I needded additional v/c clearance on my 72, so I converted from factory power disc/drum to manual disc/drum.
I used part # 101371 Master Cyl. that is Cardone brand with a deep hole and 1" bore.
I like the feel of it and it stops great while driving on the street.

At the track... It stops fine, but I need to get use to the different feel. I am slowing down a little too much and then getting off it and back on again right at the pull off.

The brakes will lock up faster during a turn now, but appear to be the same in a straight line.I was very pleased for the $25 I spent.
I have seen alot of threads here about manual master cyl. from 7/8 to 1 1/8, so just wanted to share my results.

what does it look like, squarish or oval looking cover?
i've been thinking about changing mine to a slightly smaller bore.

what does it look like, squarish or oval looking cover?
i've been thinking about changing mine to a slightly smaller bore.

It is cast , oval cap with dual bail clamps. Looks like the original M/C , but slightly larger. I think these were made for early vettes with manual disc.
If you look up a 70 vette manual disc.... it comes up the same part #

ok, one i have now has the same shape, it was listed for a 70's camaro with manual disc's though.
thanks :)