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Carbs for an Edelbrock UR-18 Tunnel Ram

Printed From: TheAMCForum.com
Category: The Garage
Forum Name: AMC V8 Engine Repair and Modifications
Forum Description: AMC-made V8 engine mechanical, ignition and fuel from basic repair to high-perf modifications
URL: https://theamcforum.com/forum/forum_posts.asp?TID=99696
Printed Date: Mar/29/2024 at 3:01am
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Topic: Carbs for an Edelbrock UR-18 Tunnel Ram
Posted By: PROSTOCKTOM
Subject: Carbs for an Edelbrock UR-18 Tunnel Ram
Date Posted: Apr/25/2019 at 4:09pm
Now that I am officially an Edelbrock UR-18 intake manifold owner I need to find a set of carbs to go on it. Who has a UR-18?  I need to run Dominators to make it look correct on my Wally Booth Hornet replica. My guess is that it would run better on 750 cfm Dominators than the 1050 Dominators they used during the AMC Pro Stock era, but maybe 1050's are the way to go. So if you have real experience or own a setup please post a comment. I am sure there has to be a few guys on here that have raced or are still racing with a tunnel ram. I had to repost the photos with an AR valve cover in place. They just look so good with the intake.

Thanks,
Tom







Replies:
Posted By: javelinken
Date Posted: Apr/25/2019 at 4:26pm
what I started to do was I bought the base that went from the dominator bolt pattern to a 4150 carburetor. When I mocked it up to see if it would fit under my super stock hood scoop I would of had to get creative to make it fit so that is when I went with efi the throttle bodies are shorter and it still looks mean like a tunnel ram should it should be done later this summer so we will see if it was worth it.

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1968 javelin sst 1966 rambler classic convertible. Now up to 3 quarter midgets


Posted By: Hurst390
Date Posted: Apr/25/2019 at 4:33pm
8896 holleys with 86 jets power valves plugged

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SC/Hurst Rambler

11.62 120

100% Street Legal


Posted By: PROSTOCKTOM
Date Posted: Apr/25/2019 at 6:48pm
Originally posted by Hurst390 Hurst390 wrote:

8896 holleys with 86 jets power valves plugged
8966 carbs are listed for 1 x 4. Why did you us them over a 9375 which is listed as 2 x 4 carbs. What car is this engine in?

Tom


Posted By: Phitown Hustler
Date Posted: Apr/25/2019 at 7:11pm
 Not racing this car but for the street I went with 2 Edelbrock AVS 500 carbs to retain velocity with 2.08 valves and large ported heads on a built 401 with a 240/110 mechanical cam. I used 2 Offy 1" adapters turned upside down and countersunk the bolts to adapt the 4150 style carbs to the Dominator pattern as i did not want to drill the top. With 1000 cfm on tap I still have instant startup and throttle response with these carbs that required very little tuning. I will also add I chose these carbs to fit under my Rebel Machine hood scoop which they clear by an inch or so.

Enjoy the best AMC intake manifold ever built!!!






Posted By: tsanchez
Date Posted: Apr/25/2019 at 7:28pm
I ran two 750 dominators for 25 years, then modified them two years ago to 1050s, they both run well.
I prefer the 1050 2 circuit cars, mine are modified from there to have a jet in the transfer slot. 


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http://s192.photobucket.com/user/antonsan/media/jav1_zps87a70dce.jpg.html" rel="nofollow">


Posted By: Judo390
Date Posted: Apr/25/2019 at 9:11pm
I ran Holley 660 center shooters on a UR18 in the mid 70's. High 6's, 106.10 mph in the 1/8th. 390 Gremlin built per AMC performance manual specs. Garage modified very crude suspension, sub frames tied, 5.13 Dana 60, homemade ladder bars after it bent the Lakewoods all to heck.

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Posted By: Phitown Hustler
Date Posted: Apr/26/2019 at 6:10am
BLP makes some neat dual pattern baseplates for more 4150 carb choices


Posted By: easydean
Date Posted: Apr/26/2019 at 7:42am
I have a pair of 750 Dominators if interested.


Posted By: Hurst390
Date Posted: Apr/26/2019 at 6:05pm
[/QUOTE] 8966 carbs are listed for 1 x 4. Why did you us them over a 9375 which is listed as 2 x 4 carbs. What car is this engine in?

Tom
[/QUOTE]
Because they are what I had..
Engine is in a Gremlin


-------------
SC/Hurst Rambler

11.62 120

100% Street Legal


Posted By: jpnjim
Date Posted: Apr/27/2019 at 7:30am
Are you going to street drive it at all?

