Hey gang, new guy here, just bought an 84 f150 4x4 with 4.9 300, 4 SPD to use for hunting, dump runs and tinkering with! Also own a 2003 f150 4x4 with 5.4. Just wanted to say hi and I'm looking forward to all of this knowledge on the forum

 

I don't bring any knowledge, but I do bring a warm greeting: Welcome to FTE! From everything I've heard you'll like the big 6.

 

Thanks......

 

Welcome to the forum!!! Gotta love the 300 6!

 

Dont listen to Gary. He is one of the most experienced people here.

Welcome

 

You'll like the 300! Don't rev it over 3000 rpm and you'll love it. It's a very low rpm motor that has the same power output as a 302, but at a lower rpm. Max torque is 255 ft-lbs (if I remember right) at 1400 RPM. They can be built and made to rev like a 302 if that's what you want, but it's more expensive. Think of it as a 302 with 2 less cylinders. It's perfect for off-road or daily driver use.

My old worn out 300 doesn't like to get over 2000 RPM, and you have to really push it to make it do it when out on the road. This is with it tuned to the max and the timing set to run the most initial timing it can run. But oh man, if you're at low speeds, starting off, or off road, you can punch it and you really feel the torque.

You'll want to see about a Duraspark II swap to make your motor run correctly if the factory ignition and smog control equipment has been chopped up. Your 84 was originally computer controlled. The computer controls the timing and fuel mixture, and if something happens with the emissions equipment, it locks the timing and sets the motor to run rich. Just good enough to get you home. MPG and power will both suffer when it's like this, and it is readily apparent when it's in "limp home mode". The 300 is very tolerant of this, and will often run "just fine" to the people who don't know anything is going on. The major indicator is poor gas mileage. Think 10 to 14 mpg.

Good luck, and stick around, you'll be able to learn every minute detail about your truck if that's what you want.

 

Thank you. But, please help me understand why you don't want him to listen to "one of the most experienced people on here"?

 

Thanks guys, I am definitely going to look into the duraspark II. Does the carb need to be a non feedback with that ignition?

 

The carb doesn't need to be non feedback, but if the computer has been neutered by someone taking off some of its inputs or outputs then it isn't going to be controlling the carb. The computer was able to change the air/fuel ratio over a very narrow range via the feedback carb. But, unlike the DS-III ignition system, the carb will still function pretty well w/o the computer's help. So it isn't a requirement to change it out. Some have reported better MPG or drivability when they changed it out, but others got along just fine w/o changing. Since we really don't know whether the original carb needed rebuilt, it is possible that swapping it out for a rebuilt one was what improved things.

 

Thanks Gary