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240/300 Log Intake 1bbl to 2bbl Modification

Moderator: Mod Squad

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old28racer
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240/300 Log Intake 1bbl to 2bbl Modification

Post #1 by old28racer » Sat Jun 27, 2020 7:49 pm

Thought I would start a new thread on this project and get off another members Holley 5200 thread. This whole project is to improve on mileage in my 1971 F250 300 with a current stock style rebuild, headers, dual mufflers & tail pipes.still has P&C dizzy (Pertronix Ignitor coming), C4 trans, 3.73 rear gears, 30" tires. Truck has a wideband AFR gauge mounted onboard. Fun project to work on.

Well guys I have finally got my milled out 240/300 log intake done. I am going to install it next month if my health goes along with time table. Picture shows it on my shop 300 build, but it will go on my 1971 F250 300 4.9L inline 6. In the picture it has a Autolite 2100 fresh rebuilt carb but I will be trying the intake with my current Holly 2300 350 cfm carb first. No carb or ignition changes and will get a new AFR to compare with the existing AFR baseline. Then with the 2100 & last with the 5200 carb.

I am hoping that the 240/300 log 1bbl intake opened up to except a 2bbl with better air flow will lean out my existing AFR a bit over current setup with a very restrictive 1x2 carb adapter. Will not make any jet changes until after I get new AFR baseline.
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Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

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bubba22349
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Re: 240/300 Log Intake 1bbl to 2bbl Modification

Post #2 by bubba22349 » Sat Jun 27, 2020 8:06 pm

Old28racer looks to be a nicely made adapter plate mount on the modded stock intake. Going to be a real clean install. :thumbup: :nod:
A bad day Drag Racing is still better than a good day at work!

I am hunting for a cheap project car to build up. My Ex-Fleet of Sixes sadly these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

Broncomike
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Re: 240/300 Log Intake 1bbl to 2bbl Modification

Post #3 by Broncomike » Sat Jun 27, 2020 9:48 pm

Agreed, looks like great work. I'm looking forward to your test results, im ordering rebuild kits for a similar test between a 2300 and 2150 1.21, although my 2300 is an older 275cfm version and I picked up a damaged offy C intake cheap that I'm repairing. I'm going to use an HD exhaust manifold and a single 2.5 or 3in exhaust though.

What kind of mileage were you getting before and what are your expectations? My 1965 F250 would get 19mpg on costal drives with a 50mph speed limit and 16mpg at 60mph on the highway. That was with a carter, 4.10 gears and 235/85r16 tires.

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old28racer
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Re: 240/300 Log Intake 1bbl to 2bbl Modification

Post #4 by old28racer » Sat Jun 27, 2020 11:31 pm

bubba22349 -- Thanks for the nice comments, the bottom adapter I got from BlairsvilleEd on this this site, it is drilled & taped for a Holley 5200 carb & I used the holes to mount my 2300 & 2100 carb adapter, home made adapter plate, little ruff but acceptable. I am going to change the vacuum system & use the right port for my power brakes & run a 90 elbow to have vacuum tree head to back of the motor. Think it will look a lot cleaner.

Broncomike -- That 2150 is a much more tunable carb than the 2100 I have. One nice thing about both is that they are the easiest carb to rebuild & the best 2bbl Ford ever make. That Offy C with a 4x2 adapter will make a sweet setup. A buddy of mine just gave me a sweet Clifford 4V with a 4x2 adapter included so I will be trying both the 2100 & 2300 on that intake at some point in my tests.

The main problem with the Ford 300 head is they do not flow very well without some nice P&P work, and I am not doing any P&P on my F250 motor. As I said on a different thread my truck gets 15-16 mpg on a freeway trip at 50-60 max and with my 1x2 adapter in the flow system that's not all that bad. My main problem is my around town 35-45 mph mileage is real poor at 8-10 mpg.

I am looking for better things from my "backyard mechanic" intake mod, but I know it will flow better than through a 2x1 adapter. The other big problem is that my 2300 is rated at 350 cfm with 62 main jets, say it is only flowing 300 cfm I should be running 53 jets, and I don't think it is flowing 275-285 cfm as it is now.

I have lots of combination to try & some carb re-jetting to work on.
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old28racer
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Re: 240/300 Log Intake 1bbl to 2bbl Modification

Post #5 by old28racer » Sat Jun 27, 2020 11:40 pm

Broncomike -- In answer to the rest of your question, If I could get 18-20 mpg highway @ 50-60 max and 12-13 mpg in town @ 35-45 I would be real pleased with the mods. Sure glad I installed a wideband AFR gauge in the truck, ain't smart enough to tune it the old school ways.
Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

Broncomike
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Re: 240/300 Log Intake 1bbl to 2bbl Modification

Post #6 by Broncomike » Sun Jun 28, 2020 1:29 am

What AFR setup are you using? I've been looking at them online but am having a hard time deciding what to get.

BigBlue94
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Re: 240/300 Log Intake 1bbl to 2bbl Modification

Post #7 by BigBlue94 » Sun Jun 28, 2020 12:43 pm

Broncomike wrote:What AFR setup are you using? I've been looking at them online but am having a hard time deciding what to get.


Im running one from AutoMeter in mine. Works great. I was able to watch my AFR lean out coming home from the Rockies. Tuned for 9000', I made it to 3000' before leaning completely out at 17.5:1. At this point, i had to give it a lot of throttle just to do 60 on the highway. Swapped jets, and was good to go back home to 1000'.

Others like the one from innovate motorsports.
1985 Bronco. 309ci I6, NP435, 4.56 gears, Detroit locker and tru-trac, 4" lift, and 37" swamper tires. The 309 is 9.75:1 CR with a Schneider 140H cam, 4bbl, roller rockers, larger valves, and headers.

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old28racer
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Re: 240/300 Log Intake 1bbl to 2bbl Modification

Post #8 by old28racer » Sun Jun 28, 2020 3:58 pm

Broncomike -- I am running a wideband AEM 30-30-4110 with a Bosch 4.9 sensor, it was $76. Have used it for almost a year with no problems. Lots of good units out there from $50 to $175 and more. Just be sure you get a "wideband" unit.
Bad Day Racing Is Better Than A Day In The Stands :mrgreen:

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