How to select proper carb

B

brad bedell

New member
Hello, I need some help determining what would be the proper carb to use for my motor. I have an .020 overbore on a reletively stock rebuilt 392. It has a dui ignition, rpt square bore aluminum intake with an rv cam, and 2 into 1 out a 3" exhaust. I live at 5500 feet and rarely go below that altitude, usually higher, up to 11000. This is in a Scout 800 with an automatic 727. It has 32" tires with 3.55 gears (4.11ish in the future). Please keep in mind, with the 392 and a 3/4 phenolic spacer, my air cleaner to hood clearance is quite minimal... I really do not want an automatic choke as I have had horrible luck with them in the past! All help is sincerely appreciated! I am leaning towards the edelbrock as currently there is a carter on it, then I would have to change around fuel lines, kickdown etc...

Thank you,
brad
 
My preference and a pair of mixers I use all the time,...a Holley 1850 manual choke or a Holley 80457 electric choke. I only use electric choke systems in the conversions I do for folks here.

The 1850 and the 80457 are virtually identical setups out of the box, the 1850 is a bit fatter but either will need to be jetted for your actual application anyway.

The "overbore" on your engine is inconsequential and has nothing to do with this selection.

You cannot use any Holley 4v carb with a centerhung fuel bowl system on an IH sv engine due to thermostat housing and waterneck interference.

See this thread for setup information:

http://www.forums.IHPartsAmerica.com/carb-tech/76-beer-can-maneefol-guapo.html
 
Well thank you for the quick response. Clearly you are the person everyone wants to hear from, and I too will adhere to your advice. Sure do like that air-cleaner set up, and tho I haven't read the post thouroghly (as of yet), do you know what the overall height is? From carb base to top.

Thanks again!
Brad
 
If you decide to do the Holley, then I can give you more exact details regarding overall height of the air cleaner/carb/insulator stack that will fit under the scot II hood without the need for a body lift.

Actually, if you decide on an edelbrock, the overall "stack" is near identical to the Holley setup.

I simply prefer the Holley modular carb for this app since I feel it's infinitely more tunable than any other unit. And we have the experience with that setup as you can see. However, the edelbrock can certainly be tuned to perform just as well.

I'd highly encourage ya to use the full electric choke though, with a properly dialed-in setup the cold starting is near identical to any modern fuel injection vehicle.

Your operational altitude (good point that you mentioned!) presents a bit of a challenge but nothing that can't be worked out! I feel for meeting the conditions of a wide range of elevation differences spread over time, the Holley is an easier animal to deal with though!

Think this over, we'll certainly help ya make either carb selection work!

By the way, after providing that link to my own rpt manifold install, I realize it's more than a year since I updated it! And the carb setup has changed a bit since then as I've tried to optimize this system for use with this dam e10 fuel.. And just a few weeks back I made more changes so I need to update that thread, jetting has changed again a bit but that is more because I dial this stuff in ragged edge and I can't keep my hands off my own junk!
 
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