The Ford Barn

dynaflash_8 · 02-18-2024, 07:55 PM

I put a new motor in my model a, and somehow ended up with a pair of holley model 92 carbs, which are the holley version of the famous stromberg 81 carbs. I can't find any information on them, especially regarding stock power valves or jet sizes. I plan on running them on a gear drive intake on a pretty hopped up banger.

Anyone have any information regarding these oddball carbs? They are ford script, manufactured by Holly. Model number is 92 (cast into the side), and have an 81 cast into the rear of the carb.

alexiskai · 02-18-2024, 09:35 PM

The Holley 92 Venturi size is 0.875 and it flows 142 CFM. The stock jets are .043. For power valves I've heard 7.5 as stock, but also folks have mentioned using 6.5, 5.5, and 4.5. This is all secondhand info from the internet but that's what I got.

Jim Brierley · 02-19-2024, 02:05 PM

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Holley carbs, in general, need smaller than stock power valves when used in multiples. The reason is when in pairs, or more, the manifold vacuum drops quicker than as a single carb, so makes the mixture richer than ideal.

02-18-2024, 07:55 PM	#1
dynaflash_8 Member Join Date: Jul 2011 Location: Auburn WA Posts: 73	Holley 81 v8 60 carbs I put a new motor in my model a, and somehow ended up with a pair of holley model 92 carbs, which are the holley version of the famous stromberg 81 carbs. I can't find any information on them, especially regarding stock power valves or jet sizes. I plan on running them on a gear drive intake on a pretty hopped up banger. Anyone have any information regarding these oddball carbs? They are ford script, manufactured by Holly. Model number is 92 (cast into the side), and have an 81 cast into the rear of the carb.

02-18-2024, 09:35 PM	#2
alexiskai Senior Member Join Date: Apr 2018 Location: Mebane NC Posts: 2,355	Re: Holley 81 v8 60 carbs The Holley 92 Venturi size is 0.875 and it flows 142 CFM. The stock jets are .043. For power valves I've heard 7.5 as stock, but also folks have mentioned using 6.5, 5.5, and 4.5. This is all secondhand info from the internet but that's what I got.

02-19-2024, 02:05 PM	#3
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,089	Re: Holley 81 v8 60 carbs Sponsored Links (Register now to hide all advertisements) Holley carbs, in general, need smaller than stock power valves when used in multiples. The reason is when in pairs, or more, the manifold vacuum drops quicker than as a single carb, so makes the mixture richer than ideal.