As far as i know off the front, but early 55 may be slightly different

 

The OEM MC has a brass block in front with copper crush washers on each side (front and back) and is secured by a special shoulder bolt. The block can be turned 360 degrees before tightening the bolt but I think the line comes in at about 5 o'clock, as you're facing the MC. There should be Delco Moraine 1 " cast into the side, I think. Here's a link: http://www.trifive.com/garage/55 Chevy Assembly Manual/5-3.gif

The 57 MC is different, it's all one cast piece, no brass block, and the line comes in underneath the MC. Almost all aftermarket MCs are cast one piece, no block. Link to 57 MC: http://www.trifive.com/garage/57 Chevy Assembly Manual/5-1.gif

 

The OEM MC has a brass block in front with copper crush washers on each side (front and back) and is secured by a special shoulder bolt. The block can be turned 360 degrees before tightening the bolt but I think the line comes in at about 5 o'clock, as you're facing the MC. There should be Delco Moraine 1 " cast into the side, I think. Here's a link: http://www.trifive.com/garage/55 Chevy Assembly Manual/5-3.gif


This is correct for 55. :anim_25: bowtie-trifive :gba:

 

The 57 MC is what I`m used to seeing the most there may be other stuff in the library :anim_25:

 

Thank you both for the replies. Somewhere along the line, someone changed the MC because the very front is cast closed. The brake line threads into the side near the front. I found a MC off Craig's list and is exactly like the drawing. Thanks again for clearing this up. That's why we all belong to this site because of people like you.
Dennis

 

There's a restored correct one on ebay right now - http://www.ebay.com/itm/170989495789?item=170989495789&viewitem=&vxp=mtr

 

Not all 57's use the direct line into the casting. Most were just like the 55-6. Those are later 57's and were used for many years after that. It is this casting that was used by many replacement M/C companies that supplied NAPA and other outlets. This is the most common replacement found today.

55wagoncrazy

 

mine is on the bottom, and it matches the assembly manual dated 5/8/56

 

That's the same exact one on Ebay I got on Craig's list for $15. The cast number and all. I'm taking it to the local ceramic coater (to match the exh. manifolds) and then sending it down to LA for a SS sleeve and rebuild. Thanks to all of you for the replies. Always learnin even after all these years. Wow!!! That's a pretty motor.

 

That's the same exact one on Ebay I got on Craig's list. The cast number and all. I'm taking it to the local ceramic coater (to match the exh. manifolds) and then sending it down to LA for a SS sleeve and rebuild. Thanks to all of you for the replies. Always learnin even after all these years.

If you have a '55 then the master cylinder is the type shown here - http://www.trifive.com/garage/55 Chevy Assembly Manual/5-2.gif - and in the ebay link referenced above. The one in jerrspud's picture is only for late 57's.

 

here is my original 55 master cylinder