Will this carb work on my flathead??
Mountain Pass
Joined: Sep 2010
Posts: 184
Likes: 0
From: Oconomowoc, WI
mileage
Mileage is based much more on cam than carb. The carb relys on vacuum to create a pressure drop across the venturi in the carb. The pressure drop allows fuel to meter through the jets to provide the correct air / fuel ratio. If you are looking for a good carb the holley is a good one.
IF
1. all the vacuum lines are hooked up to the appropriate places.
2. no internal passages are plugged
3. the proper jets are installed
4. you have a carb that is not internally worn out (throtle plate shafts, accelerator pump bore etc).
I would think a 600 CFM rated carb would be plenty for a flathead.
IF
1. all the vacuum lines are hooked up to the appropriate places.
2. no internal passages are plugged
3. the proper jets are installed
4. you have a carb that is not internally worn out (throtle plate shafts, accelerator pump bore etc).
I would think a 600 CFM rated carb would be plenty for a flathead.
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Senior User
Joined: Oct 2003
Posts: 291
Likes: 0
From: Oregon
Actually, I was trying to be funny. It is an absolute correct carburetor (Holley stamped Ford numbers on it at the factory in addition to their own list number) for a 1969 Shelby GT500. It is rated at 735 cfm, at home on a 428 CJ, probably a bit much for a flathead. I'm going to be restoring it over the next couple of days.
A better picture would show it has 1.625" venturis, both primary and secondary. You ought to see the size of the fuel pump I will be refinishing for it.
A better picture would show it has 1.625" venturis, both primary and secondary. You ought to see the size of the fuel pump I will be refinishing for it.
Fleet Mechanic
Joined: Mar 2010
Posts: 1,342
Likes: 1
From: Jamestown, IN
So will putting dual carbs, or a 4 barrel on my flathead increase my horsepower if i do NOT mess with my cam?
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From: Oregon
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Fleet Owner
Joined: Jul 2004
Posts: 27,294
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From: NM
Flat V8's are breathing-limited. The carb is just one part of the restriction. A good porting job on the block will help. The exhaust will help. But for street use, don't expect miracles, it's only 239 c.i. with 6.8:1 compression. The 4-bbl is less trouble with linkages and probably better mileage (running on primaries most of the time). Duals have undeniable cool factor, tho.
Fleet Owner
Joined: Jul 2004
Posts: 27,294
Likes: 1,055
From: NM
With no other changes? 10 HP at the most, IMO. You'd be limited by the stock ignition, low compression, the stock exh manifolds...You'd undoubtedly boost the bottom end noticeably, and that's where flatties excel anyway. I'd be interested what other flathead folks think...
PS -- most "100 HP" (8BA) flatheads make about 80 - 85 HP in real terms (dyno)
PS -- most "100 HP" (8BA) flatheads make about 80 - 85 HP in real terms (dyno)
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Senior User
Joined: Oct 2003
Posts: 291
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From: Oregon
Could get yourself some EAB (52-53 Ford car) heads for a bump in compression. With dual deuces, you will need a different distributor, such as a modified chebby. The stock Load o matic may not get the vac. signal from twice the carbs. I can't speak as to how the stocker works with a 4V.
