390 cam question
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Senior User
Joined: Dec 2005
Posts: 348
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From: Hemet, California
390 cam question
Ok been reading through here and have seen the 343901 is a good cam. I'm running a 390 .030 short block with 428 heads, a performer intake, edelbrock performer 750 in a 75 super cab long bed with exhaust exiting behind the passenger rear and a 2 chamber flowmaster. Looking for a decent cam for towing and umph. It will be lifted on 35's. Will this cam be a good fit for this setup? Everything other than what I've listed is stock (manifolds, rockers etc). Looking for at least decent driveability. Truck also has factory ac
Mountain Pass
Joined: Apr 2014
Posts: 112
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From: SW Idaho
Headers will be a big help. Long tube is better for TQ. Maybe a 600 or 650 CFM carb will help with the pulling power over the 750.
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Senior User
Joined: Dec 2005
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From: Hemet, California
C/R? I have been looking at headers for it. Pulled motor to change freeze plugs, seals and gaskets and to check bearings. Wasn't going to change the cam but I noticed 4 of the lifters were hammered so new cam is a must. Low mileage but sat for about 8 years. Looking like I need to sell this carb though.
Lead Driver
Joined: Nov 2006
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From: Pa.
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From: Hemet, California
Lol I feel retarded. Honestly I don't remember. Engine was put together in 05 then sat. I'll check the gear ratio tonight when I get home. I just barely started driving the truck again
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Senior User
Joined: Dec 2005
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From: Hemet, California
I'm looking to make this truck dependable but better than stock. Was looking at cam 332063. I don't want to change valve springs, figured this would be a good cam. As for headers what do you guys recommend? It's a 75 F-250 Ranger with column shift, Factory A/C, Power Steering, Power Brakes. I want to be able to hop in it, tow an empty trailer to say Pahrump NV and tow a car back to Southern California if I had to. This scenario wouldn't be a regular one but I want it to be a possibility. What would I need to do to this carb to make it work? Truck will also be dyno tuned when put back together
Mountain Pass
Joined: Apr 2014
Posts: 112
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From: SW Idaho
The carb you can not change how many CFM's it will flow. Maybe someone on here would buy it from you or maybe a local speed shop or racer will? That's the same cam I'm going to run in my 390. To tell you the truth I'd pull the heads and have them set up right for the cam. It's boarder line to run with stock springs. That's from comp and two different machine shops I have used for 25 years. For me, the price of a hook or springs. If you are in no mans land the hook is not going to be cheap.
Just my $.02 worth.
Just my $.02 worth.
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From: Hemet, California
Good point NFK, I just found out I have more of a budget so springs it is regardless lol. This started as a freshening up with new freeze plugs and seals and is now- new cam lifters, springs, headers, heater core, power steering pump, A/C condensor, drag link, tie rods, distributor etc... Said screw it for what it would cost to buy a new F-250 I can restore this one and no smog hassle
Lead Driver
Joined: Nov 2006
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From: Pa.
You still didn't mention your gear ratio .. If your running 3.54's or 3.73's and are planning on running 35 inch tires your asking a lot from that 390 especially with A/C and a Auto trans in a towing scenario .. I'm running a 600cfm holley on my 390 and tow with it some and I'm at about 1100 ft. in elev... When I lived in Colo. @6000 ft. I was running a 390 with a 650 cfm carb and 4.10's .. Both motors had headers, pre emissions timing sets, and torquey cams .. I found in Colo. if I was towing in the mountains above 5000 elev. I needed a 750 cfm carb and even then that 390 was working hard .. Building a 390 tow motor that will run on 87 octane fuel is a challenge and cost some dollars @ the end of the day ..