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Author Topic: Survey - Engine Assembly and Valve Cover Style  (Read 2964 times)
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J_Speegle
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« Reply #30 on: February 16, 2017, 07:18:06 PM »

.............. it also would be nice to see a survey for all steel hoods which mine has.
Dave

If you do that I suggest that you also collect what style/design the hood is and the stamping date of the liner/bottom panel they have to provide the most complete picture and so you don't have to repeat the survey to collect additional data points at a later date  Chug a Lug

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Jeff Speegle
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6S1640
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« Reply #31 on: February 16, 2017, 10:41:50 PM »

Four new entries.  The transition date from open to closed COBRA lettered valve covers should actually be identified as a Cleveland engine assembly date.  An actual switch date could be determined with enough engine assembly dates in the February 1966 time frame.  Because we know SAI did not build the cars in the same order as the engines were assembled, we will find a mix of valve cover styles in the SAI VINs, but by engine assembly date there should be no mix.  For example 6s1460 by SAI VIN comes after 6S1449 with an out of order mix, but when you look at their respective engine assembly dates, the corresponding valve cover styles and dates are consistent with early part of February are open letter and later are closed, no mix.  Somewhere between 2-2 and 2-25 was the switch date.  6S1855 is still an anomaly.

Cory



* OpenOrClosedCOBRAvalvecovers021617.jpg (59.18 KB, 503x668 - viewed 116 times.)
« Last Edit: February 16, 2017, 11:15:45 PM by 6S1640 » Logged
GT350Lad
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« Reply #32 on: February 17, 2017, 02:34:09 AM »

Nice one guys  Chug a Lug

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6S273
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« Reply #33 on: February 23, 2017, 10:56:12 AM »

6S1097 -- 6A?5H date code, had open letter valve covers when I bought it in 87,


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6S1097
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jk66gt350
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« Reply #34 on: February 23, 2017, 12:23:14 PM »

6S1575, I believe the engine assembly date is 6B25, it has had open letter valve covers on since I've owned it (1986) and all the info I got from the two previous owners would suggest the valve covers were original along with most other aspects of the car, but I have no conclusive proof that the car did not originally come with closed letter covers, which the data I've seen suggests should have been correct.  An exception to the norm?  Looks like we will never know for sure.  I bought a set of closed letter covers a few years ago, so I have both bases covered.

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CSX4781
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« Reply #35 on: February 26, 2017, 05:20:51 PM »

My GT350 (6S1342) is a bit of an anomaly from the standpoint of engine assembly date- mine still has its original open letter valve covers and engine; 5K21M assembly (5K21 oil pan rail), 5K5 block casting date. My engine assy is out in left field compared to earlier cars with later dates, but it is indeed the orig block (matching Ford VIN, was in the car when I bought in 1982).

Dave

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6S1640
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« Reply #36 on: February 26, 2017, 08:32:34 PM »

Hi All,

Based on the three new entries, the data suggests the switch over date was near February 24 and 25, 1966.  There is a mix of open and closed valve covers on these two dates.  Prior to 2-24-66 are all open and after 2-25-66 are all closed. Keep the entries coming.  It would be interesting to learn the engine assembly on 6S1855 or find out a previous owner made the swap from closed to open.

Cory



* OpenOrClosedCOBRAvalvecovers022617.jpg (64.7 KB, 500x725 - viewed 106 times.)
« Last Edit: February 26, 2017, 08:37:21 PM by 6S1640 » Logged
SFM66H
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« Reply #37 on: February 27, 2017, 10:00:18 AM »

Cory,

Sorry for taking so long to participate:

6S1615's engine assembly date is 6C9F (March 9, 1966) and I have a 1976 photo of it with closed letter covers, which I feel are original to the car.

Kieth

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1966 GT 350H owner since June 30, 1976
GaryCBergman
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« Reply #38 on: February 27, 2017, 10:39:24 AM »

SFM6S299 has an engine assembly date of 5K22M and has open letter valve covers.

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CSX4781
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« Reply #39 on: March 04, 2017, 04:31:44 PM »

A friend of mine who once owned 6S1358 had recorded the casting and assembly dates from the original engine block (which had the ears broken off from a blown up clutch in the early 70s)- 5M4 casting date and a 5M9B assembly date, and the car has it's original open letter valve covers (which were in place when he bought it in 1970). Interestingly, although the engine dates and SFM number are both later than 6S1342, the Ford VIN is almost 50 cars earlier, and the dates on both engines are considerably earlier than the above listed cars in the 1000-1100 range.

Dave

« Last Edit: March 04, 2017, 04:36:24 PM by CSX4781 » Logged
Gt350t
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« Reply #40 on: March 05, 2017, 11:52:27 AM »

6S1232

Block date Code 6B3

Assembly date 6B3. The 3 is very faint.

Current valve covers since 1976 Shelby marked aftermarket.

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6s1802
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« Reply #41 on: March 30, 2017, 08:30:44 PM »

6S1802 closed letter with hold down tabs. The poor ol thing has had more engines than Mickey Rooney has had wives so I don't have a dated block.

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