Holley 1904 carb question


IHC in the early to mid-fifties.

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Golden Jubilee
Golden Jubilee

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Post Thu Feb 04, 2021 8:21 pm

Re: Holley 1904 carb question

A little more digging, this time in the MT-103. The main jet for the BD220 was 73 376 R1, or a #64. Main jet for the BD240 was 73 375 R1, or #66. Main jet for the BD264 was 58 750 R1, and I'm not sure what the Holley number would be for that. But I doubt you would notice a difference between a #64 and a #66.

I think the bigger issue is the throttle bore and mount spacing. Going just from the insulator between the carb and manifold, the BD220 used 67 264 H, while the BD240 and BD264 used 61 976 HA. My guess is that the difference would be in bore diameter or mount spacing, so you would need to measure that to see if your carb would work as a spare for the 220.

Golden Jubilee
Golden Jubilee

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Post Fri Feb 05, 2021 8:56 am

Re: Holley 1904 carb question

Paul,
Between your and my answers, we could boil it all down to: If it fits on the manifold and the throttle plate doesn't hang up on the manifold, it will likely work fine! :D
edit: since my Holley Gov off a 282 fit the 220, it would seam all IHC 1bbl's use the same stud spacing, so as long as the throttle doesn't hang up in the manifold (and that can be "cured" with a spacer) it would seam they would work.
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Golden Jubilee
Golden Jubilee

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Post Fri Feb 05, 2021 9:44 am

Re: Holley 1904 carb question

Well, if you wanna put it that way... yes. :D

Golden Jubilee
Golden Jubilee

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Post Fri Feb 05, 2021 10:38 am

Re: Holley 1904 carb question

PaulH wrote:Well, if you wanna put it that way... yes. :D

Sometimes I get too far down "in the weeds" when clear answer is far simpler1

Yard Art
Yard Art

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Post Fri Feb 05, 2021 11:30 am

Re: Holley 1904 carb question

CB89, your Holley governor off the 282 actually didn't fit directly on the BD220, the holes were too wide. I had to have the mounting holes machined into slots to make it fit.
Last edited by DonO-MN on Fri Feb 05, 2021 7:08 pm, edited 1 time in total.

Golden Jubilee
Golden Jubilee

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Location: Lyman, IA

Post Fri Feb 05, 2021 11:56 am

Re: Holley 1904 carb question

Ahh, I didn't know that. From your earlier post I assumed it did, my bad!

Golden Jubilee
Golden Jubilee

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Post Fri Feb 05, 2021 11:54 pm

Re: Holley 1904 carb question

The Rochester carburetor from a 55 Chevy pickup 235ci engine fits the IH BD 240. Not sure how it will run yet but I’m going to see soon.
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9B1954CB-28BA-4084-8478-CBCBBCC3D12B.jpeg
1956 S-102 Short Bed BD240
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Rusty Driver
Rusty Driver

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Post Sun Feb 14, 2021 10:46 pm

Re: Holley 1904 carb question

Copied from my website:

Carburetor sizes – 1 barrel

The Society of Automotive Engineers developed standards for carburetor physical sizes. The more common sizes found on automobiles are listed below. Bore size is listed as approximate, as some carburetors were much more efficient than others.

Nominal ½ inch or 5/8 carburetor, center to center 1 13/16 on mounting bolts, bore size approximately 13/16 inch.
Nominal ¾ inch or 7/8 inch carburetor, center to center 2 ¼ on mounting bolts, bore size approximately 1 1/16 inch.
Nominal 1 inch carburetor, center to center on mounting bolts 2 3/8, bore size approximately 1 3/16 inch. (Often referred to as size 1).
Nominal 1 1/8 inch carburetor, center to center on mounting bolts 2 3/8, bore size approximately 1 5/16 inch.
Nominal 1 ¼ inch carburetor,center to center on mounting bolts 2 11/16, bore size approximately 1 7/16 inch. (Often referred to as size 2).
Nominal 1 3/8 inch carburetor, center to center on mounting bolts 2 11/16, bore size approximately 1 9/16 inch.
Nominal 1 ½ inch carburetor, center to center on mounting bolts 2 15/16, bore size approximately 1 11/16 inch. (Often referred to as size 3).
Nominal 1 ¾ inch carburetor, center to center on mounting bolts 3 5/16, bore size 1 15/16 inch. (Often referred to as size 4).
Nominal 2 inch carburetor, center to center on mounting bolts 3 9/16 inch, bore size approximately 2 3/16 inch. (Often referred to as size 5).

Jet size WILL have an effect on economy. Typically, 0.002 inch change in jet diameter is referred to as one size change. Although, using the words "Holley" and "economy" in the same sentence is.......................... ;)

Jon
Good carburetion is fuelish hot air!

If you truly believe one size fits all, try walking a mile in your spouse's shoes!

Owner, The Carburetor Shop in Missouri
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