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By '87, there shouldn't be a "US-spec". My information shows all 3.2 cars world-wide for '84-on at 108 ± 5 mm. So a car in good condition should sit between 103-113mm.
But for what it's worth, my car is sitting at about 135mm up front (significantly below the "official" euro/RoW spec). With stock size tires, my fenders measure around 25.5-25.75" depending on how full the fuel tank is. Seems plenty low enough to me.
Also, FWIW - make certain you are adjusting the TB's the correct direction. Tighten the adjuster should raise the car, loosen to lower.
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2018 718 Cayman 2.0
Priors - '72 911T coupe, '84 911 Carrera coupe, '84 944, '73 914 2.0
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