The cast iron material made master cylinder fits for Chevrolet and GMC. There is only one port in left side with the thread size of 1/2-20". The bore diameter of MC39546 is 1.5" equal to 38mm. The intercharge numbers are M39546, 13-39546, 10-39546 and MCA39546.
The application details:
Chevrolet
C60 1985-79
C70 1982-79
GMC
C6000 1985-79
C7000 1982-79
