I just bought engine from Fire Chief's Q-code '66 Thunderbird and it's FE 428 but is it standard 428 or Police Interceptor?

It has reinforced webbing.
Rear of the block has the three oil gallery plugs above the rear cam plug and cast number 66-427 and number 2.
Side of the block has DIF 36
Inside of the block has number 23

Under the block has date number DI6 and EI

Crankshaft IU and V (upside down) 0T 03
Main bearing cabs 1 C2AE
Connecting rod 11/32 bolts
Rod cabs 1C C3AE CF40 and other has C6AE
Oil pump 22OB 57HV
Hydraulic lifters
Aftermarket aluminum intake manifold Streetmaster 390
Heads C8AE-H
Exhaust manifold C6AE 9430
Waterpump C8AE 8505H

I did't find any other numbers.

So what I have?

 

Hard to say since it's not an original engine and has been rebuild using mixed parts.
11/32 bolts are CJ-PI style but I've never seen C3AE and C6AE rods mixed in a engine, no factory engine ever came with a 57HV high volume oil pump. Heads are non CJ-PI.

 

If block is not from T-bird so where did it came from?

 

Here is more info about car. The car has been at some point in Leesburg. FLA

Vin is 6Y87Q131447
Body 63D
Color T
Trim 25
Date 21M
D.S.O 22
Axel 1
Trans 4

Code on the right fender on top of the shock absorber
R
12 8 3

Engine tag
428 66 1
5M 410 S

 

I have a nephew with a 390 that has 66-427 cast into the block, yours could be the original block for the car or maybe not.
Not sure about the C2AE main caps
11/32 rod bolts are correct for 428 CJ and PI but a original engine will have all rods with the same casting numbers.
C8AE-H heads are a common FE head that was first cast in 1968, your car is a 66 so heads are differently not the originals.
57HV is a Mellings aftermarket high volume oil pump, also not an original part.

Most likely something happened to the original engine and it was ether rebuilt using different heads and other parts or it was replaced with a remanufactured engine.

 

I did't see the number of connecting rods and some of the cabs numbers were unclear so everyone could be C3AE.

 

Towards the end of FE production, casting forms were well worn. FORD didn't want to retool as a newer generation(s) of engines were coming. So the molds became mixed and in some cases a passenger car/light truck application would receive a 391FT bare block for assembly.

Your engine has been into so there is no telling what took place. It would have to be laid out on the bench and a FE FORENSICS SPECIALIST examine it.

-428PI DISCUSSION-

 

I think there is more information and knowledge of FE engines here than in Finland where the car and engine is today.

 

Underneath dirt revealed "C" scratch on the rear bulkhead. There is also a brass plate with the numbers 19968 on the front of the engine.
So it's '66 428 Police Interceptor?

 

The plate is almost 100% sure to be a rebuilder's serial #. Not stock Ford.

And 19,968 engines means that rebuilder did a LOT of engines. Places like Jasper come to mind.

 

If the 428 is the original, it's not a Police Interceptor. The C8AE heads were not used in 1966. The casting date code you posted makes no sense.

In 1975, I bought an almost identical '66 T-B Town Landau, excepting the seats were black crinkle vinyl and it was ordered from DSO 71 Los Angeles.

Salesman came up to the back counter, said I have a customer with a '66 T-B, he's planning to trade it in (on a new Granada) wants 800 bucks, we (dealer) only offered 600 bucks.

Salesman said, I know you like old cars, would you be interested? I went out and looked at it, it was a mint all original car, the only thing wrong was the headliner was sagging.

I said SOLD! Opened my wallet, handed the owner 800 bucks.

 

I think he's saying a 428 PI was installed in the car.

 

Info decoded based on 1966 Thunderchicken data in post #4.

The heads are not original to the 1966 time frame, but what about the block? What is the date code? The date code the OP posted makes no sense.

What is the block casting number (it will not decode to the engine size)?

Where is FTE member baddad457 when we need him?

 

Does't the important information tell that the engine is a police interceptor? Reinforced webs, "C" scratch, crankshaft, connection rods.

https://www.428cobrajet.org/id-block

 

It could be more of a CJ then anything, and the heads are wrong for a CJ.

I want to see a picture of the "C" scratch