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Discussion Starter #1
I have a 1969 GT convertible. I have the invoice
for the car. The invoice says I have 351 cid 4v
8 cyl. The casting number on block is 1969 351
Fairlane, c90t 6015 b 3. This number was behind
the starter. Would this be consider stock motor?
It is same year but different cars mustang to
fairlane.
 

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Mod/Vintage Mustang Member
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239 Posts
How long have you owned the car?

Odds are the motor was swapped at some point. But, you never know. They may have been running short on engine blocks one day.
 

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Mustang Member
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Not an expert but when I had my 69 Cougar convertible it had a 351W-4v. All the numbers were same as a Mustang.

The numbers probably mean that it was the Mustang design group which submitted that P/N. Fairlane and Mustangs are similar so wouldnt require alot of new parts.
 

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These are numbers for a block that may be used on different platforms.A Mustang may use a block with the same casting number as a Fairlane.Have a look at the back of the block just above where the bellhousing is bolted.You may need to clean a bit and use a mirror.Sometimes but not always they stamped the VIN on there.It may be hard to spot as it was stamped by the ass plant with those little tools that are hit with a hammer then there is prob paint on top of that.It will only have the car number and plant code such as F 107986 .Hope you find a number and it matches.There a other ways to see if the block was assembled around the time the car was assembled but usally this can only tell you if the block is not from the car and if the dates match doesn't prove beyond doubt that the block is orig but probably is.If you find the VIN on it then it is a matching block.Hope this is a help.
 
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Discussion Starter #5
The "C90~" block casting numbers are for the 1969 - 1970 351-W engines.

The "6015" is just the basic casting number for that series of engines, and the "b 3" is just a suffix..
 

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Vintage Mustang Member
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I was just reading about this today. Yes it most likely is the origianl engine. The engines were used throighout Fords family of cars. They origially probably made it for a Fairlane but revised it. Hnce the B at the end of number which means it is the first revision an A would mean origianl cast. Check out the book about builing and rebuiling small block Ford engines (The cover is green).
 
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