Dimensions for .083" pistons and removed liners

[Eodcoduto]

I see a lot of references to removing the .040" steel sleeves in a 221 and using .083" pistons. I'll be sourcing pistons from NOS or some one's crusty old shelf, does anyone have the specs for piston to wall clearance with this setup?

 

[Kube]

Clearance specifications remain the same regardless of piston diameter.
The pistons you seek are very scarce.

 

[35fordtn]

I have my machinist hone to .0025 - .003" clearance. The pistons will be hard to find but they are out there. Last time I used some I used .080" rings as the .083" rings are hard to find. I had more ring gap than I would have desired but only by a couple Thousandths

 

[Ronnieroadster]

When removing the factory thin wall sleeves I usually see one problem. The cylinder walls now uncovered are not in very good shape. Rather than looking for those .083 oversize pistons I simply bore the block for 3-3/16 pistons lost count as to how many times so far.
Ronnieroadster

 

[Kube]

When removing the factory thin wall sleeves I usually see one problem. The cylinder walls now uncovered are not in very good shape. Rather than looking for those .083 oversize pistons I simply bore the block for 3-3/16 pistons lost count as to how many times so far.
Ronnieroadster

Yes sir. I could not agree with you more.
In all my years I have done but one by simply pulling the sleeves. All the others were bored.

 

[v8fordman]

I believe I have a complete kit if you go that route. Pistons and rings. .083 over. Actually, if I’m not mistaken, the dimensions were .0835 if that makes a difference to you. Email me at v8fordman@hotmail.com

 

[Eodcoduto]

I’ve found a few kits so far and haven’t made up my mind yet on which direction to go. I knocked the liners out yesterday and the bores are nice and not pitted but I still need to mic them to see where they stand.

 

[Bored&Stroked]

I'm with Ronnie and others --> If you want to have the bores finished as they should be, you pretty much need to bore it, hone it and ensure everything is done correctly. Buying STD 3 3/16 pistons and rings is what I would do - no question is my mind!

 

[alanwoodieman]

be sure to taper the top of the block after removing liners, so you do not have trouble installing new piston/rings. I do this a lot also

 

[Eodcoduto]

Good call, machine shops around me are extinct so the search is on for one within driving distance that has a good reputation with old iron.

 

[big deuce]

I got a set of those from fordbarn member Chuck Kuntz. Don't know if he has any more...
The bores were outstanding when I removed the sleeves, and didn't want to pay extra setup to bore the block with studs still in. Egge has rings in .080 over. I machined a slug with an offset that catches the edge of the sleeve, and drove out with BFH.

 

[petehoovie]

I got a set of those from fordbarn member Chuck Kuntz. Don't know if he has any more...
The bores were outstanding when I removed the sleeves, and didn't want to pay extra setup to bore the block with studs still in. Egge has rings in .080 over. I machined a slug with an offset that catches the edge of the sleeve, and drove out with BFH.

 

[leon bee]

^^^ Nice photos.

 

[Eodcoduto]

That’s much better than the aluminum wedge I used to collapse mine and knock out. If I go back with liners, I’ll turn up a manual to keep them from collapsing . It looks like boring out to stock 239 dimensions would be the easiest to find pistons, if I found a cheap set of .083 over slugs and liners that would save on machine work, but I think it’s all going to be about the same in the end.

 

[big deuce]

If you found .083 over pistons, no need for liners. Check with Chuck Kuntz.