What is this piston?

[SchoolBoy]

I just opened up my svo motor looking for a rod knock, and wanted to know what pistons I have in the motor. The number stamped on the bottem of the piston is..... E3ZE-6110-C4A These are a dished piston. But are they standard size bore or over sized?

Also the block has this number stamped on it.... EF248875 and it does not match my vin number....

We found #3 rod bearing to be worn to the brown babbet on the upper half shell, and it was a tapered wear pattern from one side to the other.

[Pat_in_L.A.]

"A" should be standard.

[Pat_in_L.A.]

Look at the numbers stamped on the domes.

[SchoolBoy]

Thankyou guys! At this point were still tearing it down, but looks like a full rebuild with new pistons may be in order. Glad I sent my dues in a few weeks ago...

[8T6 SVO]

Also the block has this number stamped on it.... EF248875 and it does not match my vin number....

It least the replacement engine was out of a SVO - A 1984 model as well!

I sent Pat some standard pistons new in the box a while back - I'm sure he still has the box with the #A after the part #, which means standard bore. I think #B was .10 over, #C was .20 over, etc. Whatever the difference is, I know it's printed on the box.

There was also four colors which expressed different sizes of the standard piston to the .0001's if I remember correctly.

[Pat_in_L.A.]

On an engine with all original pistons, there are "select fit" stamped numbers on the domes that correspond to the cylinder bore numbers stamped on the block near the machined flat where the distributor mounts.

[8T6 SVO]

Is that because they couldn't machine all four holes the same size?

I've got a block out here that reads "4444". And I thought it meant it was for a 4-wheel drive, 4-cylinder, 4-speed, 4-door thingie. Silly me.

That's it - 4444 coresponded to each of the 4 cylinder sizes to the .0001's and there was 4 different pistons in the standard size to approximate the closest size that you could aquire. Such as #1 = 3.78 to 3.782.5, #2 = 3.782.5 to 3.785, #3 = 3.785 to 3.787.5, and #4 = 3.787.5 to 3,789. There was a coresponding color on the box - blue, red, yellow, purple for these 4 standard sizes. Am I correct?

[Ken Potter]

Well I've checked the VIN database and the registry and nothing has come up for _EF248875. Do Turbo GTs have a 28T VIN?

[8T6 SVO]

So a "4444" engine would make more power than say a "1111" engine purely due to the extra displacement?

I would say so Mike. Small though it might be.

[8T6 SVO]

Well I've checked the VIN database and the registry and nothing has come up for _EF248875. Do Turbo GTs have a 28T VIN?

It was my understanding that only SVO's got the vin stamped into the block.

Maybe ask Eric and see if he can help?

I know Eyelawdoc can help with the Turbo GT question.

[93-331-29psi]

Well I've checked the VIN database and the registry and nothing has come up for _EF248875. Do Turbo GTs have a 28T VIN?

No the turbo GTs/RSs have "W" engine code in the VIN

[chalkys_explorer]

I punched the EF code into the vin database with the the magic % cheat and got nothing. EF suggests 84 but I don't think it's an SVO block.

Nelson, correct me if I'm wrong but there were numbers stamped in the top of the pistons right??

As for numbers stamped in the block, it's still to dirty to see

[8T6 SVO]

ALL engines destined for the USA market get the VIN numbers (or a portion thereof) stamped or tagged in/onto the block and gearbox. That's been federal law since at least 1975.

The new cars (2001+ ??) have barcode tags on EVERYTHING (hood, fenders, block, doors, trunk, windows, ...) with VIN number.

So the replacement engine with EF248875 stamped on the side of it could be from a Mustang GT Turbo or a T-Bird, or a XR4TI, or a Cougar,etc.

[chalkys_explorer]

yep.

[SchoolBoy]

Chris I can't thank you enough for coming up to help with the beast. I can not see any number on the top of the pistons because they are still to dirty. As for the code on the block, could that be a deadicated code for reman blocks?