One quick question. Which intake system would be more effective for towing purposes, a clifford triple duce with three holley 500's or an offy DP with a road demon jr.? I was considering a 460 but the cost would be as much if not more to convert and besides I love my six. Thanks

 

stick with a single carb, much easier to set up and keep running correctly.

 

Set-up isn't the problem. I still have my gauges and merc. sticks from when I ran a '71 Demon with a 225-slant-six with 3-webers. (everyone hated that car especially the little camaro boys) I do agree that they take a little time and patience to set up but would it be worth it? I know it was worth it with my old mopar.

 

I really have to wonder what kind of throttle response and low end you would have with three 500 cfm carburetors on an engine that usually does fine with one. I'd stick with one.
I've always wondered how a modified 300 would run with a bank of 6 42mm Mikunis run Jaguar style would run though. Probably vapor lock from exhaust manifold heat.

 

I hope somebody will respond to your question. I have thought about running 3-2 setup when/if I get my 71 F-100 back on the road.

 

The big question with the 3x2 setup is: Does the engine run on the center carb until it's opened up, or does it run on all three all of the time. If you're running on the center carb, the engine would only see the incrceased cfm under high throttle openings. If on all three all of the time, the cfm may be too high. Multiple carbs are neat though!

 

When I do set-up my 3-dueces the best way will be to set-up a progressive linkage. In other words, you start out on one carb and as the throttle is depressed it will go to 2-carbs and then all three. If you mash-it to the floor all three will open in sequence. (my dad showed me how to set-em up when I was a kid) As for the cfm's being to much, that's where the cam comes in. According to clifford and a few other reliable sources(my dad and friends) a minimum cam duration of 290 will work. Over 300 is preferrable and will work best. As soon as I get it set-up I'll let every body know how it work's out. It will be a few weeks till I get everything together. One things for sure it will look impressive when I lift the hood and I'm confident it will run just as impressive.

 

Old mopar six-pack cars ran on the center carb until right about 2/3 throttle. After that the other two would open together causing the infamous "mopar choke" just before the ensuing rush of pure hell from under the hood.

Just for measure, the 1969-1970-1971 440 6bbl. roadrunners used 3 500cfm holleys. I think a trio of 500cfm 2bbls would be a bit much for the ole' 300 with just a performance cam.

The Aussie division of Chrysler had a Valiant in 1972 that had the "hemi six-pack", mainly a hemi version of the 225 slant six but with a heavy iron hemi head and a trio of weber carbs, it was the fastest production car in Austrailia until just recently. Those cars ran a progressive linkage and were known to be weak in midrange tq until the owner put a 440 six pack style linkage on. The progressive linkage was used on the Hemi-sixpack Valiants for fuel mileage more than anything.(just a little usless info)

 

Thanks roadswimmer, now I'm getting somewhere. So, the progressive
linkage is a good thing. The torq was my original question. I didn't haul or tow anything with my little six-banger back in the day. So, in a lite car you would'nt notice any lag or choke.