mike coletta

How do I tell the difference between a power vs. non power oem 63 master cylinder ??

prestige6

Power has a bleeder screw an Non power doesn't. and a picture of the complete unit would also help.

W Guy

This is a non-power master. The boss is there for the bleeder but it is not tapped. Also notice the thumb screw holding down the lid. Casting number is the same for both.

mike coletta

Got it!!!!!! Thank you guys.

MikeM

Make sure the cylinder is a 7/8" bore if you are going to put it on a Corvette. Pass car, Corvair and Chevy II used the same cylinder as standard only in a 1" bore. Only if they got metallic brakes did they get the 7/8" cylinder.

mike coletta

Thanks Mike, it's a 7/8 inch bore

Frankie the Fink

I sold a non-power '63 M/C a while back to a forum member for $200 IIRC.

However...they are making a fairly decent repro now so I think the originals may have taken a value 'hit'...

Correct finish, stamping and a Delco-Morraine piece with correct casting number for about $175... All the vendors have them including Covertte Stainless Steel Brakes Inc...

W Guy

As long as you find one with that casting number, you're good. They're all 7/8"

Verne

I wonder if the repros have a date code? If so, I'm sure they're all the same.