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Need part numbers for each Ram Air plenum variant
#1
May run into an opportunity involving an NOS Ram Air plenum, and I'd like to be able to ID - without actually tearing into the box necessarily - the variant I'm looking at, by part number.

Hence, if someone has the following, I'd appreciate it:
  • PN for '71/72 351C Ram Air plenum
  • PN for '71/72 429 Ram Air plenum
  • PN for '73 351C Ram Air plenum

Thanks!

-Kurt

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How to buy a '71-73 Mustang:
Rule #1: Assume all classic car sellers are guilty until proven innocent.
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#2
As far as I know, all the ram-air parts were the same for each engine combo, but the air cleaners were different depending on what engine you had.

I believe there were three variants for the ram-air air cleaners:
351 4V ( all variants)
429 CJ ( Rochester carb)
429 SCJ ( Holley carb)

This is just speculation though.
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#3
Kit Sullivan;161318 Wrote:As far as I know, all the ram-air parts were the same for each engine combo, but the air cleaners were different depending on what engine you had.

I believe there were three variants for the ram-air air cleaners:
351 4V ( all variants)
429 CJ ( Rochester carb)
429 SCJ ( Holley carb)

This is just speculation though.

Makes sense then - all the data I was digging up was for the differing Ram Air bases. Plenums are the same then.

Would you know if the flappers would be part of an NOS boxed set, or separate parts?

-Kurt

[Image: satellite-valiant-mustang-license-tags-signature.png]
How to buy a '71-73 Mustang:
Rule #1: Assume all classic car sellers are guilty until proven innocent.
Rule #2: No classic car dealer is ever innocent; thus, they are all guilty.
Rule #3: Buy from trustworthy people: Fellow forum members. Visit 7173Mustang's For Sale forum.
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#4
I don't think the seperate components of the entire system came as a "set" or an assembly from Ford (but I could be mistaken)

The air cleaners came as an assembly:
1) base
2) heater valve motor
3) heater valve junction block
4) vacuum hose
2) lid
3) lid hold down screw
3) Rubber seal
4) service decals(s)

The plenum was just a stand-alone part, but required seperate screws.

The inlets (flappers) required screws, hose hangers, vacuum hoses and tees.

The repro set-up available is a very good set, nearly indistinguishable from factory parts. And I think it comes with all neccesary components in one convenient package. All it needs is some blue "Ford" paint and some decals to look the part.
Unfortunately, it is only available for the 351-equipped cars (but will easily fit a 302 car).
There is no aftermarket 429 air cleaner assembly available, unless you want a fiberglass repro. They look pretty good but are easy to spot as a fake by sharp-eyed viewers.

Also, since ram-air was officially only available on 351 2-V engines from mid 72 and all of 73, I'm thinking the 73 version may have had a different part # for the air cleaner.
I'm thinking this because 73 was the first year of EGR plates under the carbs.
But...I'm not sure if the 2V engines in 73 had EGR. I know the 4V engines did.
If the 2V engines did NOT have EGR in 73, then that could explain one of the reasons why Ford never offered it on the 4V engines, since a new-for-73 only air cleaner base would have had to be designed to compensate for the added height of the carb due to the EGR plate.
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#5
Kit Sullivan;161328 Wrote:The plenum was just a stand-alone part, but required seperate screws.

The inlets (flappers) required screws, hose hangers, vacuum hoses and tees.

The repro set-up available is a very good set, nearly indistinguishable from factory parts. And I think it comes with all neccesary components in one convenient package. All it needs is some blue "Ford" paint and some decals to look the part.

I believe the plenum is the only NOS part of the Ram Air setup that is part of the lot I'm looking at (that and a pair of NOS taillights).

Thing is, the originality and completeness of what I'm getting is what matters - I have no intentions to use the part, but to sell it off to compensate for paying more than I wish for the other bits that come with the plenum.

The additional cost should work out approximately to what an NOS plenum goes for on eBay, but I figured I better know what I should be looking at before committing to anything.

Kit Sullivan;161328 Wrote:Also, since ram-air was officially only available on 351 2-V engines from mid 72 and all of 73, I'm thinking the 73 version may have had a different part # for the air cleaner.
I'm thinking this because 73 was the first year of EGR plates under the carbs.
But...I'm not sure if the 2V engines in 73 had EGR. I know the 4V engines did.
If the 2V engines did NOT have EGR in 73, then that could explain one of the reasons why Ford never offered it on the 4V engines, since a new-for-73 only air cleaner base would have had to be designed to compensate for the added height of the carb due to the EGR plate.

One of the other forums noted the '73 EGR problem, but the 2V's did have EGR. That, and the 2100/2150 carb is tall in its own right. Someone said a different air cleaner base was used, but I cannot find any year-specific Ram Air photos to determine such.

-Kurt

[Image: satellite-valiant-mustang-license-tags-signature.png]
How to buy a '71-73 Mustang:
Rule #1: Assume all classic car sellers are guilty until proven innocent.
Rule #2: No classic car dealer is ever innocent; thus, they are all guilty.
Rule #3: Buy from trustworthy people: Fellow forum members. Visit 7173Mustang's For Sale forum.
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#6
EPA wouldn't certify '73 4V. I think that was more of the reason than the carb height.

1973 Mach 1 Q code 351 4V, 9A paint, standard interior, 3.50 rear, C6 trans.
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#7
It wasn't that the EPA wouldn't certify the 351 4V. Ford had the 351 2V certified, and then tried to sneak by the rules and apply the certification to the 351 4V also instead of paying for a seperate certification.
They got caught, and decided not to pay, since it was a slow-selling option anyway. Hence, only 351 2V could come from the factory with ram air from that point.
However, Ford did put a little effort into advertising the ram air option as a dealer-installed option through the parts departments. Still, not a lot sold.

Today there are far more supposedly "factory equipped" ram air cars out there than what was actually produced.
Most Mach 1s you would see driving around in the 70s and 80s had the non-functioning ram air hoods without the tutone or the hood pins.
Nowadays nearly every mach 1 you see has the tutone and the pins, and many of them have the ram air system.

Very similar to the 69 Camaro with the SS/RS option ( fold-away headlamps). Many more on the road today than back when they were "current".
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#8
Kurt,

The PN for the plenum:

D1ZZ 16613A RAM AIR UNDER HOOD PLENUM

other related parts:

D1ZZ 9B624A RAM AIR SEAL

D3ZZ 9A626C RAM AIR DUCT ASSEMBLY RH

D3ZZ 9A626D RAM AIR DUCT ASSEMBLY LH

Ray

1971 Boss 351  
1972 Q code 4 speed convertible 
1971 Mustang Sportsroof  351-2V FMX 
1973 Mach 1 (parts car)
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