8BA pistons have 825 stamped on them.
 

The pistons in my 8ba are stamped with 825. The motor has a rebuild tag from Southern Automotive Engines inc, Owensboro Kentucky, so anyone have any information on these pistons and what size they are?

Re: 8BA pistons have 825 stamped on them.
 

8BA has sleeves?? New to me.
Measure the pistons.

Re: 8BA pistons have 825 stamped on them.
 

Re: 8BA pistons have 825 stamped on them.
 

Sounds like some one removed the sleeves. measure the bore.

Re: 8BA pistons have 825 stamped on them.
 

Yep! first poster removed his reference to being sleeved:confused:

Re: 8BA pistons have 825 stamped on them.
 

Don't think 8BA's ever had factory thin wall sleeves. But the .0825" over pistons used when sleeves were removed were a common size. Very simple for the rebuilder to rebore a worn 8BA to that size and use those pistons. No sleeves need be involved!

Re: 8BA pistons have 825 stamped on them.
 

Measure the piston skirt 90 deg from the pin and tell us what u get.This isn't rocket science.

R

Re: 8BA pistons have 825 stamped on them.
 

Hey John. New project?

A set of .0825 was on ebay recently... They existed. Just an oddball piston size for when people removed sleeves in earlier engines.

http://www.ebay.ie/itm/FEDERAL-MOGUL...-/371014291232

Re: 8BA pistons have 825 stamped on them.
 

This guy found something similar in his earlier engine

http://fordbarn.com/forum/showthread.php?t=9601

Re: 8BA pistons have 825 stamped on them.
 

Sleeved engines were 221 cu ins. The finished bore was 3.0625"
Sleeve was .040" wall thickness,requiring a hole 3.142" for sleeve.
That hole was honed to 3.145" that ended up a 3.0625"+.0825"=3.145"
That is smaller than a stock 8ba bore.Can't be the combination op has.

R

Re: 8BA pistons have 825 stamped on them.
 

Good point, I thought it was an early block

Re: 8BA pistons have 825 stamped on them.
 

The early mercury 40/41 used the steel sleeves also and it was 3 3/16"
Same bore as an 8BA.
Bill

Re: 8BA pistons have 825 stamped on them.
 

That is why I asked for piston measurement.

R

Re: 8BA pistons have 825 stamped on them.
 

The Ford 9N, 2N and 8N tractor engines were basically 1/2 of a 239 V8 with the 3 3/16" bore and thin wall sleeves and same pistons as the V8. Removing sleeves and installing .0825" over pistons was common practice.