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  Mustangsandmore Forum Archive
  '69 to '73 -- The Musclecar Mustang
  351C 2V Block and Intake Question

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Author Topic:   351C 2V Block and Intake Question
TOPDowNMUSTANG
Gearhead

Posts: 281
From: Kennett Square, PA
Registered: Oct 2005

posted 04-05-2006 09:50 AM     Click Here to See the Profile for TOPDowNMUSTANG        Reply w/Quote
My 73 convertible is a 315C 2V. The car was originally owned by my dad since it was new. At some point in the 300,000 miles he put on it he had the engine replaced by some hacks who installed a used 351C 2V in it.

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?

------------------
'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

[This message has been edited by TOPDowNMUSTANG (edited 04-05-2006).]

71 Mach Me
Journeyman

Posts: 17
From: Fontana, CA, USA
Registered: Jan 2006

posted 04-06-2006 02:24 AM     Click Here to See the Profile for 71 Mach Me        Reply w/Quote

Not an expert here but, according to what I have read, the turkey pan gasket helps keep the hot engine oil from splashing against the underside of the intake manifold. Rule of thumb is always try to keep the intake manifold cooler for a denser charge/ spark.

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


71 Mach I
351C 4V
750 Holley
C6 Auto
3.50 Traction-Loc

TOPDowNMUSTANG
Gearhead

Posts: 281
From: Kennett Square, PA
Registered: Oct 2005

posted 04-06-2006 09:11 AM     Click Here to See the Profile for TOPDowNMUSTANG        Reply w/Quote
Thanks. I found the valley pan at Summit Racing.

Anyone have an answer to my other questions?

------------------
'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

DidgeyTrucker
Gearhead

Posts: 1813
From: Greenbrier, TN USA
Registered: Oct 99

posted 04-06-2006 04:12 PM     Click Here to See the Profile for DidgeyTrucker        Reply w/Quote
The #1 bearing is closest to the oil pump. I looked at a 400 once and #1 was perfect but by the time I got to #5 the crank need to be turned .125" (YES, 1/8") to clean it up.

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

Tracy

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 04-11-2006 06:33 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
quote:
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?

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.

***

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.

------------------
'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

TOPDowNMUSTANG
Gearhead

Posts: 281
From: Kennett Square, PA
Registered: Oct 2005

posted 04-11-2006 09:43 PM     Click Here to See the Profile for TOPDowNMUSTANG        Reply w/Quote
Thanks, Steve.

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.

------------------
'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

[This message has been edited by TOPDowNMUSTANG (edited 04-11-2006).]

Whitson
Gearhead

Posts: 290
From: Western Canada
Registered: Dec 2005

posted 04-12-2006 09:45 AM     Click Here to See the Profile for Whitson        Reply w/Quote
I've heard a theory that #1 main wears more due to over-tightening of the accessory drive belts (fan belt). That would explain upper half wear.

TOPDowNMUSTANG
Gearhead

Posts: 281
From: Kennett Square, PA
Registered: Oct 2005

posted 04-12-2006 10:43 AM     Click Here to See the Profile for TOPDowNMUSTANG        Reply w/Quote
That makes sense. I wonder if the engine also had a history of water pump bearing failure. I'll be sure to be careful when I tension the belts.

------------------
'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

SteveLaRiviere
Administrator

Posts: 48752
From: Saco, Maine
Registered: May 99

posted 04-12-2006 07:57 PM     Click Here to See the Profile for SteveLaRiviere        Reply w/Quote
quote:
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.


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.

------------------
'70 Mustang Mach 1 - '70 Mustang Convertible - '72 Mustang Sprint - '94 F-150 XL

TOPDowNMUSTANG
Gearhead

Posts: 281
From: Kennett Square, PA
Registered: Oct 2005

posted 04-12-2006 09:41 PM     Click Here to See the Profile for TOPDowNMUSTANG        Reply w/Quote
It's definitely a 2-bolt main block.

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.

------------------
'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

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