I'm Trying to remove my smog pump, and would like to know what is the size of the Torx bolt???

RS 91 TBI. 5.0. Vin E..

 

Im guessing 45, I think it is the same as the runner bolts on the tpi setup.

 

I think they're actually T-50. You can get by with a T-47 like I do sometimes but you will strip the bolts easier. Those bolts are definetly bigger then the runner bolts!! Maybe the same size as the intake bolts.

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1991 Z28 6.0 TPI

360 4 bolt main block, TrickFlow 23 degree heads, CompCams CS270HR cam, Harland Sharp roller rockers, Accel base, SLP siamesed runners, 52MM SLP Throttle Body, Hooker Headers, Flowmaster catback, MSD6A ignition, Home made ramair system, 2500 stall, bullet proof 700R4, aluminum driveshaft...

 

Thanks, I will try these sizes..