Hello everyone,
Can anyone help me decode this number cast on the intake manifold of a 4V 351C?

D3ZE9425AA

Thanks!

 

1973 Mustang intake.

 

D3 = 1973
Z = Mustang
E = engine part
9425 = intake manifolds
AA = 1st design (A) with first revision (A)

 

Thanks,
Any differences between 1970 thru 1974 4V clevelands?

 

Is it true that the 73 351C-4V doesn't have valves as large as the other Clevelands? If this is true, Should I be disappointed? (I kind of am to be honest with you! I had known this before, I would've looked for another cleveland!!!!)

Here's what I found online:
"Note: Beginning in early 1973, many 4V head castings were fitted with smaller valves (2.04" / 1.65") - the same as those used in the 351C-2V. There's some debate as to whether Ford made this change across the board in 1973 or if some 1973 engines were built with full-size (2.19"/ 1.71") valves. If you're going to the trouble to upgrade to 4V heads, a safe bet is to use one of the two basic types (open, closed) manfuactured in 1970, 1971, or 1972. Always measure the valve diameters. Look for pre-1973 casting numbers beginning with D0, D1, D2, and steer clear of D3 (e.g. D3ZE casting number) unless you can actually measure the valve diameter."

 

Yes, you can find the big port, open chamber heads with the 2V valve sizes. I've seen several sets but I have never researched to see if all were like that or if it was a running change during the 1973MY.

As for your previous question, yes there are many differences between the various Clevelands offered from 1970-1974. 2V motors stayed pretty much the same. The 4V motors could be had with several different intakes and carb combos, mechanical and hydro cams, dual point and single point dizzys, and closed chamber heads (70-71) or open chamber heads (72-74). If you look around on the web, there are several sites that list the various differences between the H, M, R, Q code engines built from 70-74.

 

So, does that mean that my engine is not as good as other clevelands? What advantages does mine have?
Being the valves smaller, low end torque would be higher right?
I guess what I mean is, what advantages does my engine has to offer against other clevelands.

 

It really doesn't offer any real advantage but that doesn't mean it isn't worth keeping. You can rebuild the heads and have the larger valves installed and those open chamber heads would then perform just like anyother open chamber 4V heads. All the later Cleveland motors have the 4 degree retarded timing chain set so it would not matter if your motor was a 72-73-74 as that would perform the same. The 73 is a good starting point for a strong motor as the block, crank and rods are all good pieces. The bare heads are a good starting point if you want to build a motor that will run 9:1 compression and pump gas.

 

I feel much better now!
How about:

"Being the valves smaller, low end torque would be higher right? "

 

Ok, I finally got to see the number cast on the block by the starter.
Number is: D2AECA
3L12

Bear in mind that the intake number is D3ZE9425AA
Could it have been changed? Does the block production year define the kind of heads I have and not the intake?

Thanks

 

November 12th 1973 is the date code. The casting code is 1972 Automobile Engine. The date code is the one that matters most.

This could have been in a '73 Model year Mustang with a 4V carb.

 

A D2xx block could be found in both 72 and 73 cars so in some small way you could say that the block does define what heads you have as you would not find open chamber 4V heads on a stock 70-71 motor and you would not find closed chamber 4V heads on a 72-73 motor unless those were swapped on at a later date. From what you have posted, your motor sounds pretty normal. It's not a bad starting point for a good mild compression build. As for dates matching, that doesn't matter unless you are trying to restore a car to concourse condition. As for the intake, I'd pitch it and run a decent alloy intake unless you just want to keep the engine bone stock.

 

Ok, I opened that baby and it is is in great condition, it's a 73 and came with the valves the same size as the 2V heads, even though it is a 4V... 2 bolts mains Open chamber.
Any comments on the motor mounts to put the Cleveland in my 1988 F-250 with a stock 4.9L 300?
Having the smaller valves won't produce more low end torque?

 

You can use the same motor mounts and frame mounts that were used with the 302 and 351W which were both available in the 1988 F-series trucks.

 

D3ZZ-9424-A .. 4V Intake Manifold ~ Used on: 1973/74 Torino / 1973 Mustang.

D2AE-CA = Casting numbers on bare blocks cannot be transposed to actual part numbers.

While the Z in a Ford engineering or casting number means Mustang, that doesn't mean the part it's on was used only on a Mustang. It might have been used on any car or truck from the time period.

351C bare blocks: D0AZ-6010-C .. 2 bolt main caps = 1970/74 / D1ZZ-6010-D .. 4 bolt main caps = 1970/74 (D1ZZ is an updated p/n)

Magnaflux that block! Ford 351C 4V blocks were subject to sand casting problems. Ford sent the dealers a campaign letter and a part number that could be used to repair them. The part number was for a Metallic Filler Kit that was to be poured into the sand casting holes. I'm not kidding = C6AZ-19554-A .. Metallic Filler Kit ~ Composed of: 1 can-metallic resin, 1 jar-hardening agent.