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MAGNUM HEAD FLOW RESULTS #2800
08/21/03 10:54 PM
08/21/03 10:54 PM
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State College, PA
RyanJ Offline OP
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Just received the 8MM valves this afternoon. Here are the initial results, 1.92"/1.625" MP stainless valves, straight 45*, these are a set of Dodge Truck Magnum iron heads:

LIFT----AS CAST
---------IN/EX
.100"--67.3/N/A
.200"--131.3/97.3
.300"--185.6/132.5
.400"--212.5/144.9
.450"--213.9/146.3
.500"--212.2/146.3
.550"--212.5/146.3
.600"--213.9/146.6
.650"--214.2/147.3
.700"--215.3/147.3

Did some whittling on them:

















LIFT------IN/EX
.100"--67.3/N/A
.200"--132.8/115.6
.300"--196.0/156.6
.400"--225.0/172.2
.450"--238.1/174.3
.500"--250.5/176.6
.550"--257.1/178.0
.600"--259.1/180.8
.650"--259.1/180.8
.700"--259.8/180.8

The intake port has'nt had the chamber deshrouded on the sides, so the low lift will only get better. Overall I'm happy with it for a 1.92" valve and that God awful rocker boss taking up 1/2 the intake runner.

The exhaust I'm not happy with at all. It's either in the short turn, or just the still small runner/exit, So first order of business is to open it up a little more and see where that get's me. I will not quit until I see over 200 cfm.

Re: MAGNUM HEAD FLOW RESULTS [Re: RyanJ] #2801
08/21/03 11:10 PM
08/21/03 11:10 PM
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Alberta, Canada
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ktbundy Offline
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I'm interested to see where this one goes. Have you done a set of 308's yet? Just curious to see a side by side comparison.
Tom

Re: MAGNUM HEAD FLOW RESULTS [Re: ktbundy] #2802
08/21/03 11:22 PM
08/21/03 11:22 PM
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Amarillo, Texas
BBR Offline
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Cool! I've been wanting to know this info for a loooooonng time. Looks like MP is underrating them just a touch. They claim 190 cfm @ 0.550 (intake) for the plain ole untouched Mag head.

can't wait to see the final outcome! Just wish you would have started with the Magnum R/T heads!


Drag Week 2011 - 77th place - DD
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Drag Week 2014 - Kapooya
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Re: MAGNUM HEAD FLOW RESULTS [Re: ktbundy] #2803
08/21/03 11:22 PM
08/21/03 11:22 PM
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State College, PA
RyanJ Offline OP
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Never done a 308. So Who wants to be the guinea pig on those? LOL That is how I ended up with these Magnums, mentioned I had never done one yet and had wanted to for quite some time just to see what they can do... and here they are LOL.

Re: MAGNUM HEAD FLOW RESULTS [Re: BBR] #2804
08/21/03 11:41 PM
08/21/03 11:41 PM
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State College, PA
RyanJ Offline OP
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Quote:



can't wait to see the final outcome! Just wish you would have started with the Magnum R/T heads!




This is about as good as the intake is going to get with a 1.92" valve as far as peak # goes. I will probably get one or two to go over 260 but that is kind of trivial..... If I had to GUESS, I'd say a 2.02 in these heads might do 268? Maybe touch a 270 if I'm lucky?? The runner and rocker boss are going to prevent the BIG #'s everyone would like to see. Realisitically these will make plenty of power. With a 2.02, they will be close to a ported E head.

All I've ever heard about the R/T head is that it has a W-2 intake bowl in it. Well I'm here to tell you, these regular magnums are pretty damn good in their own right. Look at how nice my bowl is.... You can't do that with a J head without hitting water. As for R/T heads I don't see a huge advantage, if the bowl is the only difference. I guess I need one in my hands to know for sure. Hint hint......


Re: MAGNUM HEAD FLOW RESULTS [Re: RyanJ] #2805
08/22/03 07:12 AM
08/22/03 07:12 AM
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THIS post needs to go to the Tech. archives......

I did almost the same work on the heads that I installed on my stroker,but with 1.970's,and was wondering if/what they would flow(no bench)I like what you did with the exhaust port!! Was considering a set of R/T's for later on down the road,but maybe NOT!!!


