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in researching these heads and with Tom's expertise....The heads have 60 cc combustion chambers, a roatated spark plug angle (which requires the use of mac or FMS headers) these heads flow better than the GT40 heads on older mustang cobras....(at lower valve heights) and are equal to them at higher valve lifts.

the heads burn clean enough not to require the thermactor air pump system....

good bang for the buck at $400 IMHO
 
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