Adding 16 helicoils to a set of heads isn't going to account for $300 worth of material and labor. The only real cost that would add is the cost of the heli-coils and the time to screw them in since the holes are tapped either way you go. That's maybe $50 at most?
I've heard the reason is because the people selling TFS heads buy them bare and stick cheap @ss valves in them. If I were planning on buying TFS heads I'd buy them bare and have a local machine shop install some good valves in them along with a 3 angle valve job and correct springs for my setup.
I'd go with Canfields or AFR's if you're planning on buying them assembled.
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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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