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post #1 of 19 (permalink) Old 05-17-2019, 12:47 PM Thread Starter
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70 xl

I was told by the previous owner that my 70 XL is 428cu/7L V8 and on my V5 log book it states 7L, yet from it's VIN it comes out as a 390cu/6.4L V8.
I need to find an engine ID number which the manual says it should have, but it doesn't say where about. I have looked all around the engine and can't seem to find a plaque like it says. There are various numbers stamped into the block, but they don't seem to tie up to anything like what the manual is talking about. Comparing the actual engine to the manual it does look like a 428, but I am no expert.
Where is the engine ID supposed to be?
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post #2 of 19 (permalink) Old 05-18-2019, 08:16 AM
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Re: 70 xl

I assume that your car has a "Y" in the vin since you identified it as a 390cu. car. The 390/428 are the same family of engines, so externally they would look the same. I guess that it's possible that the previous owner could have put 428 innards in the block to make a 428cu. The 428 wasn't offered in the full-size 69/70's.

I will check my manuals when I get out to find the location of the stamping on the blocks. ...report back later. (tomorrow for you chaps across the pond).


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post #3 of 19 (permalink) Old 05-18-2019, 10:32 AM Thread Starter
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Re: 70 xl

cool,
I'll wait in anticipation
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post #4 of 19 (permalink) Old 05-18-2019, 10:53 AM
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Re: 70 xl

390s and 428s have different stroke lengths, which you can check without taking your engine apart:



FE Stroke Check


The only thing I would add is don't blindly trust the TDC marks on the pulley and pointer. The pulley has an inner and outer part that can slip over time relative to one another. Or the pointer can be the wrong one and off. Once you have the piston at TDC according to the pointer, rotate it slightly back and forth while holding the hanger to feel for movement and use that to determine when the piston is truly at the top. And when measuring, keep the hanger perfectly parallel to the cylinder, not crooked.


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post #5 of 19 (permalink) Old 05-18-2019, 11:45 AM Thread Starter
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Re: 70 xl

another cool answer, I'll definitely be trying that...Monday now, we are at a show tomorrow.
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post #6 of 19 (permalink) Old 05-18-2019, 08:59 PM
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Re: 70 xl

According to this site:

3. The VIN is typically stamped on the back of the engine block or on the back of the cylinder head. Before January 1968 Ford stamped these for warranty purposes and then only on high-performance engines. After January 1968 it was stamped on almost all blocks or heads as part of Department of Transportation regulations against automobile theft.

...copied from here --> http://www.mustangandfords.com/how-t...bra-jet-engine

Here, they are talking about a 429, but it is still in the same position:

4) Engine Block Serial Number
The serial number (aka partial VIN) is stamped on the rear face of the 429 block just below the driver's side head. The first two and last six digits of the vehicle VIN (ex: 1F123456) are shown in the photos below. The first digit ("1") denotes 1971, the second digit ("F") is the Assembly Plant code. The remaining six digits are the last six of the vehicle VIN. If the vehicle was a Mustang, this six digit number starts with a "1". If it was a Cougar, it starts with a "5". Note that this serial number may be nearly impossible to see when the engine is installed in the car.

...copied from here --> Decoding

Good Luck!
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post #7 of 19 (permalink) Old 05-19-2019, 11:35 AM Thread Starter
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Re: 70 xl

Thanks for that, I'll have a look, although it sounds like it could be quite hard to find
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post #8 of 19 (permalink) Old 05-23-2019, 08:37 AM Thread Starter
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Re: 70 xl

There are numbers stamped all over that engine, none in the places that says.
none of them make any sense what-so-ever, when it comes to decoding them.
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post #9 of 19 (permalink) Old 05-23-2019, 01:42 PM Thread Starter
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Re: 70 xl

found another one that does tie up with what was said on the other post it's a date stamp, and it looks like this:-

W I
7H 22

What does that mean?
Can't seem to see any decode info for that in my manual.
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post #10 of 19 (permalink) Old 05-23-2019, 03:10 PM Thread Starter
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Re: 70 xl

Quote:
Originally Posted by drov3r View Post
found another one that does tie up with what was said on the other post it's a date stamp, and it looks like this:-

W I
7H 22

What does that mean?
Can't seem to see any decode info for that in my manual.
here's another one which looks a lot like an engine code, but again doesn't make any sense with my manual decode.
C7ME-A
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post #11 of 19 (permalink) Old 05-24-2019, 05:45 AM Thread Starter
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Re: 70 xl

Quote:
Originally Posted by drov3r View Post
here's another one which looks a lot like an engine code, but again doesn't make any sense with my manual decode.
C7ME-A
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post #12 of 19 (permalink) Old 05-25-2019, 12:06 PM Thread Starter
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Re: 70 xl

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Originally Posted by drov3r View Post
photo attached
Finally got my head around the coding.
It could be any one of 3 types, all from 1967.
either a:-428 FE Med block 2 bolt mains, cobrajet or police
:-428 FE Med block 2 bolt mains
:-390 FE Med block 2 bolt mains (now this ties up with the VIN, but not what the previous owners have told me and what is in the extensive history file that came with it)

The number on the head C8AE-H comes out as a 390 head too.
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post #13 of 19 (permalink) Old 06-12-2019, 02:29 PM
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Re: 70 xl

Nice to see another 70 XL out and about. Does the extensive history file say when the engine swap was done? As noted previously, the 428 was not available in these cars, so you'd think it would be noted to support the provenance. Many of the FE parts were used on any and all displacement versions of the engine, so the C8AE-H head was likely found on more than 390 CID engines. Post up some pics, give us a look.

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post #14 of 19 (permalink) Old 06-13-2019, 11:57 AM Thread Starter
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Re: 70 xl

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Originally Posted by 70XL View Post
Nice to see another 70 XL out and about. Does the extensive history file say when the engine swap was done? As noted previously, the 428 was not available in these cars, so you'd think it would be noted to support the provenance. Many of the FE parts were used on any and all displacement versions of the engine, so the C8AE-H head was likely found on more than 390 CID engines. Post up some pics, give us a look.
Hi, nothing in the history file about an engine swap, but most of that file is from the UK. All I have from the US is a certificate of title.
I did read somewhere that the 428 and 429 were a special fit to these cars and there is a letter in the history file from someone who has done some research for a previous owner, and his research turned up that it is a 428 police interceptor engine.(hence where the previous owner got it from) I'm tempted to get a Marti report done for it, but on their website they don't have a link for the XL.
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post #15 of 19 (permalink) Old 06-13-2019, 04:23 PM
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Re: 70 xl

Quote:
Originally Posted by drov3r View Post
Hi, nothing in the history file about an engine swap, but most of that file is from the UK. All I have from the US is a certificate of title.
I did read somewhere that the 428 and 429 were a special fit to these cars and there is a letter in the history file from someone who has done some research for a previous owner, and his research turned up that it is a 428 police interceptor engine.(hence where the previous owner got it from) I'm tempted to get a Marti report done for it, but on their website they don't have a link for the XL.

The Marti report will tell you what the car was born with based on the VIN number. The 429, which is the 385 series, or sometimes called the Lima engine, or Big Block Ford, was just one of the engine options available in these cars. I believe the engine options were a 240-l6, 302W -V8, 351W - V8, 390FE - V8, and 429 - V8. The 428 is a FE engine and would be straight swap for the 390 your VIN says the car was born with. At this point, in the absence of any real and reliable documentation, about the only way to know if your engine is what you were lead to believe it is would be to disassemble it and document the internal parts to find out if they are indeed for a 428 Police Interceptor engine.

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