Piston size

Divco one

Divco one

Senior Member
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.
 
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.
 
If you do not have some micrometers then take it to a machine shop. If none close, try a auto repair shop.
 
You can pick up a decent caliper at Harbor Freight for about $10 that can measure the cylinder bore or piston diameter.
 
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.
 
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.
 
A local machine shop can measure all your pertinent clearances and check for cracks before shipping your engine to a rebuilder.
 
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.
 
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