[align=left]How do I determan if the numbers are matching? This is the information I have gather so far:

Block Number: C6AE-6015-C
-6C3-
4 (this was cast under the date of prduction and was by its self on the side of the block)
"In mid-year 1966 the Windsor plant also began producing 289s. The casting numbers for these were (C6AE-6015-C with a "289" and "WF" in the lifter valley." (found this off of some informational site, from the FAQ section)

C: 1960's
6: year of decade (1966)
A: Car line - Galaxie
E: Engineering Department - Engine

6015: Basic part number

C: Design Change

6: Year \
C: Month> March 3rd 1966
3: Day /




VIN: 6R07C220611
65H 8 D6 21F 75 6 6

Warranty Number: 6R07C220611
Year: 6 1966
Plant: R San Jose, CA
Body Series:07 2 Door Hardtop
Engine: C 289 2v V8
Unit: 220611 220611


Miscellaneous Vehicle Data
Body: 65A 2 Door Hardtop, Standard Interior
Color: 8 Springtime Yellow
Trim: D6 Parchment Crinkle and Rosette Vinyl with Black, Standard Interior
Date: 21F June 21, 1966
D.S.O: 75 Phoenix
Axle: 6 2.80:1, Conventional
Trans: 6 C4 Automatic

I have been through the FAQ section and searched Google and I haven't been able to find anything to tell me how I determan from what I have if it is the original block (I dont think it is since its an A: Galaxie) but the fact that it was made in march and my car was made in June is kinda close so I dono...Am I missing somthing or is it not an original block?
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if im not wrong only 1968 mustangs and later can be "numbers matching"

 

The term numbers matching means that the VIN is stamped on the engine block, transmission and rear end. You will not have a numbers matching 66 Mustang. And, you will never know if that engine is the original from the factory. Forget about all the numbers that you can't prove, and just drive and enjoy your ride.

 

This is certainly a well worn thread. But, it is useful to discuss why I would consider this numbers matching for this car. Given the engine build date 3 march, 1966, and the data plate 21 June 1966 makes sense as "numbers matching". The engine was built before the car itself (3.5months). It is not too old (a 65 engine), or too late a (July 66 engine). It is a bit early, but who knows when the block sat around at the fcatory, whether there was a transit issue etc. Perhaps there is a judge out tere that could shed light on this??

 

exactly. If you want matching numbers on a 66 coupe, then buy a Vette.

 

Alright I guess now it doesn't matter... thanks guys

 

We don't have an MCA judge on this forum. Again, the term numbers matching means that the block, transmission and rear end had to have the VIN of the car stamped onto those three things.
Now, given the fact that the engine was built some time before the car was assembled at the plant could lead you to believe that it is the original engine block, but you can't prove it, and neither can Kevin Marti.

 

Glen is right, you cant prove it.
And having trod this path myself just trying to find out what my car started life as, i understand its frustrating.

if its any consolation, IMO its likely to be the original block. And be thankful that its a 289.
302's are like @ssholes...every ones got one.

 

When Ford cast an engine, itwas marked with the casting number and date code. The block was set aside toage, normally 3 to 5 months. It took a day to machine the block and assemble for use in the car assembly line. Your date code is reasonable for your car. The earliest casting made for an early Mustang was for the Boss 302 in 1969. Up until then, Mustangs 'borrowed' engines from full size Fords (the 'A'), Falcons (the 'D') and Fairlanes (the 'O'). Mercury's used Ford engines so you could get a block from a Comet and it would be usable in a Mustang.
Jim

 

atleast you got all the info so you can restore it back to the way it was or go nuts with it