New 259 pistons .010

[pszikszai]

I ran out of NOS .030 pistons.
However I have a set of NOS .010 set left.
I never had a block bored less than .030.
If the block is worn less than .010 then is it advisable to
have the block bored to .010?
Also has anyone any .010 oversize rings?
I never heard Studebaker having them.
Trying to line up projects for next winter.
Thanks
Paul

[Alan]

Back in the 50's and 60's it was a very common over bore. It seems like everybody now wants to go .030". But you can still find rings, either Egge or Grant if the Stude vendors don't have them.

[PackardV8]

Greetings, Paul,

1. Most machine shops settled on .030" because that always cleaned up 99% of the engines they see, and they could order parts ahead of time. With an overbore, less is more. The only way to know if a block will clean up completely at .010" is to try it and see. Since the boring and honing only removes .005" per side, if there is much taper/ridge, it will need a larger bore to completely clean up.
2. If our Studebaker vendors don't have .010" rings in stock, you can find them at any big parts house. Just remember, the rings don't have to say Studebaker on the box. Look for anything with a bore of 3.5625" + .010" - these rings were available from GM for the I6-194", Ford Y-blocks and many other older engines. A good parts counter man can come up with several interchanges for you.
3. Also remember, 99% of all Studes were and are running down the road with several thou of taper in the cylinder walls. If your .010" bore leaves a shadow of ridge at the top after boring and honing, it will still be better than most. If cost is a major factor in this build, fresh rings in a bore with a thou or two of taper will most likely run longer than you will live and be within the Service Manual spec of max of .005" taper after you are gone.

Your car, your money, your decision.

thnx, jack vines




PackardV8

[Mike Van Veghten]

The rings don't have to be Stude rings....???...darn...I've been looking for a set 2mm thk. top rings for a Stude and can't find any. Now that I know that...can I just to to a ring manufacturer and ask what they have?

Just funnen!!

Mike

[N8N]

All the rings care about is bore size, groove size, and cylinder wall material - what they don't know won't hurt 'em

nate

--
55 Commander Starlight
http://members.cox.net/njnagel

[TX Rebel]

Standard replacement rings are designed for zero to .020, so use them with the .010 pistons...

Barry'd in Studes

[pszikszai]

I was thinking doing the suggested solutions.
It is good to get verification of people who know or have done
what you are planning on.
Thank you all.
Paul

[wally]

Though PackardV8 pretty well answered the question, I'll throw in 2 cents. .010 is an unusual oversize. Cylinder wear is often to the point where it would not clean up all of the cylinder bore--and the shop may do several holes OK, before hitting a bad one, which wastes your time and theirs. Years ago, I owned a 500 Cadillac engine that had low mileage, but had corrosion from sitting in storage while disassembled. Honing did not remove the rust pitting, but boring it .020 sure did.

"You Can't Have Everything--Where Would You Put It?" ---comedian Steven Wright