I made some calls to some vendors today and got some insight to the direction I am going to go.
One vendors web photo showed my present style of master cylinder as a manual brake master? Hmmm?
They showed a different style (shape) as a power brake master.
Their tech had to put me on hold to answer my questions.
I asked another vendor about the AC Delco replacement master cylinder.
It is indeed stamped USA on its body but it is manufactured in China.
They couldn’t tell the bore size or piston length.
This master seems to be out of stock on several vendor sites.
I then called POL (Performance Online)after browsing their web site, and spoke with a tech.
He had answers for my application and explained the bore sizes and bore piston lengths.
Their products don’t match my current style of master brake cylinder.
I was told that I require a 1” bore with a deep bore long piston for the 72’.
Going make some more calls tomorrow.
Anyone have opinions or used POL brake products?
Thanks