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Author
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Topic: Number on back of Piston
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69stanger
Journeyman Posts: 49
From: Northridge, CA
Registered: Aug 2002
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posted 10-15-2002 10:01 PM
  
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 ------------------
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
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posted 10-15-2002 11:12 PM
255 is the blank number and 98 is the year it was cast/forged.  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!" [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
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posted 10-16-2002 12:01 AM
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
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posted 10-16-2002 07:11 AM
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
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posted 10-16-2002 09:21 AM
cool thanks
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