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nitrohemi
315 dual quad


should I be running a 1:1 linkage on my offy dual quad intake. I have 2 inch 4 hole spacers under ededlborck carbs and have a annoying off idle stumble with progressive linkage. this is on a stock truck 315 motor. what do you dodge hemi guys run?
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on: Thu 28 of Jun, 2012 [03:12 UTC] reads: 16772

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32plym
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Re: 315 dual quad
on: Thu 12 of Jul, 2012 [02:20 UTC] score: 0.00
I'll give you the long reach plugs on your poly head. Dodge 325 hemis use short reach. Call Bob @ Hot Heads for his recomendation on the heat range.
The 1406 600 CFM carb is a bit rich for a 315 2x4 setup. Determine if the jets, rods, and springs are what was in the carb when new. Use the original setup as a baseline for checking whatever plus are recommended for the 315. Chances they will show a rich condition. Black and even sooty after a few runs. Hopefully you can get the carbs leaned down for the plugs to show a light tan or brown pattern. Google Edelbrock 1406 manual and download the manual in PDF when you see "manual" highlighted. As I stated earlier I finally went to 1403/1404 500 cfm carbs for the best performance without resorting to hunting down obsolete 400 cfm equipment. Have you considered going back to a 4bbl? I apologize for being so long winded as this problem as this should be discussed face to face over a beer or 3.

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32plym
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Re: 315 dual quad
on: Wed 11 of Jul, 2012 [03:39 UTC] score: 0.00
Lets start over again. What Edelbrock carbs are you working with? The P/N is found on the left front corner of the of the base of the carb as you're looking over the radiator. 1403/1404 is 500 cfm, 1405/1406 is 600 cfm. Anything bigger than that is probably too much for your application. Unless your plugs are all fouled up that probably isn't where your trouble is. I presume you are using short reach plugs. Good luck.

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nitrohemi
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Re: Re: 315 dual quad
on: Wed 11 of Jul, 2012 [10:28 UTC] score: 0.00
1406 carbs. I am using long reach plugs. ones for a 426 hemi. if you but short reach plugs in the don;t even come out into the combustion chamber. I don;t have old gas just maybe a bad batch form the pump. have gotten that before

> Lets start over again. What Edelbrock carbs are you working with? The P/N is found on the left front corner of the of the base of the carb as you're looking over the radiator. 1403/1404 is 500 cfm, 1405/1406 is 600 cfm. Anything bigger than that is probably too much for your application. Unless your plugs are all fouled up that probably isn't where your trouble is. I presume you are using short reach plugs. Good luck.

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nitrohemi
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Re: 315 dual quad
on: Wed 11 of Jul, 2012 [00:02 UTC] score: 0.00
I have been playing around with it and it seems to run lean but what I have the carb set at I would think it would be way too rich. I have 17 pounds of vacuum with a 68 442 metering rod in the primary. going to try new plugs and new gas next


> should I be running a 1:1 linkage on my offy dual quad intake. I have 2 inch 4 hole spacers under ededlborck carbs and have a annoying off idle stumble with progressive linkage. this is on a stock truck 315 motor. what do you dodge hemi guys run?

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George
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Re: Re: 315 dual quad
on: Wed 11 of Jul, 2012 [02:46 UTC] score: 0.00
>. going to try new gas next
>
>
>
??????old gas?

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32plym
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Re: 315 dual quad
on: Tue 03 of Jul, 2012 [12:57 UTC] score: 0.00
George's post was interesting. I was surprised by the large amount of WCFB & AFB carbs for sale on ebay. The only problem, unless you are a purist, rounding up a serviceable carb may be a real hassle. They had their shortcomings and may not be worth the trouble. There's enough to go wrong on vintage cars and engines without adding carburetors to the mix.
That's why I use Edelbrock.

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George
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Re: Re: 315 dual quad
on: Tue 10 of Jul, 2012 [16:37 UTC] score: 0.00
> George's post was interesting. I was surprised by the large amount of WCFB & AFB carbs for sale on ebay. The only problem, unless you are a purist, rounding up a serviceable carb may be a real hassle. They had their shortcomings and may not be worth the trouble. There's enough to go wrong on vintage cars and engines without adding carburetors to the mix.
> That's why I use Edelbrock.

See the pair of Carter 400s in the classifieds?

