The GT-40 heads have different stem heights for the exhaust and intake valves, why I don't know (beancounter), you can put lash caps on the short ones and that should solve your problem.
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Proud owner of 93 Cobra #1928
306ci Forged flat tops, Windsor Sr iron heads, FMS X-303 cam, OE Cobra upper and lower, 65mm tb, 70mm maf, 24lb injectors, BBK shorties, Summit H-pipe and Flo-bastards
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