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jerryinid

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I am in the process of tearing down a donner 392 for my loadstar. The serial # on the engine is 1329881 e and the casting # on the block is 7 26 x, which I belive is 1974. Apparently this was a very good engine till I left the truck outside in the snow without a hood. So I have the engine on a engine stand and am trying to remove the pistons. Because of my stupity I have my work cutout for me. My question is, on top of the pistion I expected to see some indication of bore, std, .030, .060 but instead there is this number, 357147 c2,which I am assuming is a int'l p/n but for which piston. There is no ridge on the cyl walls which in itself is amazing, the bearings are/look great. Now it is just a matter of letting pb blaster and some carefully directed pounding to get the pistons out and free up the engine. Thanks for your help

jerry
 
I think you are not seeing/reading that piston part number correctly.

The ihc p/n for a standard bore 392 is 337144c21.

.010" over is 337145c21
.020" over is 337146c21
.030" over is 337147c21
.040" over is 337148c21

the standard bore piston will not be marked with any oversize designation.

The oversize pistons will have the part number in addition to the typical oversize dimensions.
 
Well, as usual, you are right about not reading the number correctly. It is actually 337144-c2. This is what happens with old age and bad light. Actually the light is the same as it was eleven years ago, now it is not enough. Thanks for your help.
Jerry
 
I have the same kinda problem with the eyeballz! I got all kinds of aids I havta use to read this stuff, especially on carbs!

However, in comparison to many other oem manufacturers, ihc did an excellent job of forcing both their supply partners and their own internal manufacturing units to place permanent part identification information on even the smallest of components. In my former occupation we lived and died by that type of information for identifying parts correctly which is critical in any manufacturing process.

When dealing with numbers such as you see on the pistons, it's always possible that stuff was lightly stamped or false-stamped, or even double-stamped. Sometimes the numbers are part of a casting mold that had portions of the sand that crumbled leaving only a partial number. Ya just gotta take the number ya have even if partial, then compare with the various parts lists and use common sense to determine that some kind of error exists, but use the info ya have to figgr it out!

Regarding remanufactured parts I.d., because abrasive blasting is normally the cheapest way to "clean" cores, the oem I.d. Numbers end up being obliterated or rendered unreadable.
 
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