Holley cam 350 jet size

[XxrangeradrianxX]

I have a 83 ranger with duraspark conversion and my carb was terrible, there were missing parts on it, anyways I bought a 350 cfm and any suggestions what size jets I should put I live in Arizona where elevation is 203 ft

 

[Angie]

I am not a holley fan, however with that said, this question will depend on many factors. what internal changes have you done to the engine? is it stock? and where are you looking for your power band to flow to? What happens with the jets that it came with? does it idle correctly? does it engage in a nice acceleration now? does it bog down at any point in the power curve when you have the truck on the road? does it sputter and back fire? is your timing at 100% correct for the power band you are trying to achieve?

cheers and you tube might be worth watching some "how do i set up a carb" vids

 

[kimcrwbr1]

The auto lite 1.21 Venturi is a 351 cfm carb and does not work well on the 2.8. There is not enough air flow to vaporize the fuel properly. You can try smaller jet sizes but like was said you will likely have huge dead spot issues when you step on the foot feed quickly. Carb spacer felpro 60529 is recommended with new gaskets on either side will address any vacuum leaks.Be sure and lightly surface the base of the carb and pull it down snug. A common problem is over tightening a carb down always use new gaskets and pull it down even and snug.

 

[19Walt93]

I like Holley carbs best but 350 cfm is way more than you want on a 2.8 unless it's built up and will be run at high rpms. If you have a relatively stock 289 or 302 it would work fine.

 

[XxrangeradrianxX]

I like Holley carbs best but 350 cfm is way more than you want on a 2.8 unless it's built up and will be run at high rpms. If you have a relatively stock 289 or 302 it would work fine.

So do you think smaller jets might help because I already bought the carb I was looking online that the 1.08 Venturi is the best option but I didn’t go through with it

 

[19Walt93]

The jets need to be matched to the air flow or it'll run lean. Stick it on and drive it a little to see how it runs, then pull a couple of plugs to see what they look like. If you already own it, it's worth a shot.

 

[XxrangeradrianxX]

The jets need to be matched to the air flow or it'll run lean. Stick it on and drive it a little to see how it runs, then pull a couple of plugs to see what they look like. If you already own it, it's worth a shot.

Pull the spark plugs? If so what am I looking for?

 

[19Walt93]

The color to indicate how rich or lean it's running. Plugs used to look light gray when gas had lead in it, you're looking for a tan to light brown most likely. You can look it up on the internet to see examples. Really dark or black means you should try leaner jets, I usually go a couple sizes at a time- for example, if you have 69s, try 67s. My Mustang and truck both have Holley 80457 carbs(600, vacuum secondary, electric choke), the truck engine is closer to stock and the jets are factory, the Mustang is a little stouter and I leaned it out 3 sizes.

 

[XxrangeradrianxX]

The color to indicate how rich or lean it's running. Plugs used to look light gray when gas had lead in it, you're looking for a tan to light brown most likely. You can look it up on the internet to see examples. Really dark or black means you should try leaner jets, I usually go a couple sizes at a time- for example, if you have 69s, try 67s. My Mustang and truck both have Holley 80457 carbs(600, vacuum secondary, electric choke), the truck engine is closer to stock and the jets are factory, the Mustang is a little stouter and I leaned it out 3 sizes.

Perfect thanks for the help but I had one more question, at the moment the carb I have has an electric choke but it is not hooked up what wires do I run to hook it up on my new one

 

[19Walt93]

The Holley electric choke needs a 12v source, the hot wire on the wiper motor is easy to tap into. The original 2150 had a hot air tube running to the exhaust manifold and used stator voltage from the alternator to speed up choke opening, I think about 7 volts.

 

[Angie]

wouldn't it be better to wire an electric choke into a key on ignition only source? I actually have wired in a 4 spade plug/fuse from a relay that is wired to key on for things exactly like this.

 

[XxrangeradrianxX]

So the choke has two connections one from the alternator and the other?

 

[Angie]

black wire ground, red to Key on/ignition live. i would not wire it to alternator. Didn't a new carb come with owners manual?

 

[19Walt93]

wouldn't it be better to wire an electric choke into a key on ignition only source? I actually have wired in a 4 spade plug/fuse from a relay that is wired to key on for things exactly like this.

There's a key on source at the wiper motor that's easy to tap into but it's obviously not the only one. Wiring a Holley choke to the alternator stator terminal would cause the choke to stay on way too long.

 

[XxrangeradrianxX]

thanks guys appreciate the help