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Difference between Ford Racing M-9424-D302 & Vic Jr

General engine tech -- Drag Racing to Circle Track

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frnkeore
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Difference between Ford Racing M-9424-D302 & Vic Jr

Post by frnkeore » Tue Jan 14, 2020 1:43 pm

While I'm still awaiting more info on high rpm manifolds, I'm starting to collect parts for a 331, street build using a set of C5OE heads that I have.

I don't know the history of the Ford Racing M-9424-D302 manifold but have read that it's the same as the 2921 VJ. That doesn't seem likely, as the manifold height is a little different (5.35 vs 5.5).

What I would like to know is, the runner size and exit port size of the M 9424 manifold. The VJ, is suppose to be 1.9 x 1.08, I would be happy with something smaller, for those heads.

This engine would be limited to 6K rpm or 575 cfm and use a 600 or 660 cfm carb.
Last edited by frnkeore on Tue Jan 14, 2020 2:10 pm, edited 1 time in total.

mag2555
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Re: Difference between Ford Racing M-9424-D302 & Vic Jr

Post by mag2555 » Tue Jan 14, 2020 2:05 pm

Please clarify that last paragraph?

frnkeore
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Re: Difference between Ford Racing M-9424-D302 & Vic Jr

Post by frnkeore » Tue Jan 14, 2020 3:16 pm

The engine will be cammed to operate at a max of 6200 rpm. At 6000 rpm, it will pull 575 cfm of air for 331 CI, if it reaches 100% efficiency and I plan to use a 600 or 660 cfm carb.

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Re: Difference between Ford Racing M-9424-D302 & Vic Jr

Post by BigBlocksOnTop2 » Tue Jan 14, 2020 3:36 pm

Shit can the C5 heads....

frnkeore
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Re: Difference between Ford Racing M-9424-D302 & Vic Jr

Post by frnkeore » Tue Jan 14, 2020 4:58 pm

Big Block, this isn't about the heads, it's about the M-9424-D302 manifold.

This isn't a race engine, it's going in a '48 Ford PU, with a AOD trans.

With a relative, small amount of work, the heads flow 200 cfm and all I need for this. I'm hoping that the M-9424-D302 will have a little smaller runners & exit ports to work in this application, if not, there is the M-9424-F302, 180 deg version that is suppose to fit stock heads. It would probably make more since for my application but, I'd like to know more about the D302.

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Re: Difference between Ford Racing M-9424-D302 & Vic Jr

Post by Walter R. Malik » Tue Jan 14, 2020 5:42 pm

frnkeore wrote:
Tue Jan 14, 2020 1:43 pm
While I'm still awaiting more info on high rpm manifolds, I'm starting to collect parts for a 331, street build using a set of C5OE heads that I have.

I don't know the history of the Ford Racing M-9424-D302 manifold but have read that it's the same as the 2921 VJ. That doesn't seem likely, as the manifold height is a little different (5.35 vs 5.5).

What I would like to know is, the runner size and exit port size of the M 9424 manifold. The VJ, is suppose to be 1.9 x 1.08, I would be happy with something smaller, for those heads.

This engine would be limited to 6K rpm or 575 cfm and use a 600 or 660 cfm carb.
Same manifold with different name or number cast in the surface.

Find yourself an older Weiand 7515 X-celerator manifold or real old Edelbrock Torquer 289.
http://www.rmcompetition.com
Specialty engine building at its finest.

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Re: Difference between Ford Racing M-9424-D302 & Vic Jr

Post by mag2555 » Wed Jan 15, 2020 6:53 am

Even on a duel plane Intake a 650 cfm Carb is plenty good to net you 400 hp, which your unlikely to attain on a 331 cid motor in true NA everyday street usage form.

Why you would concider running a 660 Carb made for tunnel ram usage is leaving me scratching my head unless it was already reworked for single Carb use.

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Re: Difference between Ford Racing M-9424-D302 & Vic Jr

Post by frnkeore » Wed Jan 15, 2020 3:34 pm

Sorry about that, I hit the wrong number, it is a 650 cfm carb, not a 660.

I have a large collection of 1, 2 & 4 bbl carbs (about 100, or more). Smallest Holley 4v is a 450 off a 327 Rambler and largest is a 850 dp. I have matching pares of 550 & 600's but, no 660. Another carb that I have and will try with this build, is a 600 cfm 4100 Ford carb. They were common on the '60's 390's and I have one 480 or 450 cfm that came on 289's.

If any BB Chev guys need a correct Holley body for a HP 396, that ones for sale. I also have a odd ball 383 Mopar that has 600 pri & 850 sec, almost like a spred bore. It's not for sale, I want to try it on something.

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Re: Difference between Ford Racing M-9424-D302 & Vic Jr

Post by Walter R. Malik » Thu Jan 16, 2020 9:23 am

frnkeore wrote:
Wed Jan 15, 2020 3:34 pm
Sorry about that, I hit the wrong number, it is a 650 cfm carb, not a 660.

I also have a odd ball 383 Mopar that has 600 pri & 850 sec, almost like a spread bore. It's not for sale, I want to try it on something.
Holley produced a similar carb for the aftermarket, (a List 7010), but, screwed it up by using a reverse idle system.
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Re: Difference between Ford Racing M-9424-D302 & Vic Jr

Post by frnkeore » Thu Jan 16, 2020 7:05 pm

Here is a picture of that 4218 carb.
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Re: Difference between Ford Racing M-9424-D302 & Vic Jr

Post by Walter R. Malik » Thu Jan 16, 2020 9:10 pm

frnkeore wrote:
Thu Jan 16, 2020 7:05 pm
Here is a picture of that 4218 carb.
Holley also released in the aftermarket, 2 double pumper carbs with that type bore differential, (a 650 list 6708 and a 750 list 6709), but, they had reverse idle systems, also.
http://www.rmcompetition.com
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Re: Difference between Ford Racing M-9424-D302 & Vic Jr

Post by LaneD » Wed Jan 22, 2020 4:47 am

I have the Efi Engine and can use the Gas kit in my Petrol Car?

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