Topic: 67 390 intake use dates

[preaction]

Was the C6AE-G intake used in early production for the 390 and then switched to the C7AE-E at some point for a Dearborn built car ? If this is the case about when was the switch over.

[BKnapp]

I do believe there was a change and this seems to be supported (with no definitive date) by the information on Mustangtek. I have been talking to several people and it seems like the change over occurred sometime around December 66. However, I still have a couple of questions.

First, would it be more accurate to use the engines build date, or the cars build date?

Second, my serialized date was 11/22/66, my scheduled build date was 12/2/66, but actual build date was 1/4/67. What would cause such a gap between scheduled and actual dates? I have talked with another San Jose S code owner whose Scheduled and Actual dates are both 12/15...according to Marti.

Lastly, when determining a change for something like an intake, would it be more likely to use the engines build date or the cars build date? Similarly, as I try to correct things on my car, it looks like the few items I have tried to address had changes right around my cars dates. Is it more appropriate to use the scheduled or actual date?

I suspect the answers will be it depends, but was curious on others thoughts. Sorry for newbie questions, but I need to start somewhere.

[Bob Gaines]

I do believe there was a change and this seems to be supported (with no definitive date) by the information on Mustangtek. I have been talking to several people and it seems like the change over occurred sometime around December 66. However, I still have a couple of questions.

First, would it be more accurate to use the engines build date, or the cars build date?

Second, my serialized date was 11/22/66, my scheduled build date was 12/2/66, but actual build date was 1/4/67. What would cause such a gap between scheduled and actual dates? I have talked with another San Jose S code owner whose Scheduled and Actual dates are both 12/15...according to Marti.

Lastly, when determining a change for something like an intake, would it be more likely to use the engines build date or the cars build date? Similarly, as I try to correct things on my car, it looks like the few items I have tried to address had changes right around my cars dates. Is it more appropriate to use the scheduled or actual date?

I suspect the answers will be it depends, but was curious on others thoughts. Sorry for newbie questions, but I need to start somewhere.

To better understand the gap  you are questioning you have to first understand what the build date means. The build date  is not when the car was started on . The build date is when the car was finished. It is hard to imagine that the cars logistically started from a collection of preformed sheet metal panels ,welding together into a running driving ,painted car on the other end of the assembly line all in one day. Keeping that in mind , a car could be at some point in the system and something happened to slow the process. Delayed parts are the most common scenario IMO . It maybe was not even started on because a delay in parts would not be available until a future date. In any event the car would typically be started on in enough time to be finished with a "best case " projected time which would be the "scheduled" build date. If something happened to delay the finish then the delay would cause a change of the day it was finished . The day the car was finished is the actual build date. This is just my opinion based on the information we do know for a fact along with observations and logical deduction. Someone else may have a different opinion.

[J_Speegle]

Second, my serialized date was 11/22/66, my scheduled build date was 12/2/66, but actual build date was 1/4/67. What would cause such a gap between scheduled and actual dates? I have talked with another San Jose S code owner whose Scheduled and Actual dates are both 12/15...according to Marti.

The scheduled date was just a guess. The date it was serialized was when the car (not a real body just an order for a car) was assigned a VIN and the actual was when the car was really completed.

From our discussions with the managers when a car was built could be effected by the type of order, availability of parts, issues with certification and a ton of other possibilities. Car would not have started of being physically built until all of these things were address and all the parts were available at that car plant

Longest stretch between the actual build date and the others was 8 months. Of course this didn't mean there was a particually built car they wheeled around the plant to keep it out of the way for all those months

Lastly, when determining a change for something like an intake, would it be more likely to use the engines build date or the cars build date? Similarly, as I try to correct things on my car, it looks like the few items I have tried to address had changes right around my cars dates. Is it more appropriate to use the scheduled or actual date?

For your specific need now the engine assembly date stamped on the block if its the original. Also use other similar cars dating from same time period (engine assembly dates) from any of the car assembly plants since the engines were all built at the same place. Even consider 2V's and such placed in other Ford products to increase the sampling determine a date range for your specifici need

[BKnapp]

Thanks guys... I think I have a fair understanding of the various dates themselves and what they mean. I figured the delay between "scheduled" (projected) and "actual" was due to part shortage or something similar.

