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Re: Magnum R/T Heads........ Flow Results
[Re: BBR]
#3783
09/08/03 07:58 AM
09/08/03 07:58 AM
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Joined: Jan 2003
Posts: 2,155
Tucson, Arizona
clonestocker
top fuel
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top fuel
Joined: Jan 2003
Posts: 2,155
Tucson, Arizona
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Ryan, What kind of HP do you think those heads could support? matt s
[img] [/img]
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Re: Magnum R/T Heads........ Flow Results
[Re: clonestocker]
#3784
09/08/03 09:59 AM
09/08/03 09:59 AM
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Joined: Jan 2003
Posts: 7,131
Amarillo, Texas
BBR
master
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master
Joined: Jan 2003
Posts: 7,131
Amarillo, Texas
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For comparison's sake:  LIFT--R/T AC--------R/T PRTD----MAG PRTD---"596"---"587"---EBRK---COM---W2AC*--W2PRTD*--W5PRTD* ---------IN/EX----------IN/EX .200"--135.6/110.4---148.4/111.8---132.8/115.6---120.1---135.2---135.2----140.1----121.7-----127.2------146.6/102 .300"--194.9/154.9---208.7/155.3---196.0/156.6---182.9---198.7---197.7----202.5----181.7-----184.1------210.5/145 .400"--227.4/173.5---243.2/189.1---225.0/172.2---225.6---239.8---233.2----246.4----228.9-----232.1------262.9/204 .450"--233.9/177.3---252.5/194.6---238.1/174.3---238.1---253.9---245.0----266.0----248.1-----254.5---------N/A .500"--239.4/179.4---255.6/197.7---250.5/176.6---241.5---258.4---255.3----277.1----262.5-----273.7------301.9/220 .550"--244.9/180.8---259.1/199.8---257.1/178.0---247.0---264.9---265.7----281.2----268.9-----289.7------309.1/224 .600"--245.0/181.8---268.4/201.2---259.1/180.8---248.8---254.6---274.6----282.9----265.0-----302.2------315.7/229 .650"--245.0/181.8---276.0/203.2---259.1/180.8---N/A----N/A-----279.1----283.0----253.2-----302.2------315.7/231 .700"--241.5/183.2---281.2/203.2---259.8/180.8---N/A----N/A-----283.9----285.3----249.8-----280.0------312.2/232 * taken from Shady Dell Speed Shop site AC = As Cast PRTD = Ported
Drag Week 2011 - 77th place - DD
Drag Week 2012 - 2nd place SRBB N/A
Drag Week 2014 - Kapooya
RMRW 2018
RMRW 2020
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Re: Magnum R/T Heads........ Flow Results
[Re: d4rt]
#3785
09/08/03 12:18 PM
09/08/03 12:18 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
The as cast exhaust flow is off the charts at 0.600"!  268.4!  
that was ported....
you read my mind Ryan, well, it's kinda nice to see intake port CC comparisons, too to get an idea of port velocity, especially if one is using these on a small motor (:
I assume you used a 4" bore plate? are the exhaust numbers without a flow tube?
horsepower? if you're using a cam in the .600" lift range, I'd say you'd support ~550 max HP.
ryan- you also forgot to mention magnums have a 1.6 ratio rocker standard
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Magnum R/T Heads........ Flow Results
[Re: patrick]
#3787
09/08/03 12:51 PM
09/08/03 12:51 PM
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Joined: Feb 2003
Posts: 696
AZ
d4rt
mopar
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mopar
Joined: Feb 2003
Posts: 696
AZ
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Quote:
Quote:
The as cast exhaust flow is off the charts at 0.600"! 268.4!
that was ported....
I was just giving Ryan a friendly ribbing for a minor typo. The 268.4 that is the ported intake flow at 0.600" was over in the exhaust category with the "as cast" numbers. He seen it and fixed it. All is good.  Once again those are some impressive heads. Both as cast and ported. Wish my E-brocks flowed like that out of the box.
