i got the 58cc's because i wanted to increase the compression instead of decreasing it. i didn't at the time plan to run a supercharger, so i went with the 58 cc's. 58cc's are good for a nitrous or natural aspirated motor. 64 cc's are good for blown motors. my valvetrain fit quite nicely to tell you the truth, if i had to do it all over again, i would probably purchase the 1.6's with the e-cam. it is better to get your lift out of the cam instead of the rockers for better valvetrain geometry, but everything worked out perfect. it still runs strong. i think the gt-40x's come with 1.90 intake and 1.54 exhaust. you should be fine with 1.6's and a e-cam, even safer with the b-cam. i would run the e-cam
take it easy
brian
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GT-40X heads(58cc), Cobra upper and lower, 75 mm Bullet, Moroso fenderwell induction, FRPP 65mm TB, 24# injectors, black magic electric fan, phenolic spacer, 1.7 crane cobra roller rockers, crane 2031, BBK 1 5/8 equal length hearders, 2.5 inch off road pipe, 2.5 flowmaster catback, FMS 3.55 gears, T5-Z transmission, FRPP aluminum driveshaft, svo heavy duty clutch, mcleod bullet proff bellhousing, BBK adjustable cluth quadrant, hurst billet shifter, lakewood subframes, BBK strut tower brace, BBK 2pt lower cross bar, FMS 190 lph fuel pump, crane ps91 coil, FMS street pulleys, and 300+ race wires. All thanks goes to my wife sheri, jason, jeff, robby, my dad and all others you helped contribute. most importantly GOD!!!
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