I was standing there staring at my engine today, thinking about headers, carbs, intakes, .. you guys know what I am talking about..

And I realized... This is not the engine that was stock in this car.

The door code says it was a 200 I6 (1968 Mustang Coupe), but when I look at the engine, the pullets for the Air Conditioner are there, so is the block where the compressor mounts. The Radiator has the... uh... (don't you hate that when a word escapes your mind...) round black thing above the radiator.. Darn it.. Too early in the morning I guess..

Anyway, there is no air conditioning in this car. No hoses running to the interior, the factory plate in the firewall (where the hoses go through) is still there. The Interior controls are not air conditioner controls....

So, Obviously this was not the engine that was originally in this car, and it's been swapped at some point.

A) How can I tell?
B) How can I tell what THIS motor's size is? I don't want to go buying 200 parts if this is not a 200, or something from another I6?

Thanks in advance.

 

Those holes are for the heater hoses.

To find out what engine look on the side of the block near the starter and write down the casting number. You should be able to search that number and figure out what size engine.

 

Thanks, I just did that actually right before I came back and checked the forum.

C8DE -- So it's a 200, but from a Ford Falcon of the same year.

 

The air conditioning unit is a completely separate unit that mounted up under the dash, so there would be no controls built into the dash on your car.
The falcon and the Mustang used the same motors (at least on my car) with slight differences between the two. The shop manual for mine is for the "Comet, Falcon, Fairlane and Mustang". The motor is almost identical for all and almost all the parts for it can be swapped between them all. I think one of the differences is the carburetors and transmissions used by each. Not sure on that one.
Just because one source says it was used in the falcon does not mean it was not for the Mustang as well. I'm not saying the engine has not been changed, but it may be a Mustang Engine and may be the original one at that. I would keep looking into it.
Keep that in mind when you look for parts, if a store does not list the mustang, ask them to look up the falcon part for the same year and see if that is the one you need.
Here's a link to some ford engine codes(block/head castings), it tells about the ford motor, but not the specific car it was used in.http://www.fordsixperformance.com/

 

No, it doesn't. The "D" only means the engineering was charged to the Falcon group. The engine was used in Mustang, Falcon, Fairlane, Bronco, Comet, Cupid , Donner, Blitzen…

They did not cast different blocks of otherwise identical engines based on the eventual car. Besides, many cars, such as Mustang, Cougar, Fairlane, were all built on the same assembly line, so segregating such engines would have been impossible.

 

Just looked at my engine, the block cast is C6DE. a 1966 Falcon Engine? I guess I am going to have to take closer look at my car as well... maybe had an engine swap?

 

had me questioning some parts with the online decoding guide. I have noticed a lot of parts have the "D" as the 3rd character... and I know they are for the mustang (and probably used on the falcon.)
I've done a side by side with an older falcon almost everything under the hood is identical.

 

Lots of stuff was used across different cars. The only thing the "D" means is the Falcon group was responsible. I don't think any version of the 6 cylinder engine ever had a "Z". In fact, as far as I know, the ONLY engine with a "Z" was the BOSS 302.

 

OK, this page will tell you everything about your engine, found mine after reading half of it... ID your I6 Engine - http://www.classicinlines.com/Ident.asp

 

Right. This engine did have air conditioning, but the car did not. I've seen where the hoses go into the car for the under-dash unit in a 68 that had air, and the little plate that is in the firewall that is there on cars that DIDN'T have air is PRESENT on mine. However, the Engine that is in my car DID have air on it at one point.

I don't think this was the original engine, regardless if it came from a Falcon or a Mustang.