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Master cylinder volume tests [message #369696] Wed, 18 May 2022 19:50
wally is currently offline  wally   United States
Messages: 643
Registered: August 2004
Location: Omaha Nebraska
Karma: 5
Senior Member
Bob Stone has tested a few masters for output volumes and found this

Original cast iron 16 and 8 CC's

Napa M2580 step bore 22 and 10 CC's

Dorman 630028 40mm 26 and 22 CC's

Modified Dorman 40mm 36 and 11 CC's


Wally Anderson
Omaha NE
75 Glenbrook
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