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Author Topic:   Number on back of Piston
69stanger
Journeyman

Posts: 49
From: Northridge, CA
Registered: Aug 2002

posted 10-15-2002 10:01 PM     Click Here to See the Profile for 69stanger     Edit/Delete Message   Reply w/Quote
hey guys-

I was changing my oil pan today and when I removed it I got a great view of pistons, crank, wtc.

On the back of the piston was the nubmer "255-98", does anyone know what this number means. I want to change my heads and cam in a couple weeks and would like to know what kind of pistons I have to see if their compatiable with what I want.

thanks in advacne-

Al

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1969 Mach 1- 351 Windsor

edelbrock performer intake, 670cfm Holley Street Avenger, Headers

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Moneymaker
Administrator

Posts: 18704
From: Lyons, IL, USA
Registered: May 99

posted 10-15-2002 11:12 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
255 is the blank number and 98 is the year it was cast/forged.

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Alex Denysenko
Co-Administrator and Moderator

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[This message has been edited by Moneymaker (edited 10-15-2002).]

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69stanger
Journeyman

Posts: 49
From: Northridge, CA
Registered: Aug 2002

posted 10-16-2002 12:01 AM     Click Here to See the Profile for 69stanger     Edit/Delete Message   Reply w/Quote
thanks for the quick response, I'm relieved to know that the pistons are a couple years old, but what is blank number

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Just Strokin
Gearhead

Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 10-16-2002 07:11 AM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
Blank is a term used for an unmachined item. The number is used to trace possible problems with metalurgy or machining as the part goes from a raw state to a finished item. The number is usually placed on the item where machining will not remove it and loose the traceability.

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69stanger
Journeyman

Posts: 49
From: Northridge, CA
Registered: Aug 2002

posted 10-16-2002 09:21 AM     Click Here to See the Profile for 69stanger     Edit/Delete Message   Reply w/Quote
cool thanks

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