Engine Putting a Holley 390 back on the Clifford

[JeepinMike]

I recently bought my old 1985 Jeep CJ7 back that I owned in 1998. Since selling it in 2003 the only things that were changed were the seats and the carburetor! It originally (1998) had a Holley 390 and ran great so that's what's going back on. I have a few questions that maybe some of you can answer that have similar setups.

1) Is there a right or wrong orientation to mount the carb to the intake? Pic 3 shows how it was mounted originally.

2) Is there a throttle bracket that works with the Holley and the Clifford? The one in pic 2 seems to have interference with the acc pump lever even though it seems to be part of the original setup. Don't like the need for extra gaskets.

3)What are the threaded holes on the bottom of the intake (directly below carb) for? Heater? My intake is NOT water jacketed. It's at least from 1995 or earlier.

4)Electric choke power feed....there is a female flat blade plug with red and red w/ white stripe wire near the brake booster. One of the wires has continuity with a wire on the oil pressure switch. Is that the original choke hookup?

5) Any other tips for setting up this carb?

 

[Manic Mechanic]

That's on backwards. It should be facing the other way and fuel entering from the front.

I was running a MC 2100 (similar 2 barrel) now I have a Holley sniper EFI

Sorry for the poor pictures

 

[JeepinMike]

That's on backwards. It should be facing the other way and fuel entering from the front.

I was running a MC 2100 (similar 2 barrel) now I have a Holley sniper EFI

Sorry for the poor pictures

What effect would spinning it 180 have? If anything I've seen pictures of them mounted sideways, which I would do if I had more room (brake booster)

If I did spin it the throttle bracket would flop to the fender side and may avoid the acc pump levers since cable would pull from a different side of the carb? Also, that would put the choke spring right over the exhaust.

 

[Manic Mechanic]

Yes the choke was originally over the exhaust in the factory setup. As well as the throttle pulling from the fender side. The other thing it does is reduce the amount of fuel line running near the exhaust allowing it to be cooler.

Also by flipping it around it would give you a more natural throttle pull with the cable. As you have it now it would need to pull from the bottom to get the blades to open correctly as opposed to the top.

 

[JeepinMike]

Yes the choke was originally over the exhaust in the factory setup. As well as the throttle pulling from the fender side. The other thing it does is reduce the amount of fuel line running near the exhaust allowing it to be cooler.

Also by flipping it around it would give you a more natural throttle pull with the cable. As you have it now it would need to pull from the bottom to get the blades to open correctly as opposed to the top.

I appreciate the reply and I'll test fit the carburetor turned 180. It's important to note that the original Holley 390 cfm was mounted "backwards" for ~20 years and ran well for for the 5 years that I previously owned the Jeep. I talked to Clifford performance and they said it mad no difference which way the carburetor was clocked on the Clifford intake. I am open to all possible positions to mounting the carburetor, although mounting sideways does present some clearance issues with the brake booster. Thanks for pointed out which way the factory had setup was configured.

 

[Manic Mechanic]

Factory would've been a 1 barrel with a downward pull via linkages. When I switched to the MC 2100 and later Holley sniper EFI based off the 2300 I used a stock throttle cable from a AMC 304 powered CJ7

 

[Belizean]

M M is that cable different from a AMC 258 i6 / 4.2l cable ? I’ve been dealing with something on mine. I get a slight sticking right at the beginning, sometimes at the beginning of acceleration. The cable and linkages do not stick when I’m manipulating under the hood. Also the acceleration is very sensitive so it takes off.

 

[Manic Mechanic]

Yes it is different.

 

[Manic Mechanic]

I'd have to double check measurements but I believe the 77-83 AMC 304 powered 7s have a 18.225" long cable and the stock 6 cylinder is 21.5"

 

[Belizean]

That’s a big difference. Interesting.

 

[Jeep Soup]

My Nickel.95,
On Some Carbureted Rigs, The Carb is turned to Stop Flooding or Starvation if you are going to do some Serious Off Roading. Mostly for climbing angles…..
Anyone can Fall Off/Down a Mountain…..LOL
WEBER Carbs sells different top gaskets to stop “Vent Flooding” for Off Road
applications.

Just a thought…..

 

[Manic Mechanic]

My Nickel.95,
On Some Carbureted Rigs, The Carb is turned to Stop Flooding or Starvation if you are going to do some Serious Off Roading. Mostly for climbing angles…..
Anyone can Fall Off/Down a Mountain…..LOL
WEBER Carbs sells different top gaskets to stop “Vent Flooding” for Off Road
applications.

Just a thought…..

I ran the MC 2100 for this reason. It was a great carb for off roading (and just about anything else) although I didn't need to spin it at all. Mine came off a 72 bronco with the 302

 

[JeepinMike]

My Nickel.95,
On Some Carbureted Rigs, The Carb is turned to Stop Flooding or Starvation if you are going to do some Serious Off Roading. Mostly for climbing angles…..
Anyone can Fall Off/Down a Mountain…..LOL
WEBER Carbs sells different top gaskets to stop “Vent Flooding” for Off Road
applications.

Just a thought…..

Turned so float bowls are side to side instead of front to back? If so that's how I would like to mount it but the brake booster is kind of in the way. Jeep will be mostly a cruiser so I might not really matter.

 

[Manic Mechanic]

Turned so float bowls are side to side instead of front to back? If so that's how I would like to mount it but the brake booster is kind of in the way. Jeep will be mostly a cruiser so I might not really matter.

You can always go EFI and not worry about the float bowls

 

[Jeep Soup]

Yes, and see which way the Floats pivot.