I found it odd that there was a San Jose S code serialized a couple of weeks after mine whose scheduled date was 12/15 and actual date was 12/15....built as scheduled. I have the same S code engine at the same plant, scheduled 12/2, but actually built 1/4/67...I will guess the difference may have been smog, heavy duty suspension or something similar.

As for the OP, I don't think it is too much of a stretch for a car built around these dates to have a C6AE-G intake with the larger thermostat. I have yet to see a C7AE-E with a build date before 7B*.

[Bob Gaines]

Thanks guys... I think I have a fair understanding of the various dates themselves and what they mean. I figured the delay between "scheduled" (projected) and "actual" was due to part shortage or something similar.

I found it odd that there was a San Jose S code serialized a couple of weeks after mine whose scheduled date was 12/15 and actual date was 12/15....built as scheduled. I have the same S code engine at the same plant, scheduled 12/2, but actually built 1/4/67...I will guess the difference may have been smog, heavy duty suspension or something similar.

As for the OP, I don't think it is too much of a stretch for a car built around these dates to have a C6AE-G intake with the larger thermostat. I have yet to see a C7AE-E with a build date before 7B*.

I don't pay attention to casting dates on 390 intakes because they are not my field of interest but was wondering what is the latest casting date you have found on a C6 marked intake?

[BKnapp]

I have read others having Oct and Nov, but so far mine is the latest 6M1.

[67gtasanjose]

Was the C6AE-G intake used in early production for the 390 and then switched to the C7AE-E at some point for a Dearborn built car ? If this is the case about when was the switch over.

I assume you are asking about your December '66 built example in your signature? (assuming this is ACTUAL build date)

That question being asked to focus on your question. You haven't answered either yet whether your block (if original) has an assembly date that is consistant with an ACTUAL build date of the car.

All of this information so far is "Good to know" from a 67-68 Judging standpoint but without a specific date to start with AND a specific date this change-over occurred (set by unrestored examples), how could we even get close to answering a "Cut off date" kind of question?

Maybe this thread will help as more information is shared but so far, I only get confused by what has been shared to this point in this thread. Am I alone? Did I miss something?

[preaction]

You are right it did lose its way a bit. I was asking about the 12/66 car as it has a 3/69 390GT intake on it and to get the correct one for it I asked if anyone knew of a cutoff date for the C6-G intake.

[67gt390fb]

I believe the C6AE-G would have been used in earlier 1967 model production,  I have just seen a C6AE-G intake for sale with a 6M9 casting date,  that is the latest date I have seen so far for that intake.  the earliest  C7AE-E intake I have seen was 7B7,  so...?

[krelboyne]

Old thread I know ........

We are detailing a 1967 Cougar GT with 40k original miles. It has the C6AE-G intake manifold dated 6M6.  Stamped engine assembly date is 7A16, Dearborn built.

[Bob Gaines]

Old thread I know ........

We are detailing a 1967 Cougar GT with 40k original miles. It has the C6AE-G intake manifold dated 6M6.  Stamped engine assembly date is 7A16, Dearborn built.

I would think given the 7A16 assembly that the would be the C7 intake designed for the smaller thermostat instead of the C6 intake. I had read in the previous forum threads that the changeover was sometime around the first of December 66 . I am under the impression that the C6 intake would have too large of a hole and the smaller thermostat would not work properly . The C5AE thermostat housing would use the large thermostat and work with the C6 intake . The C7AE thermostat housing would take the smaller thermostat and work with the C7 intake. You might want to check into this logical progression perspective to see if it holds water . I admittedly do not work with a lot of 390's .

[krelboyne]

Bob, a little more information to submit. Dearborn built 1967 Cougar.

1967 Cougar S code 390GT, sold in California with thermactor emissions. Per the Marti Report the actual build date of this car was 1/23/1967. Scheduled for build 1/27/1967.
Engine block casting date: 7A12, 1/12/1967.
Cylinder heads both dated 7A4, 1/4/1967.
Exhaust manifolds 7A5 and 7A10, 1/5/1967, 1/10/1967.
Intake C6AE-G dated 6M6. 12/6/1966.
Distributor C7OF-12127-F dated 6L23. 11/23/1966.
Holley Carburetor C7OF-9510-D, dated 712. Second week Jan. 1967.

Engine assembly date 7A16, stamped on the block. 1/16/1967.