Dauntless cams/4bbl carbs

I'm going to rebuild my spare :v6: over the winter and replace the tired one in the Jalopy. I'm looking at putting a cam in that gives more low end torque and thinking about this one: http://www.summitracing.com/parts/CCA-63-234-4/ Is this a good cam for what I do with my Jeep which is strict off roading?

Summit also has some others, but their RPM range is 1400-5800.

Also, another quick question, I'm going to upgrade to a 4 bbl intake, so which carb would be a good combo with the cam?

 

Holley TA470
I have one on mine & it works really well off-road. I had to do a lot of adjustments to get it to work good, but I'm at 6500 ft elevation. I think that it would probably work with just jetting changes at your elevation.

 

Thanks guys, I can feel my wallet getting thinner and thinner.

 

I run a Holley 390 on a Offy Dual Plane. The 390 (4160/8007) ran great out of the box. I've since made most all of the modifications that are on the TA with great success.

I may still be a lone voice here but I just don't see the point in putting a 470 CFM carb in an application that will never see that kind of flow. I generally run from 1500-2000 RPM on the trail.
I would be pleased to hear any reasonable discussion about this.

 

The main argument against the 390 vs. the 470 is not the sizes of the two carburetors. The 390 should be plenty of carburetor for a 225. Most people would consider the 470 TA (Truck Avenger) a better off-road carb, and the 470 TA is not so large that it won't work on the 225. The TA also has annular booster venturis, which help to boost vacuum signal, letting this somewhat oversize carb work well on a 'too small' engine.

In my experience, the Holley street carburetors (2300 and 4160 types) don't work very well on the trail without a lot of modifications. The TA carbs are said to work well for trail use right out of the box. They already have the usual trail modifications that are needed to give the street Holleys acceptable trail performance - raise the bowl vents, spring loaded float, vent baffles, lower float levels, extended jets - there are likely more that I don't recall).

Look at the CFM ratings of throttle bodies (TBs) used for electronic fuel injection (EFI). Typically their CFM ratings are huge compared to carburetors intended for similar sized engines. This is because EFI only measures the vacuum signal, it does not use it to do work. This means that the VE (volumetric efficiency) of an EFI'd engine can be quite a lot higher than a carbureted engine, providing higer power output without sacrificing economy. So higher VE is advantageous, as long as you can keep the fuel under control. Go too big on a carb, and it will only run if you set it up very rich; not good. But the 470 TA is not too big on a 225, from what I've heard.

If you're running a 390 CFM 4160 on a Jeep without any mods, I think you're the exception to the rule. Certainly you want the 4160 with side-hung floats rather than the 4150 with center-hung floats. But IMO the 4160 v. the 4150 is just the lesser of two evils.

 

^What Tim said.
Also, supposedly Holley made internal changes in the metering blocks to improve off road capability. I can tell you that I deliberately ran my Jeep uphill, downhill, and "sidehill" as much as I dared to and the engine purred like a kitten. As far as the 470 being too big for the 225-it's a vacuum secondary carb, so it won't open up the back barrels unless the engine demands it. I have no doubt that 90% of the time I'm running on the 235 CFM of the front barrels, but it does have better power and throttle response than the old 2G carb.
Also, a small point of clarification-the TA 470 IS a model 4150. The 4150 series have rear metering blocks, and the 4160 have a rear metering plate (the rear fuel bowl bolts directly to the main body). Depending on the application, the 4150 can have either center hung or side hung fuel bowls.

 

I was thinking about doing the same thing to my 225 and is the 252 cam better for torque than the 268 cam???? My Jeep will be 50/50 off road/ local driving .....I may drive it to work a little

 

The cam I posted in the opening post has the lowest RPM range (1000 - 4800), so that means it has more low end torque. The others are between 1400 and 5800 rpm.