Ok, I've heard that a very few '66 mustangs came with a c6, but when u decode the vin, it shows a c4. I know this because for a while, I thought I had one. So I did some, well, a friend did some research, and found this out. If u go under your car, and look at the oil pan, u can tell. A c4 has a square pan, but a c6 has a little arm come off, I think it's the front part.
It will look like this:
______
| | ^
| | |
| | Front
----------
^
|
C4
___
| |
____| | ^
| | |
| | Front
| |
------------
^
|
C6
Or at least something like that-lol
Does anyone like my art?

__________________
'98 Mustang Cobra Black/Black, Maganapacks, C&L, MGW shifter, K&N, Eibach springs, BBK caster/camber plates, KYB/AGX shocks, Real Y2K Cobra R wheels with Perrii P-Zero tires.
'89 Bronco, rebuilt 351, and C6.
My website!
West Coast Domestics