351w engine year codes location on engine? 1969 Mustang - Ford Mustang Forum
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post #1 of 16 (permalink) Old 01-13-2008 Thread Starter
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351w engine year codes location on engine? 1969 Mustang

I have a 69 mustang that was originally a 302 and now it has a 351w and i have no idea what year the engine is, so i can order parts for it... boo!
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post #2 of 16 (permalink) Old 01-13-2008
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The engine code should be on the block just under the exhaust manifold and above the freeze plugs. On a 351, I think it is on the p side rear. Don't quote me on that!

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post #3 of 16 (permalink) Old 01-14-2008 Thread Starter
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hmm ok i'll go and check.... i was told it was on the block behind the timing chain case on the driver side. No luck there tho.
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post #4 of 16 (permalink) Old 01-14-2008
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Laying on your back looking up at the engine, passengers side rear next to starter there is a ridge along the block just above where the oil pan bolts are. Bring a tooth brush soaked in gunk engine cleaner or spray some carb cleaner on the casting numbers and wipe with a rag.
You only need the first two symbols;
C9XXXX = '69
D0 = '70
D1= '71
D2= '72, ,etc.
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post #5 of 16 (permalink) Old 01-15-2008 Thread Starter
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ok i checked under the manifold on both sides and i couldn't find anything. i'll have to scub it down like you suggest because there is some gunk up in there. the only numbers i can find are on the manifolds themselves and one on the back of the water pump. on the p-side manifold it starts with D10e-, on the driver side C80E. the water pump says C80E-D, and of course there is a long one on the intake manifold. I never thought it would be so tough!
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post #6 of 16 (permalink) Old 01-15-2008
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The casting numbers are on the block are behind the starter. You have to remove the starter to see them. You will see numbers that look like this C90E-8015b. The first number will tell you the year. You do also have to remember that ford sometimes put engines left over from the year before in their cars. To truly tell if it is the original engine a partial vin number is stamped on the rear of the block on the passenger side right below the head on a flat spot on the block. Hope this helps.

Last edited by ontheball2; 01-15-2008 at 07:36 AM. Reason: wrong info
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post #7 of 16 (permalink) Old 01-17-2008 Thread Starter
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ohh ok i guess i have to suit up, brave the cold canadian weather and take the damn starter off. The numbers in the door indicate that it was originally a 302. I was assured when i bought it it had a 351. The guy i bought it off was a bit of a schyster tho. this is why i want proff and to be able to order the right replacement parts for it.
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post #8 of 16 (permalink) Old 01-18-2008
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What's the long casting number on the intake? 302's and 351's have different intake manifolds due the the different deck height. I think a 302 manifold is 9" wide where it meets the head, 351 being wider. You might also want to pull a valve cover to see what numbers you find there on the head (even though the 351 heads bolt on a 302). I know what's it like to have to work in cold weather so thought I might throw out some other options. Yep, the only way to trully id your block is to find that casting number just above the starter, should have 6015 in it. Even then, there were many different levels of either engines.
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post #9 of 16 (permalink) Old 01-21-2008 Thread Starter
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The intake number are 158426837B and C8A6J8425_B 8's could be B's tho.
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post #10 of 16 (permalink) Old 01-21-2008 Thread Starter
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Ok i just got back inside and here are the numbers i found BEHIND THE STARTER. 9C6 under that 0 C8OE-6015-A now i need yo figure out what that means......
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I found this a while back. See what you can come up with.

Good luck!
Attached Files
File Type: pdf eBay Guides - Decode your 65 66 67 68 69 70 Mustang Engine Block.pdf (157.6 KB, 3662 views)

1965 Convertible 200 I-6, C-4 Auto, Long Console, 6K Rally Pac, Power Top

1969 Mach 1 351 (W) 3-Speed Manual, Winter Blue, Deluxe Interior, All original.
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post #12 of 16 (permalink) Old 01-23-2008 Thread Starter
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so using the e-bay link i have found that it is a 289 made the 6th of march two weeks before the car was made (20th of march), which is supposidly good. but the vin number says it was a 302.
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post #13 of 16 (permalink) Old 05-07-2009 Thread Starter
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Smile

ok ok i know i'm an idiot.... took the valve cover off it said 302 on the heads. took the intake off for an upgrade, 302 stamped inside. took the starter off a year ago and the numbers plugged into the "how to rebuild a small block ford" book said 302 made in 69.... sweet!
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Speaking of long numbers on intake manifolds, I was cleaning the sludge off the back of my 1969's 302 when I found this code stamped into a brass plate, riveted/glued? to what I would consider the block, but could be the very rear of the intake. It reads "Z 2730 V 128375."

Any ideas? I looked up Ford codes for both blocks and intakes and couldn't find a code that started with a "Z" and looked like this.

That's the transmission to the left and a red/grey intake to the right. Intake is red, block is blue/grey, carb is 2BBL, water pump on passenger-side (if that helps, at all).
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I'd bet that is a tag that was put on by a machine shop that rebuilt the engine at some point in its life
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