When i installed my 1.7's a little while back, i knew the instructions said 1 turn, but that was hard for me to determine, since my torque wrench would hit the hood before i could go 3/4 of a turn, i didnt use shims, but may have needed them, i guess it was'nt to far off since i felt, and saw a pretty good gain in performance, and e.t.s and mph, i didnt trap over 100mph until i insatlled my crane rr's, took me a couple hours, and im happy, almost in the 12's with stock heads cam and intake.
if you think it opend your valve then use shims, i doubt you need them unless you have had your heads milled, or machined at one time.
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's.
race weight 3,160
12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear
13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear
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