Where are you with the rest of the engine?

Are you trying to recreate a Booth replica engine as well (360ish cubes, big bore, short stroke, huge heads, etc),

or are will it be a more conventional 401" plus build?

Or asked another way,
 are you making airflow for the UR with RPM alone, or RPM and max cubes?


If you're building the engine around the intake, and you're not worried about the street I can't see any reason not to go 1050's.

If being streetable is a goal you might as well start with every advantage you can for that and do the 750 Doms.    probably has more info on this

  tsanchez  would be the man to talk to about what works where and why for anything to do with the UR tho



I want to hear about the rest of the engine build Big smile

The UR and VC's together = Clap StarStarStarStarStar


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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords


Posted By: PROSTOCKTOM
Date Posted: Apr/27/2019 at 9:19am
I guess down deep I already knew the answer to my original post, so I went ahead and ordered a new pair of 9375 carbs this morning and a set of Visner shear plates to go with them. Thanks to all that replied.

Tom 


Posted By: jpnjim
Date Posted: Apr/27/2019 at 2:09pm
Originally posted by PROSTOCKTOM PROSTOCKTOM wrote:

I guess down deep I already knew the answer to my original post, so I went ahead and ordered a new pair of 9375 carbs this morning and a set of Visner shear plates to go with them. Thanks to all that replied.

Tom 


Clap

1050 for the win Smile


Not to muddy the waters after you made your choice,

but did you think about going vintage and getting some of the older style with the choke housings still cast on?


Probably down on performance, but up on nostalgia Big smile




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71 P-code 4spd Javelin/AMX
some Jeeps and some Fords


Posted By: Trader
Date Posted: Apr/27/2019 at 4:46pm
I was not going to say anything until you made your choice but I believe it's a good one.
Buddy has a Dart motor that had 2x750 Dominators and changed up to the 1050's and it has never ran better. From idle (still very rough) to full throttle.

I'm actually sorry I made recommendations for Bill's 2x4 360 as the "volume math" does not work on an 2x4 setup - very obvious. Can only guess it has something to do with vacuum signal on the bigger volume intake.


Posted By: 343sharpstick
Date Posted: Jun/20/2019 at 2:34pm
Please keep us posted on how things are going on this, or any other UR-18 projects.
I just got my UR-18 and I'm looking at various fueling options.

As a side, anyone have any history on these? I didn't realize how rare these were until I decided to try and get my hands on one.Shocked

Thanks!


Posted By: Phitown Hustler
Date Posted: Jun/20/2019 at 3:18pm
Get ya some of the new CNC gaskets now available on ebay. Fabricating these is no fun zone. I'm installing mine this weekend

https://www.ebay.com/itm/Plenum-GasketS-that-fits-the-EDELBROCK-UR-11-TUNNELRAM-intake-for-AMC-engines/264299337440?hash=item3d8977d6e0:g:pjkAAOSwAOxbqlAa" rel="nofollow - https://www.ebay.com/itm/Plenum-GasketS-that-fits-the-EDELBROCK-UR-11-TUNNELRAM-intake-for-AMC-engines/264299337440?hash=item3d8977d6e0:g:pjkAAOSwAOxbqlAa


Posted By: 343sharpstick
Date Posted: Jun/20/2019 at 10:02pm
DONE.
that’s great, I just pulled mine apart and was wondering how I would be making those gaskets!



Posted By: pfordamx
Date Posted: Jun/20/2019 at 10:11pm
since its got the 4500 pattern 2 750 Dominators would be my choice unless your going to put alot of motor under it.


Posted By: Holeshot
Date Posted: Nov/24/2022 at 11:48am
From the Kenosha Visitor's Center Museum... Booth's Gremlin pics... 

https://daveyho.wordpress.com/kenosha-visitors-center/" rel="nofollow - https://daveyho.wordpress.com/kenosha-visitors-center/


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|'69 AMX BBO 390 9.88 qtr. | '71 AMX 401 w/Richmond 5-spd | 2012 Hemi Challenger R/T 6-spd w/Sidewinders | Michigan 49120|


Posted By: easydean
Date Posted: Nov/24/2022 at 12:17pm
660 center squirters is best in my open unless it’s a full blown drag car


Posted By: Hurst390
Date Posted: Nov/25/2022 at 7:29am
If your not good at holding your breath? Get some 02 tanks before the new year price increase.

-------------
SC/Hurst Rambler

11.62 120

100% Street Legal


Posted By: LetsFNgo
Date Posted: Nov/26/2022 at 6:48pm
I am of no help here but just want to say that is awesome.



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