EFI TO CARB
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Senior User
Joined: May 2009
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From: Albany OR
EFI TO CARB
Today i pulled my 460 from my 93 f-250 4x4 to do a rear main seal an to do a top end job. When i taking off my oil pan i was looking in the bottom of the pan a found a piece of a piston skirt. Since my truck is going to be down for a while i thought of going form efi to carb since i have my engine out. What thing would i run in to doing this i know i would need new intake heads an a carb what els would i need an what problems would i run in to? One thing i thought was since i have a e4od it req the computer to shift unlike the c6 which is vac controlled to shift am i right on this being a problem?
Post Fiend
Joined: Mar 2004
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From: Union, Washington
You can keep the EFI heads and intake. You will get the adapter plate from pricemotorsports.com - Allows you to bolt a carb directly to the manifold after you take off the throttle body. You also have to change out your ignition to a duraspark or any other non-computer controlled unit. You will have to do some wiring work to find your appropriate leads to your ignition. You also have to swap in a low pressure fuel pump but I have seen some avoid this with some simple plumbing. You can search for that.
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Senior User
Joined: May 2009
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From: Albany OR
Ok bear sounds good to me it will fix my truck till i can get the money to put a better intake an heads. But my big question is my transmission will it work with my idea of using a carb. Since the transmission is controlled by a power source not by vacuum. An how bad of mpg will i get by just using stock cam/intake/heads? Is there any one that has done this that can give me info on how there truck ran?
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Can't tell you about mpg. But to make your auto shift properly adapt your present TPS to the carb and your trans should shift properly. Otherwise you have to buy a standalone tanny shift controller.
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Senior User
Joined: May 2009
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From: Albany OR
I was looking at a post on here about a efi build i did not know they had cams an other thing for efi systems so i am think about staying with efi it is just kind of hard to get good power an lower my price i pay per gallon since i usually run 92 gas. But my big question now since i got in my head what i really want now an is possible dose any one make a chip for a speed density 460? An what r the benefits of going maf?
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Joined: Jun 2004
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From: Edmonton, Alberta Canada
another option is Price Motorsports is now making adapters to mate standard carb intakes to the EFI heads, so you can bolt most aftermarket intakes to the factory efi heads. opens up a whole bunch of options for people who want a better intake but keep the efi heads.
the big problem with speed density is that you can't vary much from stock specs (ie cam, compression, exhaust) and still get the computer to run the engine properly. i am not aware of anyone making a chip for te 460efi, but haven't looked that much. the Mass air system is best if you plan on doing a cam swap, headers, more compression, headers, exhaust, etc as the computer will compensate better for these modifications on its own. plus there is a lot more systems out there for maf.
rgds
Mike
the big problem with speed density is that you can't vary much from stock specs (ie cam, compression, exhaust) and still get the computer to run the engine properly. i am not aware of anyone making a chip for te 460efi, but haven't looked that much. the Mass air system is best if you plan on doing a cam swap, headers, more compression, headers, exhaust, etc as the computer will compensate better for these modifications on its own. plus there is a lot more systems out there for maf.
rgds
Mike