Karma has no menu. You get served what you deserve.
Re: MAGNUM HEAD FLOW RESULTS [Re: RyanJ] #2806
08/22/03 08:12 AM
08/22/03 08:12 AM
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Amarillo, Texas
65Dart270 Offline
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Thanks for the update, Ryan. How do these flow numbers stack up against other Mopar 2.02 iron heads? I know it's apples and oranges, given the difference in valve size, but I would be interested to know the comparison.


"Although prepared for martyrdom, I preferred that it be postponed."
Sir Winston Churchill
Re: MAGNUM HEAD FLOW RESULTS [Re: 65Dart270] #2807
08/22/03 09:06 AM
08/22/03 09:06 AM
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Grand Haven, MI
patrick Online content
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great info...I'm bummed by the stock exhaust flow, and even ported, the exhaust flow doesn't look that much better than an older head (no fault of yours, of course)

one more question: what are the port volumes? how do they compare with the port volumes of an older 360 head (J/596/et al), eddies, and 302's? pre and post porting?

if the port volume is close to the 302's you did, geez, box stock these would rock on a 318.


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Re: MAGNUM HEAD FLOW RESULTS [Re: patrick] #2808
08/22/03 09:50 AM
08/22/03 09:50 AM
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FastOne Offline
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Looks good to me.

Intake to exhaust is ok, I wouldn't beat yourself up over it.

I can see where you can whittle a bit more in the exhaust

Re: MAGNUM HEAD FLOW RESULTS [Re: RyanJ] #2809
08/22/03 11:31 AM
08/22/03 11:31 AM

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Great flow numbers in my opinion, I know who I'll be sending my castings to if my 318 ever dies. These heads do work really well on 318's. I did the swap and would recommend it over 302 heads any day.

Re: MAGNUM HEAD FLOW RESULTS [Re: FastOne] #2810
08/22/03 11:43 AM
08/22/03 11:43 AM
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State College, PA
RyanJ Offline OP
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Oh yeah, no doubt I left some flow on the table so to speak on the exhaust port, this was only the first port I have done LOL. So I stayed conservative, just looking at it though I would have GUESSED it would have done better than 180 but....... I'll put it back on the stands and do some more "whittling" and find more air. I just wanted to get some initial #'s out there, because I have had ALOT of guys Email and PM me wanting to know what the magnums are going to do LOL. So hopefully this will supress their appetite for a while until I can get the heads done and post the final results LOL.

OH and Patrick, I'll try to CC a runner today if I find time.

Re: MAGNUM HEAD FLOW RESULTS [Re: RyanJ] #2811
08/22/03 01:27 PM
08/22/03 01:27 PM
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Amarillo, Texas
BBR Offline
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Appetite suppressed for now....

Do you have any of your other as cast numbers available for comparison's sake? 302, J, X, W2, W5, etc.? There's probably alot of guys that will not do ANY porting and want to know if they are worth the conversion $.

That being said...

MORE, MORE, WE WANT MORE!

Oops I think I found some of them:

302's
LIFT----I-------E
0.100--55.2----34.5
0.200--105.2---70.7
0.300--152.0---104.2
0.400--187.0---113.2
0.450--189.8---115.5
0.500--190.1---117.3
0.550--190.4---119.0
0.600--190.4---120.4

596's
LIFT----I-------E
.100--62.8----48.3
.200--117.3---98.3
.300--174.2---120.8
.400--193.2---125.6
.450--192.5---127.7
.500--192.5---128.3
.550--192.5---129.0


Last edited by moparhead; 08/22/03 01:28 PM.

Drag Week 2011 - 77th place - DD
Drag Week 2012 - 2nd place SRBB N/A
Drag Week 2014 - Kapooya
RMRW 2018
RMRW 2020
Re: MAGNUM HEAD FLOW RESULTS [Re: BBR] #2812
08/22/03 02:10 PM
08/22/03 02:10 PM
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fast68plymouth Offline
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looks good so far!!
which casting number are you working with?
reportedly, some of the variations are bigger than the others.
as for the exhaust flow.....180 is plenty for about 550hp on a typical SB application.


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Re: MAGNUM HEAD FLOW RESULTS [Re: fast68plymouth] #2813
08/22/03 03:04 PM
08/22/03 03:04 PM
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State College, PA
RyanJ Offline OP
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Casting #'s that I saw were a 5300 and a 6671 cast on the top of the # 1 and 3 intake runners. Looks like a 1995 Casting.

