I am looking at a 65 fastback K code and have some concerns. the vehicle VIN is 5F09K749605. I am having a difficult time determining if the block is original and is a K code block. Does anyone know of this car b the VIN or any history. I did see that it went thru Mecum, but nothing since then. I just don't know if any registrys exist on early K code cars. any help would be appreciated.
The VIN you referenced does not appear in either the "Mustang Production Guide, Vol 1" or "The 289 High Performance Mustang", but the VIN does give an important clue about the block. The VINs of Mustangs built around you were scheduled to be built in early June, 1965. The common date was 07T, a Monday. You should verify this from the door data tag. From that date code you can determine is an engine NOT the original quickly. If the date code on the block is AFTER that scheduled date, it's probable not original. If that date code is more than three months prior, the same, probably not original. See the attachments. That date code "reads" 5H23Z - Year (a single number, 5 = 1965), Month (a single letter, H = August), the day of that month (one or two numbers) and a single letter, the inspector's code (or assembler's code). Yours should read 5SddI (or close to that like 5S11B). (The letter "S" indicated May, the letter "R" is April.) That's the easy one.
The actual VIN MUST be stamped on the engine block on the right hand front side, above the oil pan, below where the battery ground cable is attached. It is hand stamped into the block so the letters and numbers may not line up.
Let us know.
Jim
