Re: period correct tunnel rams carbs
 

that pic of the underside shows the only real diff.From the top they look exactly like a 750 SD AFB like what is on my bathtub pic.Tom

Re: period correct tunnel rams carbs
 

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Hemicolt</div><div class="ubbcode-body">From what I know, there is a dash and a number after the part number for every time there was a change in the carb.
In other words 1850 would be a first edition, 1850-1 would be second edition, etc.
I can't say for sure what -numbers indicate what year span, but I'm sure someone here or at Holley can tell you.
The 600's I'm going to use are 1850-1. They are all metal with the good metal floats. Everyone is pretty much right about the carbs., 660's are just about made for wide open only and very difficult to make work well for the street. </div></div>

Ok, so I should be looking for 1850's, or 1850-1's, with vacuum secondaries. What about choke? Are the 1850 series all manual choke units?

Also, I see some ad's that say '...not dual quad carbs...', what does that mean? Can't you just mount 2 of these 1850 units and connect them together with the throttle linkage and fuel lines? I'm not trying to make a masterpiece out of it, but want it to be functional and reasonably period correct.

Re: period correct tunnel rams carbs
 

You can look for any matched pair of 1850's. The only areas where they may be plastic are in the VS diaphragm cover and the arm that pushed on the accelerator pump. No big deal there.

You won't need to run a choke on this set-up. You'll just take those parts, including the choke plate off. Trust me, we can go outside today and my dual quad Malibu will fire right off. It might take just a little bit of pedal to keep the idle up enough so it won't stall, but the important part is that it fires right off. While you are working on the tune, it isn't uncommon to get a back fire every once in a while till it is fully sorted out. When that happens, the choke plates wedge closed and it is a problem.

I personally don't like to tie the VS together. I only want the carb to draw what it needs. I don't want it being biased by the draw of another part of the intake it isn't really contributing to.

As for them not being TR specific carbs,- don't sweat it. There are more details I don't feel like typing right now. Basically a TR carb will have some specific components and calibrations when carbs are originally intended to be run in pairs. The 1850 starts life as a basic, single 4 barell intended to stand on its own. I'd be happy to help you doccument the conversion of these carbs to your TR and show what mods enable them to become TR carbs.

A popular update kit for the carbs to have a secondary metering block kit added. If you get some with this already done, then that helps wiht the tune. I did this on my carbs. Basically a metering block and a longer fuel tube.

Now if you really want to look aggressive, you can look into running the dual feed or center hung float bowls. Some TR give you enough room to run them front to back, but some do not. I was talking to Grumpy not so long ago and he was mentioning that the sideways mounting of the carbs really is best in his eyes. It eliminated several inconsitant problems which he battled while racing. What do you like?

Re: period correct tunnel rams carbs
 

When you get to a certain model, the vac. secondary housing is plastic. I would try to stay with the earlier design. Idle, intermediate and high side air bleeds are not adjustable, so I can't say you need to be looking for a specific carb. I imagine you are going to rebuild any used carb. you get, so as long as they physically match, you can get them dialed in to match from a tuning stand point. And what I mean by that is squirter size and squirter cam profile, jets, etc.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: YENKO DEUCE REGISTRY</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Hemicolt</div><div class="ubbcode-body">From what I know, there is a dash and a number after the part number for every time there was a change in the carb.
In other words 1850 would be a first edition, 1850-1 would be second edition, etc.
I can't say for sure what -numbers indicate what year span, but I'm sure someone here or at Holley can tell you.
The 600's I'm going to use are 1850-1. They are all metal with the good metal floats. Everyone is pretty much right about the carbs., 660's are just about made for wide open only and very difficult to make work well for the street. </div></div>

Ok, so I should be looking for 1850's, or 1850-1's, with vacuum secondaries. What about choke? Are the 1850 series all manual choke units?

Also, I see some ad's that say '...not dual quad carbs...', what does that mean? Can't you just mount 2 of these 1850 units and connect them together with the throttle linkage and fuel lines? I'm not trying to make a masterpiece out of it, but want it to be functional and reasonably period correct. </div></div>

Re: period correct tunnel rams carbs
 

Ok, thanks. The hunt continues - along with the learning curve!

Re: period correct tunnel rams carbs
 

Picked up a pair of 1850's at Carlisle last Friday with the non-plastic vs setup. All there, including choke setups, etc.... Making a little progress here and there!

Now will need to determine how to cut the hood to clear all this stuff!

Re: period correct tunnel rams carbs
 

I thought I would bring this thread back........I just picked this Edelbrock TR2 tunnel ram up.

Kurt

http://i300.photobucket.com/albums/n...s/100_7246.jpg

http://i300.photobucket.com/albums/n...s/100_7235.jpg

http://i300.photobucket.com/albums/n...s/100_7244.jpg

http://i300.photobucket.com/albums/n...s/100_7248.jpg

http://i300.photobucket.com/albums/n...s/100_7236.jpg

http://i300.photobucket.com/albums/n...s/100_7239.jpg

http://i300.photobucket.com/albums/n...s/100_7243.jpg

http://i300.photobucket.com/albums/n...s/100_7250.jpg

http://i300.photobucket.com/albums/n...s/100_7251.jpg

Re: period correct tunnel rams carbs
 

Hey Kurt I think you can hide a jug of moonshine in that log...

Re: period correct tunnel rams carbs
 

Forgot about that thread....obviously I didn't make a decision last summer. Actually I ended up freshening the engine and transmission and doing some detail work instead of buying wheels.

Re: period correct tunnel rams carbs
 

Anybody ever try installing power valves in a pair of 660 center squirters on a tunnel ram?