Master Cylinder: 67-72 GM w/ Drum Front (Bore 1" - Shallow Piston) This is a Delco water

This is a Delco water pump

Note: there are several qualities of these on the US market

tonque & gasket

Valve Seat Machine Style: 3-angle

Master Cylinder: 67-72 GM w/ Drum Front (Bore 1" - Shallow Piston) This is a Delco waterREAD DESCRIPTION ON LHS LOWER PAGE: Early Drum Brake shallow piston style GM brake master cylinder for 1967 thru 72 GM cars listed below with DRUM FRONT. Master cylinder LID.. may be either style shown here 67 72 LeMans GTO 68 69 Firebird 67 72 Cutlass 442 67 72 Buick Skylarks & GS Bore is 1" 25. 4mm SHALLOW PISTON Fits CHEVROLET BEL AIR 1967 1970 CHEVROLET BISCAYNE 1967 1970 CHEVROLET BLAZER 1969 1970 CHEVROLET BROOKWOOD 1969 1970 CHEVROLET C10