200 6 cylinder block identification

[kc5mhb]

Hi,

I've posted this information around the web and no one has been able to provide an answer to the mystery surrounding the engine in my '65 Mustang. I know the engine is not original due to the casting numbers but above the part number in the block casting there is an outward raised portion in the cast that reads SPECIAL. The block and other components are as follows:

Block: C6DE-6015B - 66 Block, not sure what the 'B' is for; possibly revision?
Intake: C7DE-6090-A - 67 Intake log with California Emissions ports.
Exhaust: D3DE-9430BA - 73 Exhaust Manifold

The biggest question is, What is so 'special' about this engine that it had to be cast stamped this way?

 

[170-3tree]

Not sure about the 200 but on a 170 that would indicate a slightly higher compression. It was actually a level between standard and the pursuit versions of the engine. I'm assuming pretty rare but can't justify that statement.

 

[kc5mhb]

That's the best I've heard so far. I've posted on the MCA site with no replies. Many have guessed it could have been a taxi motor or police engine but lacked any proof to back up the claim. Are you saying you have seen a 170 block with 'Special' in the casting? If this is correct, that may explain why the engine runs or lopes different from my wife's 66 Mustang 200 6. I have not gone through the engine yet but will possibly be tearing into it soon for a lifter replacement. While in there I'll probably change the timing chain, gears, and the oil pump. At that point I'll have to make the decision to replace the rings or leave as is, depending on the condition of the cylinder walls. Now I'm beginning to wonder if there is more compression, possibly the head is the wrong one for the engine.

 

[170-3tree]

I have not seen one myself, but I have a shop manual that indicates such an engine existed in the 170 and that rather than yielding 8.7:1 it had 9.1:1 and was good for about 5hp and 2 lb.ft of torque.

 

[kc5mhb]

http://i1227.photobucket.com/albums/ee436/kc5mhb/EngineBlock.png

Its not the best picture but you can see the writing.

 

[170-3tree]

I believe it would be the same situation, probably for a fleet vehicle of some sort.

How does the head casting match up?

 

[kc5mhb]

The intake manifold is from a '67 casting. From what I understand the 200 and 240 are the same size so I may start looking for a 240 head/intake/exhaust log. This car never did run right and frequently dropped the pushrods out from under the lifters. I've recently put ATF in the the oil to clean out the build up in the engine which has helped the lifters some. Car is going to the paint shop soon so after it comes back I'll be able to work the engine a little. Since I'll be replacing the lifters and any bent/worn push rods, the intake will be going to a machine shop to be machined and checked. Can you scan the page in the manual that refers to the 170 'Special' engine?

 

[rocklord]

The intake manifold is from a '67 casting. From what I understand the 200 and 240 are the same size so I may start looking for a 240 head/intake/exhaust log. This car never did run right and frequently dropped the pushrods out from under the lifters. I've recently put ATF in the the oil to clean out the build up in the engine which has helped the lifters some. Car is going to the paint shop soon so after it comes back I'll be able to work the engine a little. Since I'll be replacing the lifters and any bent/worn push rods, the intake will be going to a machine shop to be machined and checked. Can you scan the page in the manual that refers to the 170 'Special' engine?

Just to let you know, the 200 and 250 use the same head, not the 240. The 240 is in the same family as the big block 300.

In the late 70s, the 200 and 250 used the same head castings with similar combustion chamber sizes, so you can look at 200s also for the head you want. Look for heads with a casting code starting with D7, D8, E0, or E1. These heads will have the largest valves, intake logs, and hardened valve seats. The inline six was used in Mavericks, 80-82 Mustangs, Granadas/Monarchs, Fairmonts/Zephyrs, and some early 80s LTDIIs.

 

[kc5mhb]

Thanks. Guess I got my numbers mixed up.

 

[bubba22349]

Block: C6DE-6015B - 66 Block, not sure what the 'B' is for; possibly revision?
Intake: C7DE-6090-A - 67 Intake log with California Emissions ports.
Exhaust: D3DE-9430BA - 73 Exhaust Manifold

C6DE-6015-B part’s engineering number (Casting number) decodes as:

C = 1960's the Decade of Manufacture
6 = the Decade Year – This part was first designed for 1966 year
D = The Car line this part was originally designed for – Falcon - note: in 1970 D was changed to be for a Maverick when Falcon line was dropped.
E = The Engineering Department the part originated from – In this case is an Engine
6015 = Ford Basic part number - 6015 - is the number for an engine block
B = Design Change Level since original parts design

So yes you may be right but to really know the true year of a part you would need to find the casting date too. Many times castings were used for a number years with little change. Date code looks like a little raised tag with screw heads it will have a letter and numbers as an example "5H23" = Aug. 23, 1965

Good luck on your project

 

[170-3tree]

http://www.ehow.com/facts_7720893_ford-falcon-170-cid-performance.html


Sorry about the delay, I believe the book with that information is at my college for the time being, but to some extent, this gives more insight and a supporting claim to my statement.

Hope it helps a bit, I will try and dig that book up tomorrow.

 

[kc5mhb]

Block: C6DE-6015B - 66 Block, not sure what the 'B' is for; possibly revision?
Intake: C7DE-6090-A - 67 Intake log with California Emissions ports.
Exhaust: D3DE-9430BA - 73 Exhaust Manifold

C6DE-6015-B part’s engineering number (Casting number) decodes as:

C = 1960's the Decade of Manufacture
6 = the Decade Year – This part was first designed for 1966 year
D = The Car line this part was originally designed for – Falcon - note: in 1970 D was changed to be for a Maverick when Falcon line was dropped.
E = The Engineering Department the part originated from – In this case is an Engine
6015 = Ford Basic part number - 6015 - is the number for an engine block
B = Design Change Level since original parts design

So yes you may be right but to really know the true year of a part you would need to find the casting date too. Many times castings were used for a number years with little change. Date code looks like a little raised tag with screw heads it will have a letter and numbers as an example "5H23" = Aug. 23, 1965

Good luck on your project

Thanks, I'll look for the date code. I like what 170 3tree sent me on the 170 performance. Its quite possible this is a pursuit engine. Very interesting.....

 

[bubba22349]

Yes Ford made the special engines with higher compression for some sales markets (DSO) and Fleet uses. One was for the Denver, Co. area.