The Ford Barn

1930artdeco · 05-09-2018, 11:31 AM

I am going to get an A manifold punched for my Model B carb. I am just curious if I reattach an A carb, will it matter? Or, will the larger throat opening cause issues with turbulence and vacuum?

Thanks,

Mike

MickeyT · 05-09-2018, 01:31 PM

It won't cause any problem at all. I'm doing it right now as my B carb. is in for repair so I'm running an A carb. on a bored out A manifold

Herb Concord Ca · 05-09-2018, 03:04 PM

Hi Mike, that what I have on my slant T/S. It's run fine for years with a Tillotson and now Marvel carbs.
Make sure the shop references off the bore and not the flange.

Purdy Swoft · 05-09-2018, 03:53 PM

According to the Piranios dyno sheets site , a bored out model A intake manifold will help, even if a model A zenith carb is used .

GMCPASO · 05-09-2018, 03:57 PM

I agree with all above. Bored out A manifold with Zenith A and B, Tillotson and running a Marvel. All worked well and like the Marvel right now, one with accelerator pump and one with out. All work well.

1930artdeco · 05-09-2018, 06:27 PM

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Great! I didn't think there would be a problem but just wanted to make sure. Now to find as place that can do it and then plane it.

Mike

05-09-2018, 11:31 AM	#1
1930artdeco Senior Member Join Date: May 2010 Location: Lynden, Wa Posts: 3,777	A/B manifold question I am going to get an A manifold punched for my Model B carb. I am just curious if I reattach an A carb, will it matter? Or, will the larger throat opening cause issues with turbulence and vacuum? Thanks, Mike __________________ 1930 TownSedan (Briggs) 1957 Country Sedan

05-09-2018, 01:31 PM	#2
MickeyT Senior Member Join Date: Jul 2017 Location: Texas Posts: 195	Re: A/B manifold question It won't cause any problem at all. I'm doing it right now as my B carb. is in for repair so I'm running an A carb. on a bored out A manifold

05-09-2018, 03:04 PM	#3
Herb Concord Ca Senior Member Join Date: May 2010 Location: Concord CA Posts: 755	Re: A/B manifold question Hi Mike, that what I have on my slant T/S. It's run fine for years with a Tillotson and now Marvel carbs. Make sure the shop references off the bore and not the flange.

05-09-2018, 03:53 PM	#4
Purdy Swoft Senior Member Join Date: May 2010 Location: Alabama Posts: 8,099	Re: A/B manifold question According to the Piranios dyno sheets site , a bored out model A intake manifold will help, even if a model A zenith carb is used .

05-09-2018, 03:57 PM	#5
GMCPASO Member Join Date: May 2011 Location: Paso Robles, California Posts: 75	Re: A/B manifold question I agree with all above. Bored out A manifold with Zenith A and B, Tillotson and running a Marvel. All worked well and like the Marvel right now, one with accelerator pump and one with out. All work well.

05-09-2018, 06:27 PM	#6
1930artdeco Senior Member Join Date: May 2010 Location: Lynden, Wa Posts: 3,777	Re: A/B manifold question Sponsored Links (Register now to hide all advertisements) Great! I didn't think there would be a problem but just wanted to make sure. Now to find as place that can do it and then plane it. Mike __________________ 1930 TownSedan (Briggs) 1957 Country Sedan