The guy at my local Napa parts counter told me about an intake mod you can do to improve MPG/power on the EFI 460's. At the plastic junction box in the air tubes, if you pull off the side closest to the airbox you will see two "bells" as he calls them- I would call them velocity stacks. He told me to pull them out and it should make a difference. Trouble is... they need to be cut off. Before I go nuts with my Dremel, I want to make sure this is a good idea.Click here to see pics of what I'm talking about. What are your thoughts?

 

Go ahead and cut them off it is a common mod for the fuel injected 460. They are sometimes called intake horns they are there to quiet the intake and restrict airflow. Justin

 

I'm guessing you did this mod- did you notice any difference?

 

My truck never had them in. I would get rid of them.

 

I run against the general train of thought on this one...it really depends on what you use your truck for. If your looking for maximum low end torque for pulling heavy trailer loads...then leave them on. If your looking for more top end power and low end torque is not your major concern...then take them off.
I ended up buying an un-modified air-horn and reinstalling it after running for a couple years with a modified one.
Deen

 

Deen- I was just told that this improves power and MPG a little. Since I'm in college and on a tight budget, it sounded like an easy way to up the MPG a little bit. I love the power of the truck right now, with a ton of hay in the back you couldn't even tell it was back there. How much was the air horn?

 

Go to http://performanceunlimited.com/projectmpg/ they did a lot of test on verious parts that improved performance and mpg on a 460. I beleive that with the engine mostly stock the air horns are of value but with some engine mods they become a restriction. Hope this helps some more.

 

Superduty4X4,
I found one in a wrecking yard for $20 plus shipping. It took a number of calls to locate one and finally found one in California (I live in Oregon).

kevinrf250,
I've read that article a number of times and have made a number of changes identical to what they recommended. Cutting the ends off the snorkel does make a differance from 3000 to 3200 RPM and up...trouble is I spend 99 percent of my time below 3000 RPM. Towing at 60-62 MPH my tach reads 2750 RPM. Also, I could not smoke the tires from a dead start even when I switched to 4:10 gears (no power-braking). I tried changing timing, full tune-up, etc. but still could not spin the tires. As soon as I received the stock snorkel from the junk-yard I went out and tried it and can easily smoke the tires at will now (no other changes were made). The down-side is I noticed the engine does not pull hard above 3800-4000 RPM where it pulled to 4500 RPM with the modified snorkel. So it all goes back to what YOU are looking for...if you want to Hot-rod then modify the snorkel....if you tow heavy loads (5000 lbs. or more) and cruise below 3000 RPM then leave it stock.
Deen

 

My truck never had the air horn in it and if the previous owner ground it out they did a great job, I wonder if some 460's came with out the air horns?

 

Thanks again Deen. I'm contemplating buying a Banks Stinger kit to help the MPG out. I'll check out that article and then decide what I want to do, but it sounds like I'll be keeping the stock setup.

 

I would be carefull when buying the banks stuff. It seems to be over priced for what you get. But they do make quality stuff.

 

My 93 doesnt have the air horns. It may be a pre 93 because the heads and throttle body changed in 93.

 

My 93 doesnt have the air horns. It may be a pre 93 because the heads and throttle body changed in 93.

 

kevinfr250- the Banks Stinger kit is a cat back exhaust with a ram air intake/lifetime air cleaner. It runs about 580 bucks, which as far as I can tell is roughly as much as an exhaust/intake setup would be if I purchased the two seperately. The PowerPack, OTOH, comes with headers and a Y-pipe in addition to the Stinger kit stuff, but runs over 2 grand!!! IMO, the Stinger seems to be a good value, but the PowerPack is overpriced for what you get.

 

If you went to an exhaust shop and had them do an cat-back exhaust and then boght a K&N drop in filter it would be the same as the banks kit and most likely half the price. The air intake that they have is nothing more than a replacement lid for the stock air box. It seams that you could modify the stock one for a little more flow. For the exhaust just have a 3" pipe put on after the cat, you don't need a muffler for it, the stock cat muffles the sound pletty. This is how my truck was before the headers. You could do all this for $200 dollars or less and have the same performance increase as the banks kit. This is just my opinion, but I would not waste my money on the banks stuff.