full clean up. Do you realize how small that total figure of .013" is? Stack 3 sheets of notebook paper up and there you go.
If the heads have never been shaved prior to this I'd say you have nothing to worry about. Shave them some more. If they have, you can always use thicker head gaskets to make up the difference to get them lined back up with the intake, or you can have the intake cut to match. Either way it's not a real big task to make things work. Have the chambers CC'ed to see just how much material has been removed if you want to be safe.
Also talk to the builder about valve train geometry. You'll have to shim the rockers to get things lined back up I believe.
Good luck.
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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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