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32plym
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Re: Re: Re: 315 dual quad
on: Wed 11 of Jul, 2012 [03:47 UTC] score: 0.00
> > George's post was interesting. I was surprised by the large amount of WCFB & AFB carbs for sale on ebay. The only problem, unless you are a purist, rounding up a serviceable carb may be a real hassle. They had their shortcomings and may not be worth the trouble. There's enough to go wrong on vintage cars and engines without adding carburetors to the mix.
> > That's why I use Edelbrock.
>
> See the pair of Carter 400s in the classifieds?

That could be the hot setup for our friend if the tariff isn't too steep and the parts are still there. Go for it.

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BOBF
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Re: Re: 315 dual quad
on: Tue 03 of Jul, 2012 [13:25 UTC] score: 0.00
> George's post was interesting. I was surprised by the large amount of WCFB & AFB carbs for sale on ebay. The only problem, unless you are a purist, rounding up a serviceable carb may be a real hassle. They had their shortcomings and may not be worth the trouble. There's enough to go wrong on vintage cars and engines without adding carburetors to the mix.
> That's why I use Edelbrock.


I have to say 32 PLY has it right. More then 1 carb. on a vintage motor can be a hassle. I am using 3 stromburg on a 270 Dodge, it looks cool but I have had some problems. It runs great now.
I think if I had to do over I would use a single 4 bbl. carb.
Good luck.
Bob


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Jim
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Re: 315 dual quad
on: Mon 02 of Jul, 2012 [17:57 UTC] score: 0.00
> should I be running a 1:1 linkage on my offy dual quad intake. I have 2 inch 4 hole spacers under ededlborck carbs and have a annoying off idle stumble with progressive linkage. this is on a stock truck 315 motor. what do you dodge hemi guys run?


If you want that Holley look and parts availability, they made/make a 385cfm 4bbl for GM v6's. It was either a List 4150 or 4160. I put one on a '74 Datsun 260Z.

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George
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Re: Re: 315 dual quad
on: Tue 03 of Jul, 2012 [00:53 UTC] score: 0.00
> >> If you want that Holley look and parts availability, they made/make a 385cfm 4bbl for GM v6's. It was either a List 4150 or 4160. I put one on a '74 Datsun 260Z.

They'd have to go on sideways.....

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32plym
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Re: 315 dual quad
on: Sat 30 of Jun, 2012 [16:26 UTC] score: 0.00
>What carbs are you running? 500's are as small as you can go. Did you pull any plugs to see how they are burning? I run Edel. 500s 2 stages lean and have no stumble after warm up. I should mention it's a '57 KD500 hemilol engine with a mild cam. It was originally set up to run progressive but the front cylinders ran too lean. After a chat with Bob at Knoxville I readjusted the Edelbrock linkage to operate 1:1. It has more acceleration now and improved gas mileage by 2 MPG. Look for the online carb manual. It may help you out.

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Jim
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Re: 315 dual quad
on: Thu 28 of Jun, 2012 [18:29 UTC] score: 0.00
> should I be running a 1:1 linkage on my offy dual quad intake. I have 2 inch 4 hole spacers under ededlborck carbs and have a annoying off idle stumble with progressive linkage. this is on a stock truck 315 motor. what do you dodge hemi guys run?


I'd be amazed if you didn't have big stumble if you are running dual 4's on a stock 315 truck motor. It sounds like way too much carb unless they are LBM's (Little Biddy Mothers).

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nitrohemi
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Re: Re: 315 dual quad
on: Thu 28 of Jun, 2012 [22:00 UTC] score: 0.00
> > should I be running a 1:1 linkage on my offy dual quad intake. I have 2 inch 4 hole spacers under ededlborck carbs and have a annoying off idle stumble with progressive linkage. this is on a stock truck 315 motor. what do you dodge hemi guys run?
>
>
> I'd be amazed if you didn't have big stumble if you are running dual 4's on a stock 315 truck motor. It sounds like way too much carb unless they are LBM's (Little Biddy Mothers).

I can live wiht the stumble that I have. runs great at 2000 and up. I figured it would be a pain to adjust. looks cool though


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George
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Re: Re: Re: 315 dual quad
on: Mon 02 of Jul, 2012 [15:28 UTC] score: 0.00

>
> I can live wiht the stumble that I have. runs great at 2000 and up. I figured it would be a pain to adjust. looks cool though
>
Well if you can live with it....if not you could always put on a pair of WCFB & Carter also made 400 CFM AFBs, even matched pairs for 2X4 set ups.


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