1966 VIN# decode Information
TRANS code G: MX Cruise-O-Matic.
172 net HP @ 4,000 RPM = 352 2V
DSO 71: Los Angeles (SoCal) Ford District Sales Office, where the original selling dealer ordered the truck from.
Based on the HP & RPM, the A/T has to be the MX, the only A/T offered in 1965/67 F100/350's w/352's.

Since we're all using the same source, take a look-see here: 1964/72 Ford Truck Parts Catalog / Section A70 / A/T Application Charts / Page 5.
As you can see from this chart, the C4 was used in 1965/66 F100/250's with 240 I-6's.
And...that the MX Cruise-O-Matic was also used in 1965/66 F350's w/240/300 I-6's.
And...if you look on page 4, you'll also see C/M for 223/292's, but this is not the MX C-O-M, it's the FX C-O-M.
The FX was the "small" Cruise-O, while the MX was the "big" Cruise-O. Y'all (I don't) have to look in the C/M parts list of A70.2 to tell one from another.
And btw: The Los Angeles (SoCal) Ford District Sales Office is actually located in....Anaheim!
This sales office also takes dealer orders from the Hawaiian Islands and Guam.
So, there is a clue. What 1965/66 F100/350 engine would have 172 net HP @ 4,000 RPM?
352 2V .. and since the trans code is G = MX Cruise-O.
Here are some pics if they will help:
EngineTop2.jpg picture by Backyardrestorer - Photobucket

As you probably already know, many parts (cylinder heads, intakes, etc.) within the FE engine family can be swapped around between the different sized engines. Since casting numbers were not changed every year, it was common to have, for instance, a C8- (1968) cast part in a 1970's FE engine. This fact is just one reason why it is tough to determine a particular engine's displacement from only outward observations. With all that said, I would suggest the following two ways to narrow down the possible displacement of any FE engine.
(1) Remove a sparkplug and with a straw, wire or similar item inserted into the sparkplug hole, measure the stroke length while you cycle/turn over the crank by hand. Repeat this to get confirming measurements. Then compare the stroke length to known stroke lengths within the FE engine family.
(2) The next indicator of displacement would be to drain any residual motor oil from the oil pan then roll the engine over and remove the pan. Then spin the crank and look for any casting #/code that is cast into it. The crank casting # is less definitive than the stroke length, but sometimes between the two data points (stroke length & crankshaft casting #) you may be able to pin-point the displacement. Of course, neither data point will indicate whether or not the engine has been over-bored during its lifetime.
If you decide to perform these two "tests", please let us know what you determine. Good Luck!
BarnieTrk
I'd guess you'll find one of these crankshaft casting numbers:
2U - '66-'73 390
C3AE-D - '63-'71 390, 406, 427
C5AE-B - '65 352
C6AE-A - '65 390
and if its C9AE-A,,,,,, I'm interested in purchasing it!

BarnieTrk
Ford Trucks for Ford Truck Enthusiasts
Casting numbers are foundry marks, cannot be cross referenced to Ford part numbers.
FE CRANKSHAFT CASTING NUMBERS
<TABLE style="WIDTH: 98%; BORDER-COLLAPSE: collapse" borderColor=#000000 cellSpacing=0 cellPadding=2 border=1><TBODY><TR><TD bgColor=#fae9d1>C9AE-A</TD><TD>'69 427 c.i.d.</TD><TD>High Performance, Steel, NASCAR Specification</TD></TR></TBODY></TABLE>
I read about it here: Ford FE Crankshaft Casting Numbers - FORDification.com
BarnieTrk
(Vin# F10YN816460)
(F10=61-66 2wheel drive)
(Y=Year66-C.I.D. 352-Carb 2v-H.P. 208-R.P.M.
4400)
(N=Norfolk Va)
and the rest im not sure what it means.
In addition
My color is W=Medium Blue
Body is 281=

Trans C=

Still trying to figure out what size engine i have i was told it was a 390 but my source was not a reliable one how can i tell? And are there any free downloadable shop manuals on my truck?
I replaced the starter solenoid and valve cover gaskets recently and the parts where ordered for a 5.8L 352engine could that be my engine or did those parts fit multiple engines?
I have alot of questions any help would be greatly appreciated.
VIN: F10YN816460 // W.B. 129 / Color: W / Model: F100 / Body: 281 / Trans: C / Axle: 17 / GVW: 05000 / Cert. net HP: 172 / RPM: 4000 / DSO: 25
Still trying to figure out what size engine I have, I was told it was a 390.
390's were not available until 1968. 352/360/390 FE engines look identical.
I replaced the starter solenoid and valve cover gaskets recently and the parts where ordered for a 352 engine could that be my engine or did those parts fit multiple engines?
Same parts: 1965/67 F100/350 352, 1968/76 F100/350 360/390.
F10 = F100 2WD
Y = 352 2V
N = Norfolk VA Assembly Plant.
816460 = 1966, assembled February 1966.
129" Wheelbase
W: Marlin aka Medium Blue.
Model: F100 2WD, 5,000 lbs. GVWR
Body 281: 2 = Medium Blue Crush Vinyl & Medium Blue Wicker Pattern Vinyl / 81 = 81A Standard Cab.
Trans C: Ford type 3.03 3 Speed Manual all Syncromesh Transmission.
Axle 17: Ford 9" Rear Axle / 3.25-1 / non Limited Slip / 3,300 lb. Rear Axle Capacity.
5,000 lbs. Gross Vehicle Weight Rating.
172 net HP @ 4,000 RPM
DSO 25: Richmond VA Ford District Sales Office, where the original selling dealer ordered the truck from.
That is everything on the Warranty Plate.
I would like to find out what Engine i have in it. I pulled some casting numbers from the top in front of the carb, 6A19 C5AE9425B, those where all i could find other than the firing order on top behind the carb.
I currently work as a mechanic at a Ford Dealership but do not have access to the parts department's "knowledge" if you will.




