I just picked up a 302/C4 for my 56 F-100 and am in the process of identifying what I have. It looks to be a good find!





I've looked at the sticky reference and goggled quite a bit, but if someone here is a pro at identifying exactly what these #s are, it would be great.
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I think I have a (possible) HO 302 from a Mustang, but I want to nail down exactly what I have.

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My Casting # is 75ZY-6015-AA, which I have found to be a "Mexican 302". What's weird about the code is the 1st digit doesn't jive with decoding info I've seen. I think the "5" means it's a '75 and the "Z" means its Mustang?
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The Date Code is: 5M10A, which I have identified as a 1974-1977 – Is it a ’75?
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My aluminum intake manifold is a Ford RF-E3ZE-9425-FC, which I have found to be a 1983 HO 302 Mustang intake manifold, so I’m assuming this is from a newer vehicle.
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I will appreciate it if anyone can tell me more about my parts based on the numbers.
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Thanks, Joe

 

I think you are right on with your deductions so far. The Mexican block is considered stronger due to its Hipo 289 style main caps, and the stock Mustang 4V intake is a good street intake. But what determines engine performance is mostly camshaft and heads. You probably need to do some dismantling to determine what those are.

First check to see if there is a letter at the end of the cylinder heads on top, such as an R, S or T.

 

Hey Beanscoot -

On the end of the head is maked "C", with the valve cover off 302 cast on one side A3B on the other.

Joe

 

Mexican block question - I assume the gasket sets are the same? It seems like they would be.

I want to order a complete set (Ford Racing M-6003-A50 - Ford Racing High Performance Engine Gasket Sets - Application - SummitRacing.com) the Ford racing M-6003-A50, but wanted to make sure its right for me.

Summit didn't know anything about "Mexican block", so wanted to see if any here are familiar or would know if it's the right set.

Thanks--

 

Hi Joe,

The letters I mentioned are visible without taking the valve cover off and are on mid 80s and later heads. Yours is earlier, I would guess early 80s and back. To get the casting numbers on these years, you need to remove the intake manifold and use a mirror under the heads (another Ford bright idea). Then again, the A3A is the suffix of the casting number, and if it is on the top, then the prefix might in theory be on the top as well. It could be C80E or C9OE, could it be that all but the C was removed by machining?

It would be helpful to post pictures of the head, showing the casting numbers.

If the spark plugs seem not too oily, it might be worth just running it as is and postpone finding out the details.

 

whats the firing order on the motor? That will help you determine if you have an HO motor or not.

 

A 1975 Mexican block pretty much precludes it being a HO motor.

But there is a chance that it could have non-roller cam HO internals. Heck, it could have a 289 crank, or a stroker crank in it. Numbers from the damper might tell if it is 28 or 50 oz in imbalance.

 

Here's where I stopped today in my tear down. Heads off soon - then we'll really know. Are the intake ports smaller/larger in some heads? What should they measure? Thanks!









Hecho En Mexico:

 

not an HO, someone prolly took off the cast intake and found an aluminum mustang intake cheap.

looks like a pretty clean engine inside.

here are SOME of the 302 head casting numbers, valve size, and combustion chamber size.

302*/ 69-69 / C9ZE-A / 63CC / 2.23/1.71 BOSS 302
302*/ 70-70 / DOZE-A, D1ZE-A / 58CC / 2.19/1.71 BOSS 302
302 / 68-70 / C80E-F / 53.5CC / 1.78/1.45 Used on 4V Engines
302 / 68-70 / C7OE-C, G, C8AE-J, C8dE-F, C8OE-J, M, C8OE-K, L / 63CC / 1.78/1.45
302 / 68-70 / C9TE-C, DO0E-B / 58.2CC / 1.78/1.45
302 / 71-74 / D1TZ-A, D2OE-BA / 58.2 / 1.78/1.45
302 / 75-76 / D5OE-GA, -A3A, -A3B / 58.2CC / 1.78/1.45 First w/ Internal Air Injection Ports
302 / 77-77 / D7OE-DA / 69CC / 1.78/1.45
302 / 78-80 / D8OE-AB / 69CC / 1.78/1.45 Shared Application - 351W Stamped rockers
302 / 79-84 / D9AE-AA / 67.5-70CC / 1.78/1.46
302 / 85-85 / E5AE-CA / 67-70CC / 1.78/1.46
302 / 86-86 / E6AE-AA / 62-65CC / 1.78/1.46
302 / 87-93 / E5TE-PA, E7AE-AA / 62-65CC / 1.78/1.46
302 / 87-93 / E7TE-PA / 60-64CC / 1.78/1.46
302*/ 93-93 / F3ZE-AA / 60-63CC / 1.84/1.54 GT-40 Cobra
302*/ 94-95 / F4ZE-AA / 60-63CC / 1.84/1.54 GT-40 Cobra
302*/ 96-97 / F1ZE-AA / 63-66CC / 1.84/1.54 GT-40 Explorer
302*/ 97-00 / F77E-AA / 58-61CC / 1.84/1.46 GT-40P Explorer

 

Thanks Grey F-100,

I'll have the heads off soon and will use this chart!

 

Some good info posted by Grey F150, however "Ports" should read "Valve sizes, intake/exhaust". The ports are pretty similar in all 302 heads other than BOSS 302 which is a whole other type of head.

The only head on his list that ends with A3B is D5OE, with a 58cc chamber. That's a good small chamber, but the valves are not so large. It might also not have hardened valve seats.

Intake ports on pretty well all 289/302 engines are about 1.82" x .90"

 

One nice thing about most Mexican 302 blocks is that they have the heavier main caps
just like the 289 HiPos had.

 

I have the same block Id numbers, so when buying things for this engine. What do you tell them your putting it on? Year and model? Thanks for any suggestions

 

It makes no difference, for other than the beefier main caps, and the extra bosses cast into the front of the block, it's the same block as all other 68-79 302 blocks.

 

Exactlly ! But I doubt it has anything special in it based on the heads it's got. But you never know. He needs to flip it over and pull the oil pan off to see what's inside.