300 build
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300 build
Im going to start a mild build to my 300 ci motor here soon and need some tips on certain parts I should use. I would like to get more HP out of the motor to push 33's real nice but don't want to put bookoo's of money into it. Can I just buy a master rebuild kit and maybe put headers, intake and 4 bbl carb on it. The motor needs to be rebuilt anyways as it was not well taken care of from previous owner. This is my first engine rebuild so I'm not sure what parts I should use whether it be a bigger cam or different head I'm just not sure. If anyone has built a 300 I would like to know what parts would work best and where to get them as well. Also I have a 4 SPD mt with hwy gears and would like to know where I could find a granny low tranny with transfer case. The current transfer case is a NP 208.
Hotshot
Joined: Jul 2002
Posts: 14,285
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From: Bend,OR
what year is all this in?
there are a number of 300-6 specific forums where guys are putting out good power from that motor. doing it cheap is the challenge for most. Cam, header, intake + 4brrl will be a must. Your still going to need gears in the front/rear diff regardless to compensate.
there are a number of 300-6 specific forums where guys are putting out good power from that motor. doing it cheap is the challenge for most. Cam, header, intake + 4brrl will be a must. Your still going to need gears in the front/rear diff regardless to compensate.
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Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
Check out the 300 six specific forum:
Ford Inline Six, 200, 250, 4.9L / 300 - Ford Truck Enthusiasts Forums
The nice thing about the 300 is that it's so restricted stock that it doesn't take much to wake it right up.
Intake:
Offenhauser C or DP, or a Clifford intake.
A mid-small 4bbl. I'd recommend a 465cfm Holley or a 500cfm Edelbrock.
The 390cfm Holley will also work well.
You CAN use a 600cfm (I have one on one of my 300s), but they're a touch big and you start to lose some low end. But, they work, and can work well.
Exhaust: Headers are good, but you can also suffice with some manifolds from an EFI engine. They're robust, cheap, made by Ford, and offer a great improvement over stock.
Run a 2.5" single exhaust out the back.
The NP435 is the transmission you're looking for. They're super robust, so often just finding one in a junk yard (most often behind a 300) and filling it with fresh oil is about all you need. Note that you'll need a different floor pan and floor mat as the hole placement for the shifters are in a completely different places. That SROD aluminum highway transmission that's in there now is a piece of junk.
New Process 435 (Rebuilt) Transmission-Broncograveyard.com
(They have their info wrong on the years. They used them until the mid-late 80s)
For 33" tires and a non-overdrive transmission, you'll probably want to stick with 3.50 gears front and rear. That'll put you around 2100 RPMs @ 60mph and give you plenty of oomph. If you're more into off-roading and don't plan on much highway, go with 4.11s.
If you change your tires and gears, be sure to reset your speedometer. It's cheap and easy to do.
If you're rebuilding it, look into a performance cam. A Comp 260 is a common choice. The 252 is more for a mild/econo build, and the 268 is more for a higher HP/aggressive build, so pick your end of the spectrum.
If you want to put a bit more into it, install oversized valves and get the head port and polished.
You'll have plenty of engine after that.
Ford Inline Six, 200, 250, 4.9L / 300 - Ford Truck Enthusiasts Forums
The nice thing about the 300 is that it's so restricted stock that it doesn't take much to wake it right up.
Intake:
Offenhauser C or DP, or a Clifford intake.
A mid-small 4bbl. I'd recommend a 465cfm Holley or a 500cfm Edelbrock.
The 390cfm Holley will also work well.
You CAN use a 600cfm (I have one on one of my 300s), but they're a touch big and you start to lose some low end. But, they work, and can work well.
Exhaust: Headers are good, but you can also suffice with some manifolds from an EFI engine. They're robust, cheap, made by Ford, and offer a great improvement over stock.
Run a 2.5" single exhaust out the back.
The NP435 is the transmission you're looking for. They're super robust, so often just finding one in a junk yard (most often behind a 300) and filling it with fresh oil is about all you need. Note that you'll need a different floor pan and floor mat as the hole placement for the shifters are in a completely different places. That SROD aluminum highway transmission that's in there now is a piece of junk.
New Process 435 (Rebuilt) Transmission-Broncograveyard.com
(They have their info wrong on the years. They used them until the mid-late 80s)
For 33" tires and a non-overdrive transmission, you'll probably want to stick with 3.50 gears front and rear. That'll put you around 2100 RPMs @ 60mph and give you plenty of oomph. If you're more into off-roading and don't plan on much highway, go with 4.11s.
If you change your tires and gears, be sure to reset your speedometer. It's cheap and easy to do.
If you're rebuilding it, look into a performance cam. A Comp 260 is a common choice. The 252 is more for a mild/econo build, and the 268 is more for a higher HP/aggressive build, so pick your end of the spectrum.
If you want to put a bit more into it, install oversized valves and get the head port and polished.
You'll have plenty of engine after that.
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Kuskoal
Ford Inline Six, 200, 250, 4.9L / 300
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