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Holley Dual Feed Line
So sick of the details!!

I tried plumbing up my carb with one of the dual feed lines, and the spacing is off.  I tried to make it work, but it is leaking like crazy as my float bowl centers are farther apart than the line is build for.

So I tried to take what I thought was an accurate measurement and came up with a 9.5 inch spacing center to center.  Does that sound correct?

So tired of trying to figure this out!!!

[Image: CArb-Line-Spacing.jpg]
It's an 88670

Perhaps the billet metering blocks are a little thicker than the stock ones. This is the style I use.


73 conv. 460, D0VE large valve heads, Performer RPM manifold, Voodoo 227/233 cam, Holley 950 HP carb, C6 trans, 3.25 trak-loc.
I had the same problem years ago, I could never get it to stop leaking. I put on the Summit adjustable feed line with built in pressure gauge, no problems since then.

“If you can't explain it simply, you don't understand it well enough.”
--Albert Einstein
You said 88670, did you mean 80670? I could not find that number on Summit or did I just miss it. You have pretty blue metering blocks, are they different?
Here's a pic of my 80670. You may have got the wrong tube I think. If it's not a Holley tube, that may be the problem. If not you must use two wrenches together. They will leak if not completely tight. Problem is Holley did not allow much space to get the 1" (I think) wrench on the filter nut. I had the same problem and damn near caught the engine on fire.
If I got you wrong on this, please ignore it!
EDIT: I do have an aftermarket tube. It measures 9 5/16" centers, but this one can easily be bent to adjust it, so that number may not be totally correct. I didn't use it because my engine tuner guy told me he has had several break where soldered. That would not be good. I can take a pic if you want.

[Image: IMG-0989.jpg]

And here is the custom 3/8" fuel feed line. I won't use rubber if I can avoid it to connect the carb.
[Image: IMG-0979.jpg]

 I learn something new every day!
Sorry I was out in the sun earlier and mis read the listing numbet.
[Image: list-number-new-carb.jpg]

I already have a 9 5/16 line like you stated that is giving me all the headache.

I was unsure how well the adjustable would seal, but they seem to get positive reviews from you guys.

I have the 770 Holley and I think I got the solid fuel line from them.
Identical to the one pictured by Stanglover. The lower right picture at
the top is where you attach a fuel pressure gauge.


[Image: 1_11_11_13_11_50_27.png]
At this time, I can't see nor upload pictures.
I'm not quite sure what you're meaning. You likely have the factory 5/16" feed line from pump to carb. I changed to 3/8"
The spare connector tube between the two bowls, measure 9 5/16" and that may not be totally accurate as you said your was 9.5" center to center.
If it leaks I'm thinking it's because the flare is not seated correctly or really tight. I know mine leaked, gas will go through just about any minute gap and yes, it's hard to get a good fit on the filter nut, but I just worked carefully on it till it stopped. Another reason it might leak is a scratch on the seat itself, it doesn't take much!
Anyway good luck stopping the leak, fuel on hot engines ain't a good thing!
Edit: added picture of old fuel connector, showing possible weak point in solder joint. Red arrows This type was not recommended.

 I learn something new every day!
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