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Carb intake on an EFI 300?

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Carb intake on an EFI 300?

Post #1 by jdaum1222 » Wed Jan 10, 2018 3:43 pm

Hey y'all,

As with the rest of us, I'm looking for more "oomph" outta this engine. I've found tons of stuff online about turbocharging with an HX-35, but more recently supercharging with an Eaton M-90 off of a Ford Thunderbird. I think supercharging would be a better application ford this engine because of the low rev range and immediate boost instead of having to really rev it up for a turbo.

I am in the conceptualizing stage of my potential build, but am having issues figuring out how to get the air from the supercharger into my engine due to the stupid design of the EFI heads (with the lower elbow into the overhanging upper into the throttle body). Has any body done a similar build?

That being said - my true question is: Is it possible to swap the intake from an EFI 300 to an Offenhauser or similar while keeping the EFI system "stock-ish"?

Any and all feedback is appreciated!

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Re: Carb intake on an EFI 300?

Post #2 by THE FRENCHTOWN FLYER » Wed Jan 10, 2018 5:32 pm

I think the newer Offy intakes - or is it Clifford??? forgot - have bungs that can be machined for injectors. Having said that, there are other things that will need mods, and the positive pressure at boost means the EFI will have to be tricked up or replaced by an aftermarket system.

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Re: Carb intake on an EFI 300?

Post #3 by Fordman75 » Wed Jan 10, 2018 7:12 pm

I've done a whole lot of thinking and research on the Eaton superchargers. I feel the M90 is too small for the 300. The Cobra M112 is a better choice unless you want to run dual M90's. I've even had a GT500 H122 that I was going to use on a 300.

You could use the stock lower intake and build a new upper intake plenum. That would allow you to lay it out how ever you wanted. On mine I was going to mount the supercharger/s on the fabricated bracket on the driver side of the engine. Run the air charge into a front mounted intercooler. And then up to the intake. But I'm a carb guy so I was going to use a blow thru carb set up on mine. But life got in the way so I scaled my plans back to multiple carbs, big cam and high revs. :lol:

54 Ford F100/F150 4x4
300, NP435 4spd, NP205 transfercase

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Re: Carb intake on an EFI 300?

Post #4 by Harte3 » Wed Jan 10, 2018 8:20 pm


The folks that haunt that Forum can probably be quite helpful...
'83 F150 300, 0.030 over, Offy DP, Holley 4160/1848-1 465 cfm, Comp Cam 260H. P/P head, EFI exhaust manifolds, Walker Y Pipe, Super Cat, Turbo muffler, Recurved DSII, Mallory HyFire 6a, ACCEL Super Stock Coil, Taylor 8mm Wires, EFI plugs.

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