What year is my 6.9?
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Freshman User
Joined: Sep 2008
Posts: 27
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From: Corvallis OR
What year is my 6.9?
Gentlemen, I own an 85 F 250 6.9 4x4. When I picked it up about 4 years ago the truck itself looked pretty well used, to say the least
, however –the engine itself looked pretty clean and appeared as though it had been rebuilt and painted up at some point. The guy I bought it from had only owned it for about 2 years and had never asked the previous owner whether or not it had. It occurred to me today for no apparent reason that maybe someone had just swapped in a different engine all together.. so, are there any particular indicators, numbers, etc. that would indicate whether or not it is an 85, 86, or 87 block/engine?? Just curious..
Mr. Zook
, however –the engine itself looked pretty clean and appeared as though it had been rebuilt and painted up at some point. The guy I bought it from had only owned it for about 2 years and had never asked the previous owner whether or not it had. It occurred to me today for no apparent reason that maybe someone had just swapped in a different engine all together.. so, are there any particular indicators, numbers, etc. that would indicate whether or not it is an 85, 86, or 87 block/engine?? Just curious.. Mr. Zook
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 16
From: Nutter Fort, WV
6.9 blocks up to serial #u2u17900 had a thinner casting around the block heater. It is very common for these blocks to crack.
6.9L Old Style Block
Block Casting Number:
On left side of block (beneath oil cooler) 1805440C1
Note: Some 440 blocks are truly new style and must be visually inspected by raised donut around the block heater, frost plug (right rear). Old style below serial number 173828.
Visual Identification: *No counter bored area for block heater
*No defined area on side of block for dip stick
*Thickness of cast iron around block heater 3/8" (.375")
Head Bolts: *7/16, 12 point socket is used to torque head bolts
*Block tapped with 7/16-14 for head bolts
6.9L New Style Block
Block Casting Number: 1807996C1 Note: Some new style blocks have casting
number 440. Above serial number 173828.
Visual Identification: *Has counterbored area for block heater
*Very defined relief area cast in side of block for dip stick tube.
*Thickness of cast iron around block heater 15/32" (.470")
*Latest style (not all new style 6.9) has ribs around head bolts, rear two on left side go from head gasket surface to pan rail - same as 7.3
Head Bolts: *Same as old style 6.9
6.9L Old Style Block
Block Casting Number:
On left side of block (beneath oil cooler) 1805440C1
Note: Some 440 blocks are truly new style and must be visually inspected by raised donut around the block heater, frost plug (right rear). Old style below serial number 173828.
Visual Identification: *No counter bored area for block heater
*No defined area on side of block for dip stick
*Thickness of cast iron around block heater 3/8" (.375")
Head Bolts: *7/16, 12 point socket is used to torque head bolts
*Block tapped with 7/16-14 for head bolts
6.9L New Style Block
Block Casting Number: 1807996C1 Note: Some new style blocks have casting
number 440. Above serial number 173828.
Visual Identification: *Has counterbored area for block heater
*Very defined relief area cast in side of block for dip stick tube.
*Thickness of cast iron around block heater 15/32" (.470")
*Latest style (not all new style 6.9) has ribs around head bolts, rear two on left side go from head gasket surface to pan rail - same as 7.3
Head Bolts: *Same as old style 6.9
