The Ford Barn

Divco one · 09-01-2016, 02:51 PM

Can a piston with no markings on top except for the scrip ford be assumed to be standard. I don't have any way of measuring it.

colin1928 · 09-01-2016, 04:18 PM

Short answer NO you must measure

J Franklin · 09-01-2016, 05:14 PM

More than likely it will be standard. Oversize should be marked but it is always best to check. I have found NOS items unused because they were rejects that made it out of the scrap bin.

Ed H. · 09-01-2016, 06:01 PM

If you do not have some micrometers then take it to a machine shop. If none close, try a auto repair shop.

Tom Wesenberg · 09-01-2016, 06:13 PM

You can pick up a decent caliper at Harbor Freight for about $10 that can measure the cylinder bore or piston diameter.

ian Simpson · 09-01-2016, 08:42 PM

Sponsored Links (Register now to hide all advertisements)

Remember- size matters

Jim Brierley · 09-02-2016, 10:38 AM

If you have a block that you are going to put them in, slip them in along with feeler gauges and you will know. Clearance at the bottom of the skirt is what you are interested in, at 90 degrees from the pin.

Divco one · 09-02-2016, 01:07 PM

I have a spare engine that I was going to ship out and have rebuilt. I didn't want to ship it if it's been bored to its limit.

J Franklin · 09-02-2016, 04:17 PM

A local machine shop can measure all your pertinent clearances and check for cracks before shipping your engine to a rebuilder.

Tom Wesenberg · 09-02-2016, 08:09 PM

Most people consider .125" overbore the limit, so even a ruler can measure that amount.

Even when bored to the limit, it can be sleeved back to stock size.

09-01-2016, 02:51 PM	#1
Divco one Senior Member Join Date: Jul 2013 Location: Johnstown, PA. Posts: 137	Piston size Can a piston with no markings on top except for the scrip ford be assumed to be standard. I don't have any way of measuring it.

09-01-2016, 04:18 PM	#2
colin1928 Senior Member Join Date: Mar 2013 Location: Australa Melbourne Posts: 878	Re: Piston size Short answer NO you must measure

09-01-2016, 05:14 PM	#3
J Franklin Senior Member Join Date: May 2010 Location: Oregon Posts: 5,959	Re: Piston size More than likely it will be standard. Oversize should be marked but it is always best to check. I have found NOS items unused because they were rejects that made it out of the scrap bin.

09-01-2016, 06:01 PM	#4
Ed H. Senior Member Join Date: Jun 2013 Location: Milton NH Posts: 148	Re: Piston size If you do not have some micrometers then take it to a machine shop. If none close, try a auto repair shop. __________________ If you see a bomb technician running, do everything in your power to keep up with him. United States Navy

09-01-2016, 06:13 PM	#5
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Piston size You can pick up a decent caliper at Harbor Freight for about $10 that can measure the cylinder bore or piston diameter.

09-01-2016, 08:42 PM	#6
ian Simpson Senior Member Join Date: Apr 2014 Posts: 709	Re: Piston size Sponsored Links (Register now to hide all advertisements) Remember- size matters

09-02-2016, 10:38 AM	#7
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,085	Re: Piston size If you have a block that you are going to put them in, slip them in along with feeler gauges and you will know. Clearance at the bottom of the skirt is what you are interested in, at 90 degrees from the pin.

09-02-2016, 01:07 PM	#8
Divco one Senior Member Join Date: Jul 2013 Location: Johnstown, PA. Posts: 137	Re: Piston size I have a spare engine that I was going to ship out and have rebuilt. I didn't want to ship it if it's been bored to its limit.

09-02-2016, 04:17 PM	#9
J Franklin Senior Member Join Date: May 2010 Location: Oregon Posts: 5,959	Re: Piston size A local machine shop can measure all your pertinent clearances and check for cracks before shipping your engine to a rebuilder.

09-02-2016, 08:09 PM	#10
Tom Wesenberg Senior Member Join Date: May 2010 Location: Mpls, MN Posts: 27,582	Re: Piston size Most people consider .125" overbore the limit, so even a ruler can measure that amount. Even when bored to the limit, it can be sleeved back to stock size.