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Re: Magnum R/T Heads........ Flow Results
[Re: patrick]
#3788
09/08/03 12:59 PM
09/08/03 12:59 PM
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Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
OP
moparts member
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OP
moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
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Quote:
you read my mind Ryan, well, it's kinda nice to see intake port CC comparisons, too to get an idea of port velocity, especially if one is using these on a small motor (:
I assume you used a 4" bore plate? are the exhaust numbers without a flow tube?
I never flow exhaust with a tube, well OK, a few times and when I do I will ALWAYS mention the #'s are with a tube. Only times I want to flow with a tube, is to get a better idea of true percentage of exhaust flow for cam selection.
Yes 4" bore.
Still Hav'nt CC;'d it yet LOL. I know I'm lazy..... either that or I just find CC'ing heads is a PITA LOL.
Volume does'nt always tell EVERYTHING about velocity. Look at a W5.... Large runner (~215-220 CC ported), and probably has best velocity across the short turn of any SB head out there (59*) You can tell this head has good velocity by the Low lift #'s it put up. Generally it takes big velocity to make big #'s at low valve lifts.
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Re: Magnum R/T Heads........ Flow Results
[Re: RyanJ]
#3790
09/08/03 03:11 PM
09/08/03 03:11 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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Quote:
Still Hav'nt CC;'d it yet LOL. I know I'm lazy..... either that or I just find CC'ing heads is a PITA LOL.
Volume does'nt always tell EVERYTHING about velocity. Look at a W5.... Large runner (~215-220 CC ported), and probably has best velocity across the short turn of any SB head out there (59*) You can tell this head has good velocity by the Low lift #'s it put up. Generally it takes big velocity to make big #'s at low valve lifts.
true about the port volume, but generally speaking, if you have a port flowing 240CFM with a 165cc port and a port flowing 240cfm with a 220cfm port, it's pretty easy to figure out which port will yield crisper throttle response and overall streetability. no biggie, although it will be curious to see if these things are alot larger than a standard magnum. anyone know how the aluminum magnum heads compare to the stock iron and R/T's?
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Magnum R/T Heads........ Flow Results
[Re: clonestocker]
#3791
09/08/03 03:21 PM
09/08/03 03:21 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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boxcar, I'm curious, when I checked the 3 set of magnum rockers I have here (at the valve) I get more like 1.56 to 1.57 average ratios, I am assuming you are just checking the pure rocker ratio to get your rather high figures? And that the severe lifter angle and the higher than rated "rocker" ratio cancel each other out and net about a 1.6 at the valve???? Just trying to sort out all the different info out there floating around about the magnum heads/valve gear, it seem like everyone I talk to tells me something different 
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Re: Magnum R/T Heads........ Flow Results
#3792
09/08/03 04:51 PM
09/08/03 04:51 PM
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Joined: Jan 2003
Posts: 7,131
Amarillo, Texas
BBR
master
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master
Joined: Jan 2003
Posts: 7,131
Amarillo, Texas
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OK what about cam recommendations? I'm thinking a fast ramp hydraulic like a Hughes or Comp XE.
These heads
3.58" stroke cast MP crank
9.5-10.0 compression
Performer RPM intake
Holley 3310
3.91's
'68 B body
3800 converter
Drag Week 2011 - 77th place - DD
Drag Week 2012 - 2nd place SRBB N/A
Drag Week 2014 - Kapooya
RMRW 2018
RMRW 2020
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Re: Magnum R/T Heads........ Flow Results
[Re: BBR]
#3793
09/08/03 05:57 PM
09/08/03 05:57 PM
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Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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you looking for streetable manners, good vacuum? what block?
since you're making a stroked 'teen, I'd look at an '85 up block and a hughes HER2836AL roller, meeself, maybe the HER3644AL, if you want an off the shelf grind, and reuse the stock lifters. the wide LSA should give decent idle/vacuum at idle. or contact scott brown for a roller cam.
if you're using an older block, and you want good street manners, comp XE268 or XE275HL, or a hughes HEH 2328 AL or HEH 2832 AL for off the shelf, or again call scott brown at straightling performance.
