What Engine Do I Have?!?!

[Anonymous]

Got a '66 mustang with a ford 6-cylinder engine. The code on the intake manifold is C9DE-6090M. The code on the exhaust manifold is C8DE. The code on the block looks like this:
18
C8DE
G015-B

Hmmm.. Can anybody tell me what I have? There is a Carter YF carb on the car. What carburetor SHOULD I have?

Am I right in assuming that the intake manifold isn't what originally went with the other parts?

Thanks a bunch.

 

[CZLN6]

Howdy Strikerd:

The casting codes indicate when the casting design change was initiated. It is possible that the code date and the model year are not the same. The C9-M head is from a '69 casting design. It will have a 1.75" carb hole like all later heads, and a larger volume intake log with a flat top. this is a rely good head to modify for a direct mounted two barrel.

The exhaust manifold C8 code is from a '68 casting design. This is my favorite cast exhaust manifold to modify for a stealth look.

The C8-B block is a '68 200 casting code.

The Carter YF was not used on Mustang 200s until the '70 model year. However it goes with the "M" head really well.

You have a mix-and-match combo. The C9-M head was primarily a 250 head, but was used on some '69 and '70 200s as well. Given the casting codes it is plssible that this head came from the factory with this block and exhasut manifold, but no guarentees. None of these parts came on a '66 Mustang.

Adios, David

 

[Anonymous]

Thanks for all that information..

If not the Carter, what carb would have been mounted on the C9 head? I tried to put an Autolite on it but discovered that the Autolite had a different diameter than the intake manifold.

Thanks again! Great info.

 

[CZLN6]

Howdy Back:

There's nothing wrong with the Carter YF. It became the stock 200 carb in the 1970 model year. Did it come with the C9 head?It is not the stock look for a '66 Mustang though. If that's important to you. I guess I should ask, What is your goal?

Another question is what distributor are you using? A Carter YF with a ported vacuum source will not work very well with a '67 and earlier Load-a-Matic distributer. The L-a-M needs a carb with a spark control valve to function as designed.

Adios, David

 

[Anonymous]

David,

My goal is to get the thing running reliably.

I've got a '66 shop manual so wanted to try to put an Autolite on it. The different diameters didn't allow for that -- which is when I realized that the engine was not original (the car was a gift from my brother...he had the body done but left the engine tinkering for me).

I rebuilt the Carter YF but (still) am having stalling problems when I accelerate from a stop with a warm engine. Accelerator pump looks fine - when I ask my son to step on the gas I can see a squirt. Yes, the Carter came with this engine but I don't know if it was original to the engine or not.

I guess checking the timing is next.

In answer to your question, I don't believe I have the L-M distributor because it doesn't look like the L-M distributor in my '66 shop manual (no little springs that allow for turning...)

Part of the reason for finding out what engine I DO have is to get the appropriate shop manual for it. Would you suggest getting a manual for a 68 or a 69 Mustang?? Or is my '66 manual good enough? I don't know if the 200 engine/ specs changed during those years.

Thanks again -- I do appreciate your knowledge!

Dawn

 

[hotrodbob]

It seems like you need a manual for the carb and distributor.

 

[CZLN6]

Howdy All:

Strikerd- Here's the mystery. The '68 & '69 200s are advertized at 115 Hp@ 3,800rpm, and 190 ft Lbs torque @ 2,200 rpms. It is advertized at 8.8:1 compression. They have a better distributer/ignition advance but less CFM from the non SCV Autolite 1100.

THe '65- '66 are advertized at 120 HP at 4,400 rpm, and 190 Ft lbs of torque at 2,400 rpms. They are advertized with a compression ratio of 9.2:1. They have a bigger cfm carb, but the rather archiac Load-a-Matic distributor advance system

They both have a small dish piston and a chamber size of 52 ccs.

Best I can tell is Fords advertizing dept. is not in communication with the engineering Dept.

Neither used the Carter YF. However it is a good choice for your setup as it has no SCV and is back up to a 187 cfm rating.

IIWIYS- I'd buy a rebuild kit and tune the YF to the enclosed instruction sheep as a '70 Mustang 200. I'd buy a shop manual for a '66 Mustang and forget the casting codes.

Adios, David

 

[Anonymous]

IIWIYS- I'd buy a rebuild kit and tune the YF to the enclosed instruction sheep as a '70 Mustang 200. I'd buy a shop manual for a '66 Mustang and forget the casting codes.

I like that advice. Just one last thing: what does CFM stand for?

Appreciate all the help

 

[mugsy]

CFM = Cubic Feet per Minute. It is a typical unit of measurement for air/gas flow.