When I was searching around for a replacement bmc I read this on Z1motorsports "The 1 1/16" Bore Master Cylinder replaces original units on cars built prior to 01/1991. Build dates from 02/1991 onward used a 1" bore. However cylinders are interchangeable across all year model Z32 applications." I ended up buying, but never installing a Centric 13042603 bmc which is indeed 1 1/16" or 17/16". Still under the return period from ACWhitney so I'm definitely gonna mail that back. Don't currently have a need to replace my bmc but I'll be going for the 1" version in the future just to lighten the pedal up a bit. I can lock up the tires and I didn't notice any pull or vibration under braking so I'm just gonna try and get used to it for now. Thanks for the info
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