1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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Re: Magnum R/T Heads........ Flow Results
[Re: TC@HP2]
#3795
09/08/03 07:14 PM
09/08/03 07:14 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
Ya know, after seeing so many people slamming MP for parts quality, it is real nice to see a post about something they have not only done right, but exceeded expectations on.
Totally agree here!
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Re: Magnum R/T Heads........ Flow Results
[Re: patrick]
#3796
09/08/03 10:24 PM
09/08/03 10:24 PM
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Joined: Jan 2003
Posts: 7,131
Amarillo, Texas
BBR
master
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master
Joined: Jan 2003
Posts: 7,131
Amarillo, Texas
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Good street manners need not apply. No vacuum accessories on this car. Manual brakes, manual steering, no AC, etc.... This is my fun car that I drive some on the street, but like to take to test-n-tune / grudge racing almost weekly. I can deal with some not so friendly street manners to have great straight line performance. This is a 68 block, and, so far, I don't really want to do the roller thing. Although, it doesn't seem like a big deal to put roller lifters into an old block though. Just need 3 holes drilled and tapped in the lifter valley to hold the lifter retention spider. Heck you could probably JBWeld some bosses in there to do that. Unless there are differences I don't know about. (wouldn't be surprised.) -James
Drag Week 2011 - 77th place - DD
Drag Week 2012 - 2nd place SRBB N/A
Drag Week 2014 - Kapooya
RMRW 2018
RMRW 2020
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Re: Magnum R/T Heads........ Flow Results
#3798
09/09/03 04:51 AM
09/09/03 04:51 AM
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Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
4speeds4me
master
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master
Joined: Jan 2003
Posts: 8,089
Sorrento, BC, Canada
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Quote:
Quote:
Ya know, after seeing so many people slamming MP for parts quality, it is real nice to see a post about something they have not only done right, but exceeded expectations on.
Totally agree here!
Me too...with a caution...This isn't the only thing MP has done right, but quality control has a tendency to SUCK! Joe Blow buys a Crate motor and it's got so many issues it has a standing offer from the Jerry Springer Show, and then Joe Schmo buys one and it runs so hard he's winning races like there's no tomorrow.
I really hope these heads don't turn out to be another one of those cases...
2 Demons...no, not my kids! 
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Re: Magnum R/T Heads........ Flow Results
[Re: AndyF]
#3801
09/09/03 12:21 PM
09/09/03 12:21 PM
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Joined: Jan 2003
Posts: 8,547
State College, PA
RyanJ
OP
moparts member
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OP
moparts member
Joined: Jan 2003
Posts: 8,547
State College, PA
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Quote:
Sounds like a good head. So a couple of questions: There doesn't seem to be a lot of Magnum intake manifolds on the market so isn't that drawback to using these heads?
Also, given the intake limitations, is this head a better head for a stout street small block than the large port aluminum commando heads?
Large Port Commando is still my favorite "street" type SB head. It is head and shoulders above everything else in terms of flow and quality of casting. Only drawbacks it has are the W2/5 race rocker setup and they are more $ than a Magnum R/T or a set of E heads.
OH and here are the new #'s hot off the flowbench, on the left is the intake #'s from before and on the right is a mirror port with the short turn layed back more as I had discussed previously.....
LIFT----OLDPORT-----NEW
.200"---148.4-----137.3
.300"---208.7-----202.5
.400"---243.2-----242.2
.450"---252.5-----248.4
.500"---255.6-----256.0
.550"---259.1-----265.0
.600"---268.4-----273.3
.650"---276.0-----279.1
.700"---281.2-----285.7
.750"---N/A-------288.8
Did exactly what I expected, lost low lift and traded it for gains in the high lift.
I'll be sticking with my original short turn shape on the next 6 cylinders.....
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