I just finished with a similar setup on my '91.
Had approx .050 -.080 p/v clearance with my stock flat-tops and 1.7 rockers.
TFS told me on the phone that the E-cam would be about 7 hp less with my combo. I went with the E anyway because it is well proven and has a CARB #.
Aside from killing the engine occasionally when I let the clutch out without feathering in some throttle, I like the cam.
I would call TFS just to be sure about your application. I've heard it both ways about the 86 pistons.......
Dan
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Spec Service (UHP), BFG G-Force KDW's, Turbo Coupe 3.55 rear w/disks, 73mm calipers, Stg 1 Twisted Wedges, TFS Street Intake, 70mm TB, E cam, Crane 1.7's, Aeromotive FPR, BBK 1 5/8 shorties, elec fan, FMS Al Radiator, Moroso Wires, Kenne Bell Ramair, March pulleys, Race Magnums, 190 lph Walbro, FMS Al Dshaft, D/S loop, MM 4point rollbar, FMS C spngs, strut tower brace, Tokico Illuminas, Prothane bushings, MM Lwr Conrol Arms, KB welded subs, Cervini Mach 1 hood/valence/side skirts/wing/airdam.
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