The Ford Barn

jetmek · 06-06-2023, 08:16 AM

Can a 3.062 bore 59a be safely taken out to 3.248 for a 265 build? Inclined to think yes provided the block castings are all the
Same

Ol' Ron · 06-06-2023, 08:49 AM

Absolutely, took several to 3.312. Not sure why Ford did this, but to be safe, have it sonic tested.
Gramps

jetmek · 06-06-2023, 08:59 AM

Thnx. Lotsa meat in the wall when did the 2 finger thickness check��

kurt v · 06-06-2023, 09:00 AM

I just had a 40 block bored to 3 3/16 (3.1875) std, with my merc crank gives me 255 cu in, did not want to chance going more with that block. I think your block could go more than the older block.

Ronnieroadster · 06-06-2023, 12:29 PM

Your definitely safe going to 3-3/16 done it many times myself exactly like Kurt wrote above. Adding a Merc crank and your at 255 cubes. Only ten less cubes than the 265 idea.
Ronnieroadster

kurt v · 06-06-2023, 02:34 PM

Sponsored Links (Register now to hide all advertisements)

My block bored after sleeves removed to 3.1875 still left a slight ridge from the sleeve lip, a little bevel at cyl edge and pistons are going in OK.

kurt

Pete · 06-06-2023, 03:58 PM

Quote:

Originally Posted by jetmek

Can a 3.062 bore 59a be safely taken out to 3.248 for a 265 build? Inclined to think yes provided the block castings are all the
Same

It is advisable to have ANY block sonic tested and magnafluxed before ANY machine work is done.
Cheaper in the long run.

Nowdays it usually takes 5 blocks before you find a good one.

Ol' Ron · 06-06-2023, 04:28 PM

At one point in my life 3 3/8 was the standard over bore, Corse they were pretty new then. Gramps

Pete · 06-06-2023, 04:41 PM

Quote:

Originally Posted by Ol' Ron

At one point in my life 3 3/8 was the standard over bore, Corse they were pretty new then. Gramps

Yup. 3 3/8 for stock rebuilds. 3 7/16 for hot rods.
Standard hot rods got 4 1/8 crank, 425 cam, 4 pots and an H&C mag.

Ol' Ron · 06-07-2023, 11:59 AM

Nice one Pete. Built several 3 7/16 X 4 engines, one is still running. I also have a 296 engine that's still running, and it has Hyperutectic pistons in it. Only set I ever saw, baught them at the Yorl flea market back in the 90's
Gramps

06-06-2023, 08:16 AM	#1
jetmek Senior Member Join Date: May 2010 Location: albany Posts: 466	Small bore 59a ? Can a 3.062 bore 59a be safely taken out to 3.248 for a 265 build? Inclined to think yes provided the block castings are all the Same __________________ engine and component overhauls my specialty! Website- www.godevilgarage.com

06-06-2023, 08:49 AM	#2
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Small bore 59a ? Absolutely, took several to 3.312. Not sure why Ford did this, but to be safe, have it sonic tested. Gramps

06-06-2023, 08:59 AM	#3
jetmek Senior Member Join Date: May 2010 Location: albany Posts: 466	Re: Small bore 59a ? Thnx. Lotsa meat in the wall when did the 2 finger thickness check�� __________________ engine and component overhauls my specialty! Website- www.godevilgarage.com

06-06-2023, 09:00 AM	#4
kurt v Senior Member Join Date: Sep 2021 Location: summerton, sc Posts: 353	Re: Small bore 59a ? I just had a 40 block bored to 3 3/16 (3.1875) std, with my merc crank gives me 255 cu in, did not want to chance going more with that block. I think your block could go more than the older block.

06-06-2023, 12:29 PM	#5
Ronnieroadster Senior Member Join Date: Dec 2010 Location: East Coast in CT Posts: 1,529	Re: Small bore 59a ? Your definitely safe going to 3-3/16 done it many times myself exactly like Kurt wrote above. Adding a Merc crank and your at 255 cubes. Only ten less cubes than the 265 idea. Ronnieroadster __________________ I use the F word a lot no not that word these words Flathead , Focus and Finish. "Life Member of the Bonneville 200 MPH Club using a Ford Flathead block" Owner , Builder, Driver of the First Ford Flathead bodied roadster to run 200 MPH Record July 13, 2018 LTA timing association 200.921 in one and a half miles burning gasoline. First ever gas burning Ford flathead powered roadster to run 200 MPH at Bonneville Salt Flats setting the record August 7th 2021 at 205.744 MPH

06-06-2023, 02:34 PM	#6
kurt v Senior Member Join Date: Sep 2021 Location: summerton, sc Posts: 353	Re: Small bore 59a ? Sponsored Links (Register now to hide all advertisements) My block bored after sleeves removed to 3.1875 still left a slight ridge from the sleeve lip, a little bevel at cyl edge and pistons are going in OK. kurt

06-06-2023, 04:28 PM	#8
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Small bore 59a ? At one point in my life 3 3/8 was the standard over bore, Corse they were pretty new then. Gramps

06-07-2023, 11:59 AM	#10
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,860	Re: Small bore 59a ? Nice one Pete. Built several 3 7/16 X 4 engines, one is still running. I also have a 296 engine that's still running, and it has Hyperutectic pistons in it. Only set I ever saw, baught them at the Yorl flea market back in the 90's Gramps