Tunnel ram guys. A few questions please?

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Dartthunder340

Dartthunder340

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What size carbs are you running? I have a stock stroke 340 with ported x heads and a .509 cam put together for an old school build. The tunnel ram on it right now has 450’s? I know they are Holleys, but really not sure of them. Would like to mount them sideways, because I think it looks cooler and would suit the build better. As I understand, the 450 only has jets on the secondary side? The primary is adjusted by a metering plate? I’ve heard that 660’s are a great choice, but are pricey brand new. I’ve got no problem running what I have for now, but would the linkage work mounting them sideways? Thanks for any help and replies!
 
Not sure yet, haha! This was a motor I bought assembled that was a good candidate for my build, so I jumped on it. Don’t really plan on racing this at all. Maybe some off the street drags at an 1/8 mile track close by (it’s always no prep stuff). I’ve got a ‘67 Dart that’s a bracket car for more serious stuff.
 
I wouldn't use a 660 I'd they were free.

You can easily use 650's from ProForm. If you can't tune the carbs for the TR, contact someone that can.

Two things kill tunnel Rams. Too much cam, and small, junky, intuneable carbs.
 
yellow rose said:
I wouldn't use a 660 I'd they were free.

You can easily use 650's from ProForm. If you can't tune the carbs for the TR, contact someone that can.

Two things kill tunnel Rams. Too much cam, and small, junky, intuneable carbs.
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How have you been?! I asked a question from you a while back on a T/A or W2 rockers thread. Hope your headaches are getting better!
 
Those 450's are odd carbs mechanical secondary's and no accelerator pump, they go lean for a second or more when you snap the throttle open. I played with a set on a 327 Chevy with a tunnel ram and got them working good but I think a couple 650's would have been much better.
 
MOPAROFFICIAL said:
Hmm those are funny, thought is was the other way around, jets then plate on sec.
Take them apart man! Lol
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This ^^^^^ is correct about the 450. They have a regular metering plate on the primary side and a metering plate (not block) on the secondary side. They are also mechanical secondary carburetors.
 
With most intakes in a max effort deal.. you need to work them to get them to perform/flow inline with the head 'when bolted on', ideally.
now with a tunnel ram... not much working neccessary to get the big power.
 
The 318 I just bought has a pair of 600 vac sec's on an old edelbrock tunnel ram. His car ran a 13.2 with a 4 speed and 4.11 rear gears in a '68 valiant like mine.
Neil.
 
yellow rose said:
I wouldn't use a 660 I'd they were free.

You can easily use 650's from ProForm. If you can't tune the carbs for the TR, contact someone that can.

Two things kill tunnel Rams. Too much cam, and small, junky, intuneable carbs.
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And too much carb...….


FWIW, Ive tried 650,600 holleys on BB tunnel ram set up.

Finally was able to tune holley 450's runs the best... especially on street.
 
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mygasser said:
The 318 I just bought has a pair of 600 vac sec's on an old edelbrock tunnel ram. His car ran a 13.2 with a 4 speed and 4.11 rear gears in a '68 valiant like mine.
Neil.
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If that's an Edelbrock Street Tunnel Ram with the big funny inflated lookin plenum top, that's about the best tunnel ram ever made. You better hold onto that one.
 
Like this. This is for a big block Chevy. Finding even a picture of one for a Mopar is hard now. If yours looks like this, it's a damn good one.

STREET TUNNEL RAM.jpg
 
RustyRatRod said:
Like this. This is for a big block Chevy. Finding even a picture of one for a Mopar is hard now. If yours looks like this, it's a damn good one.

View attachment 1715399195
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That's the one mate. The guy had 2 of them, one on the 318 and one on the 408 he's replacing it with. He asked me £600 for the motor and £500 for the tunnel ram with carbs and linkage. I gave him £1000 for both which I thought was a bargain.
There's a pic in my thread '68 valiant signet in (i think) members restorations.
Neil.

318 engine.jpg
 
mygasser said:
That's the one mate. The guy had 2 of them, one on the 318 and one on the 408 he's replacing it with. He asked me £600 for the motor and £500 for the tunnel ram with carbs and linkage. I gave him £1000 for both which I thought was a bargain.
Neil.
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You better keep that one then.
 
Would the 500 cfm Holley two barrel carbs they use on circle track motors be a good candidate for a dual tunnel ram? Should be tunable and not break the bank. Definitely not as sexy as dual fours though.
 
gzig5 said:
Would the 500 cfm Holley two barrel carbs they use on circle track motors be a good candidate for a dual tunnel ram? Should be tunable and not break the bank. Definitely not as sexy as dual fours though.
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Probably, but I would use 500 Eddy AFBs first. The cost would likely be about the same.
 
gzig5 said:
Would the 500 cfm Holley two barrel carbs they use on circle track motors be a good candidate for a dual tunnel ram? Should be tunable and not break the bank. Definitely not as sexy as dual fours though.
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The problem is you'll have a 1000 cfm double plumper and a progressive linkage would only help slightly but would ruin fuel distribution at part throttle. Two 4 barrels will only use the primaries at part throttle so in my case I'd have a 600 double plumper then at wide open up to 1200 cfm (although my little 318 probably won't create enough vacuum to fully open the secondaries).
Neil.
 
Dartthunder340 said:
How have you been?! I asked a question from you a while back on a T/A or W2 rockers thread. Hope your headaches are getting better!
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Sorry dart, I didn't see it. Can you put a link to the thread here or PM me??

Thanks. My new glasses did the trick. Took about a week after I got them for my eyes to finally adjust. I'd rather loose my hearing (and I probably will, and that will make so the I can't hear the wife!!!!!) than my vision. If I can't read, I'd really just rather be dead. And my hands make so Braille probably wouldn't be an option.
 
mycuda said:
And too much carb...….


FWIW, Ive tried 650,600 holleys on BB tunnel ram set up.

Finally was able to tune holley 450's runs the best... especially on street.
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If you use the math for carb selection that's been palmed off forever as correct, everything is over carb'd.

If it was mine, I'd use two 750's and not think about it. If it was a straight drag car I'd start with two 1050's and go.

Over carburation is highly overrated. What most people think is too big a carb is too big of a cam, or even more correctly stated, the wrong cam timing.
 
I remember five years ago when I talked about putting dual quads on my 318 this forum literally was out to Tar and feather me LOL how times have changed look at everybody cheering you on...
I came back from the track with a time slip that shaved a half a second off my quarter mile...
1407 Edelbrock 600 on the front and a 625 Carter performance on the back..
 
It is all on what you know and can do.
I had 2 holley 600 vacuum secondaries on a weiand tunnel ram 318 and it ran great.
Things can work,if you know what you are doing.
 
Well, I don’t really know what I’m doing, haha! I love the old school look and think it will go great with my ‘65 Dart. Looking forward to messing around with it though and going through the learning process!
 
yellow rose said:
Sorry dart, I didn't see it. Can you put a link to the thread here or PM me??

Thanks. My new glasses did the trick. Took about a week after I got them for my eyes to finally adjust. I'd rather loose my hearing (and I probably will, and that will make so the I can't hear the wife!!!!!) than my vision. If I can't read, I'd really just rather be dead. And my hands make so Braille probably wouldn't be an option.
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Dartthunder340 said:
Well, I don’t really know what I’m doing, haha! I love the old school look and think it will go great with my ‘65 Dart. Looking forward to messing around with it though and going through the learning process!
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You'll get an education mounting those things sideways. linkage wise....
 
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