Re: MAGNUM HEAD FLOW RESULTS [Re: RyanJ] #2814
08/22/03 04:49 PM
08/22/03 04:49 PM
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Detroit, MI
CokeBottleKid Offline
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nice, I have a nice 318 we can try them on .

Re: MAGNUM HEAD FLOW RESULTS [Re: CokeBottleKid] #2815
08/22/03 05:39 PM
08/22/03 05:39 PM
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State College, PA
RyanJ Offline OP
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Quote:

nice, I have a nice 318 we can try them on .




LOL no, they're going on a 402 in a nice '68 Barracuda

Re: MAGNUM HEAD FLOW RESULTS [Re: RyanJ] #2816
08/22/03 06:07 PM
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CokeBottleKid Offline
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318!

Re: MAGNUM HEAD FLOW RESULTS [Re: RyanJ] #2817
08/22/03 06:44 PM
08/22/03 06:44 PM
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Amarillo, Texas
65Dart270 Offline
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OK, after looking at the initial numbers, I was pretty impressed. However, I went back and dug through the archives and found all the "ported" and "as cast" flow numbers I could, and those Magnums stack up very well. I was very impressed when I saw the ported 915 #s:
Lift Int/Exh
.100 61.9/58.4
.200 134.3/115.2
.300 190.2/141.4
.400 233.4/157.8
.500 258.9/172.3
.550 267.9/175.5
.600 273.9/181.9

Comparing the Magnums to these, the Magnums were very close, and the Magnum R/T's with the 2.02 valves should theoretically outflow the 915's. Now THAT would be pretty impressive.


"Although prepared for martyrdom, I preferred that it be postponed."
Sir Winston Churchill
Re: MAGNUM HEAD FLOW RESULTS [Re: 65Dart270] #2818
08/22/03 07:57 PM
08/22/03 07:57 PM
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worthywads Offline
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I'm using the R/Ts for my daily driver below with my simple bowl cleanup. I did spend twice as long on the exhaust as the intake but did almost nothing on the intake valve guide like I see you've done. The numbers I saw (Car Craft) showed a major improvement on the exhaust side of the r/t vs magnum (168 vs 138 @0.50).

All your numbers are higher out of the box than what car craft got though.

I also widened the pushrod pinch by 0.08 and got rid of all the bosses? (lumps caused by neighboring threads).

I don't need the full on port you specialize in but i'd love to know what mine flow.


Re: MAGNUM HEAD FLOW RESULTS [Re: 65Dart270] #2819
08/22/03 09:09 PM
08/22/03 09:09 PM
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State College, PA
RyanJ Offline OP
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65Dart: those flow #'s are'nt off of my flowbench so, comparing them directly to these magnums is kind of tough. Here are some #'s off my bench if you wnat to compare:

From left to right: Magnum, Full port 2.02 "587" J head that has ran 11's, Edelbrocks I did for Coke Bottle Kid, and a set of Large port Commando's I just did.

LIFT--MAGNUM---"587"----EBROCK----COMMANDO
.100"--67.3-----62.1-----65.6------69
.200"--132.8----135.2----135.2-----140.1
.300"--196.0----198.7----197.7-----202.5
.400"--225.0----239.8----233.2-----246.4
.450"--238.1----253.9----245.0-----266.0
.500"--250.5----258.4----255.3-----277.1
.550"--257.1----264.9----265.7-----281.2
.600"--259.1----254.6----274.6-----282.9
.650"--259.1----N/A------279.1-----283.0
.700"--259.8----N/A------283.9-----285.3

In all fairness to the Magnum, all 3 other heads have 2.02 valves..... and the "587" J heads are the best low/mid flowing J heads I have ever done, so that is kind of misleading. They just ended up being a REALLY good set of heads. And you can see why IMO the Large Port Commandos are such a great head for the $.

For a more "fair" comparison, here is "Valcuda"'s "596" J heads with full port work and 1.88 Tulip valve next to the magnum:

LIFT--MAGNUM---"596"
.100"--67.3---58.7
.200"--132.8--120.1
.300"--196.0--182.9
.400"--225.0--225.6
.450"--238.1--238.1
.500"--250.5--241.5
.550"--257.1--247.0
.600"--259.1--248.8


And I'm not even going to bother listing race heads as that is comparing apples to oranges. I'll just say, a W-5 has absolutely KILLED every other race head other than a W-8 that has been on my bench.

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