77 up master cylinder bore size?
Thread Starter
Melting Slicks
Joined: Jul 2005
Posts: 2,060
Likes: 46
From: winter haven florida
St. Jude Donor '12
77 up master cylinder bore size?
what is the bore size of a 77 master cylinder and is there any other diference in the 77 and up vs the 76 and earlier masters besides the bore sizes? i am doing a hydroboost conversion and was told i needed to change to a 77 and up master. i am interested in going with an aftermarket master so i need to know the specs on the 77 and up. thanks for any info guys. didnt have much luck with the search.
Le Mans Master
Joined: Apr 2007
Posts: 7,353
Likes: 72
From: Graceland in a Not Correctly Restored Stingray
'69-'76 PB master cylinders were 1.125", while the '68-'76 manual master cylinders were 1". All '77-'82 master cylinders are 1.125", but came with metric metering holes.
TSW
TSW
Safety Car
Joined: Aug 2000
Posts: 3,711
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From: San Antonio TX
The pushrod primary piston depth is different between the '76-'77 cylinders. As I recall, the pushrod recess for the early piston is ~1" deep, the '77 and on ~1/8" deep. The cylinders are interchangeable, but the guts are not.
Thread Starter
Melting Slicks
Joined: Jul 2005
Posts: 2,060
Likes: 46
From: winter haven florida
St. Jude Donor '12
thanks for the info guys. after doing some checking with the above info and looking at the hydro unit i have, i can use a 1.125 bore with with a shallow piston recess. this helps take some of the guess work out of it. that wilwood unit is one of the ones i was looking at!
