Since I don't know anything about this engine's history, I didn't want to go through all the trouble of rebuilding it. It ran when I took the car apart so I figured I would simply replace all the gaskets and seals to get the car back on the road. Somewhere down the line I'll buy a rebuilt engine for it.

Finally - the question:

The block is a D2-- (72) and the intake has a D1-- (71) number on it. What differences should I be aware of in the pre-73 engines? Specifically, what are the differences in the earlier (71/72) intake manifolds versus the 73 manifold. I know the 73 has an EGR, so is the height of the 73 manifold lower?

Also, how important is it to use the pan style intake gasket instead of the ordinary intake gaskets that come with the rebuild kit?

And one more - Is it common for the #1 main bearing to wear more/faster than the others?

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'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"The best things in life are free, but the really kick-a** things cost a fortune."
My Site

Some 351C engine builders cut the turkey pan at the intake rails, and use a Fel-Pro or Mr. G intake set with silicone.

Anyone have an answer to my other questions?

So I don't know why your #1 shows the most wear. I would think it should show the least.

quote:

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Originally posted by TOPDowNMUSTANG:
The block is a D2-- (72) and the intake has a D1-- (71) number on it. What differences should I be aware of in the pre-73 engines? Specifically, what are the differences in the earlier (71/72) intake manifolds versus the 73 manifold. I know the 73 has an EGR, so is the height of the 73 manifold lower?

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The '71 and '72 manifolds should be a square hole carb mounting flange while in addition to the EGR plate and EGR valve the '73 manifold is a spread bore, using the 4350 carb mounting flange.

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Actually, I just noticed you were talking about a 2V, not a 4V. I would bet then the difference would just be the EGR plate and the passages feeding it.

The heights should be just about the same as the EGR is mounted to the carb spacer.

The block is: D2AE-CA

The intake is: D1AE-9425-DA. It does have the passage for the EGR, however the carb was mounted directly to the intake without a spacer on this engine. I want to install the EGR so it's original, so I have to get longer studs.

Is the intake correct for the 73 or is there a different intake.

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'73 Convertible, 351C 2V
'91 LX Convertible 5.0
Member: Valley Forge Mustang Club
"The best things in life are free, but the really kick-a** things cost a fortune."
My Site

quote:

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Originally posted by TOPDowNMUSTANG:
The block is: D2AE-CA

The intake is: D1AE-9425-DA. It does have the passage for the EGR, however the carb was mounted directly to the intake without a spacer on this engine. I want to install the EGR so it's original, so I have to get longer studs.

Is the intake correct for the 73 or is there a different intake.

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Good block, that's the Cobra Jet casting number. I have one and mine has 4 bolt mains, although Dan Jones mentioned they also came with 2 bolt main on occasion.

I'm not very familiar with the 2V manifolds and my MPC ends at 1972. Are you sure you aren't confusing the crossover port with an EGR port? I had a '73 Mustang once and I could have sworn it mounted the EGR on the carb spacer plate. I could be wrong, it's been 20 years since I owned that car.

What I meant was that there are holes and a channel under the carb spacer to allow exhaust to get under the carb - for the EGR. Although the engine didn't have an EGR or a carb spacer.