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#76000 04/07/2007 12:48 AM | Joined: Nov 2006 Posts: 8 Junior Member | | Junior Member Joined: Nov 2006 Posts: 8 | Hi Can anyone out there tell me what year my 270 GMC is? The ser. # is 270978175. I've got it in a 41 Gimmy with electronic ignition cast iron headers and a 4 blr. carb also its baallanced. Now if I can just keep the water out of the oil. Oh well that is another story. Thanks | | |
#76001 04/07/2007 2:18 AM | Joined: Oct 2003 Posts: 5,152 Cruising in the Passing Lane | | Cruising in the Passing Lane Joined: Oct 2003 Posts: 5,152 | Other than confirming it looks like a 270 serial number I can't help you much with that.
Have you tried the casting numbers on inliners.org?
1955 1st GMC Suburban | 1954 GMC 250 trailer puller project | 1954 GMC 250 Hydra-Matic | 1954 Chevy 3100 . 1947 Chevy COE | and more...
It's true. I really don't do anything but browse the Internet looking for trouble... | | |
#76002 04/07/2007 2:58 PM | Joined: Dec 2005 Posts: 2,557 'Bolter | | 'Bolter Joined: Dec 2005 Posts: 2,557 | I believe there should only be seven digits ,i may be wrong.
1951 3100 Chevrolet1951 Chevrolet Suburban CarryallImage"A house is built with boards and beams. A home is built with love and dreams." "Look deep before you leap !!!" / "Everything is Everything" "If I say a mouse can pull a house, hitch him up"
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#76003 04/07/2007 7:05 PM | Joined: May 2001 Posts: 7,438 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,438 | This info is taken from a post on oldgmctrucks.com forums.
Somewhere on the block casting there will be what looks like a tag attached with slot head screws. This is actually cast into the block. (The actual tag was screwed into the wooden mold the block was cast from.) This will have a letter and some numbers.
The first digit is always a letter of the alphabet A-L. A=January,
B=February, C=March etc, etc all the way to L=December.
The next digit is a number 1-31 which is the day of the month.
The last digit is always a single number and represents the year of the casting.
Example: if the last digit is a 2, this could mean 1942, 1952 or 1962. To determine which you need the casting number and the Inliners International casting number chart.
According to that chart, casting number 2135412 was used on 270's from '46-54. Casting numbers 2324003 and 2404929 were used from '55-63.
Using that data you should be able to date your 270. However there were military 270s prior to '46 that Inliners doesn't list a casting number for. If your casting number is different from one of the above you may have one of these. The little tag code should still apply to it though. | | |
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