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WHAT SIZE POWER VALVES SHOULD I USE? #987613
05/07/11 02:28 PM
05/07/11 02:28 PM
Joined: Jul 2004
Posts: 751
Hermiston Oregon
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mopar_leaner Offline OP
super stock
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Hermiston Oregon
I'm working on a tunnel rammed "stock" 318 with a pair of 1850 holley 600's on it. I just need to get it running ok, nothing great. I'm thinking because the engine is stock, I might need help keep the power valves closed longer so it would foul the plugs.


Last edited by mopar_leaner; 05/07/11 02:32 PM.

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Re: WHAT SIZE POWER VALVES SHOULD I USE? [Re: mopar_leaner] #987614
05/07/11 05:52 PM
05/07/11 05:52 PM
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Kern Dog Offline
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Granite Bay CA
Did I read this right? A STOCK 318 with 1200 cfm of carburetors?
You DO realize that even most 440s only had a 675 cfm 4 barrel?

Re: WHAT SIZE POWER VALVES SHOULD I USE? [Re: Kern Dog] #987615
05/07/11 05:55 PM
05/07/11 05:55 PM
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck Offline
Not enough dumb comments...yet
Mr.Yuck  Offline
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Posts: 24,562
Brookeville, Md
I'd think ONE holley would be plenty for a stock 318. And if you ran ONE stock PV I'd guess a 6.5 would do the trick. Maybe even higher. a tunnel ram on a stock engine isn't going to wrok very well.


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Re: WHAT SIZE POWER VALVES SHOULD I USE? [Re: Mr.Yuck] #987616
05/07/11 06:49 PM
05/07/11 06:49 PM
Joined: Jan 2003
Posts: 20,149
Park Forest, IL
slantzilla Offline
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slantzilla  Offline
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Posts: 20,149
Park Forest, IL
Power valves will probably be the least of your issues with that setup. If you don't have a really good ignition on it, it's gonna foul plugs anyway.

I'm guessing it's also an automatic with a stock converter and 3.23 or higher gears?


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Re: WHAT SIZE POWER VALVES SHOULD I USE? [Re: slantzilla] #987617
05/08/11 09:43 AM
05/08/11 09:43 AM
Joined: Jun 2010
Posts: 1,144
wellington ohio
68-scatpack-rt Offline
In thin ice
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Posts: 1,144
wellington ohio
i agree that the combo sounds a bit strange.

as far as the power valves go.....you need a vacume gauge to properly size the power valve. do a google search and you will find the proper procedure for selecting a power valve.


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Re: WHAT SIZE POWER VALVES SHOULD I USE? [Re: mopar_leaner] #987618
05/08/11 09:51 AM
05/08/11 09:51 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
Circle Track
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Lincoln Nebraska
Quote:

I just need to get it running ok, nothing great.


Might start w 1/2 of what your manifold vacuum reading is in drive at idle


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Re: WHAT SIZE POWER VALVES SHOULD I USE? [Re: mopar_leaner] #987619
05/08/11 01:25 PM
05/08/11 01:25 PM
Joined: Sep 2006
Posts: 1,139
West Tennessee
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rbstroker Offline
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Posts: 1,139
West Tennessee
Holly says to take a vacuum reading at idle in drive or in neutral if you have a manual trans. Divide by 2. the result is the power valve size. If you end up with a number between two power valve sizes, use the lower number.

Re: WHAT SIZE POWER VALVES SHOULD I USE? [Re: rbstroker] #987620
05/08/11 04:41 PM
05/08/11 04:41 PM
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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joedust451 Offline
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Branson, Mo.
If you get those carbs in tune, It will run fine, even on a stockish 318, A single carb set-up or smallers "carbs" of coarse would run better, but you won't have the "WOW" factor which i'm sure thats what your after & you already have the 600s, You may also need to jet those carbs down a bit.

The 1st. thing i would do is make sure the ignition is strong & in good shape, & get a quick timing curve in it with as much initual timing as possible, a good adj. dist. helps wonders with setting up the curve & RPM your after for total timing, I like the MSD 8534 Billet. Its simple, then run a digital box or a Mallory Highfire 6853M 6AL.

http://www.jegs.com/i/MSD+Ignition/121/8534/10002/-1

http://www.jegs.com/i/Mallory/650/6853M/10002/-1


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Re: WHAT SIZE POWER VALVES SHOULD I USE? [Re: joedust451] #987621
05/08/11 09:18 PM
05/08/11 09:18 PM
Joined: Mar 2003
Posts: 9,092
Rogue River, OR
Jeremiah Offline
master
Jeremiah  Offline
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Joined: Mar 2003
Posts: 9,092
Rogue River, OR
I would be looking at 10.5 PV's to start with if it is a healthy stock 318. Hopefully you have carb's with removable air bleeds because you will most likely need to lean out the idle circuit a ton with two carbs...unless the massive plenum area makes up for it. Who knows, with some tuning it might run fine.







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