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Is this flagrant abuse of carb spacers???

Nikwho

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Okay,
First of all, I would like to say that this boat is not mine, and I'm not trash talking it at all! I've been looking to buy an old flatty v-drive. This particular boat that I've looked at has a Ford 390 FE engine. Not my first choice, but I appreciate the nostalgia of these engines.

I am morbidly curious, is this a common setup with these FE's? Or do these perform better and better the taller your stack of carb spacers get? :rolleyes:

IF I were to hypothetically pick up this boat, I was thinking that at least one layer of carb spacer would need to come off. Or, does this seem normal and is considered socially acceptable among FE enthusiasts? :D Perhaps it would get up into cooler air with some billet spacers between the carbs and scoop?

Also, while I'm prodding for Ford FE info, it seems to me that two 600 cfm cabs would be grossly over carbed for a 390" engine. Seems like something needing closer to 750 cfm worth of carb, than 1,200 cfm of carb? With all of the mildly built engines running so much carb, is it super common for all of these carbed boats to live SUPER fat?

Thanks for any insight!

Nik
 
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obnoxious001

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The racers used to do that with dual carb manifolds, look around at some of the older photos. I don't think there was a tunnel ram made for them. Not quite sure what they have going on there, but I agree it would be cleaner with the one spacer removed. It would also be interesting to run the boat before and after. In dyno testing, tunnel ram manifolds have proven to provide horsepower increases.

As to the size of the carbs, those should work correctly. You could try finding a pair of 450's if you wanted. I can't tell by the photo exactly what is on there. If the engine is tuned and jetted properly, it won't be super fat. Pull some plugs and look.
 

Nikwho

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Thanks for the info! Seemed like kind of a home made tunnel ram attempt. Then, I started looking for a proper tunnel ram for a 390 FE, thinking that an intake swap may be in order if I ended up with that boat. Then I realized that there aren't tons of options for those engines.
 

obnoxious001

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As I said, if you look around at old racing photos from the 60's, you will find that's how they did it. Lou Brummett used to run Louis Unser engines that way. That's why I suggested that you may want to retain one spacer for the old school look.
 

squeezer

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Just speculating here but there would be some tuning options with multiple spacers if the top spacer was the 4 hole type and fed to an open plenum type... The closed type might help keep the air velocity up which would compensate a bit for being over carbed... ???

(More of a question than a statement of fact.)
 

wsuwrhr

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Well...its a Ford.....so....I mean....you are surprised? :)
 

Nikwho

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Well...its a Ford.....so....I mean....you are surprised? :)
LOL. Few things surprise me. I have never been exposed to one of these FE engines. I honestly don't know what to expect. Seems that the general consensus is that this is sort of a standard setup.
 

wsuwrhr

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LOL. Few things surprise me. I have never been exposed to one of these FE engines. I honestly don't know what to expect. Seems that the general consensus is that this is sort of a standard setup.
Any engine designer that cant figure out that the component either needs to be a head, or needs to be a manifold, and not a combination of both, needs their own head examined. ;)
 

Rajobigguy

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What I used to do was too take any cheap aluminum manifold for the FE that I could find and then machine it down too accept a 351C manifold on top. that gave me a lot more manifold choices.
 
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