KyleDallas

I just looked at the Dart Iron Eagle Platinum Head Flow chart...
These are some of the most powerful iron heads currently
available..they also out flow many Aluminum heads... a stunning
improvement from the often "also ran" Dart's. Go to the link for the
complete chart.

200cc Runner- Dart Iron Eagle Platinum Heads- Cast Iron 64cc chamber
*
Lift............ Int/cfm........Exh/cfm
.400.......... 242.............178
.500.......... 274.............195
.600.......... 284.............205

link:
http://www.mbeperformance.com/docume...20Platinum.pdf

KyleDallas

In comparison the LT4 Corvette head... one of the Generals best
ever.. flows

243 cfm @ .400 lift
265 cfm @ .500 lift

a little cam, stroke, and attention to detail and hello 500hp..

INMYBLOOD

How much ????????

KyleDallas

Looks like Jegs has them for about $670 for a pair... bare in the
200cc port ..... LT4's are 195cc port... so pretty much an apples to
apples comparison with the Iron Eagle Platinums vs. the LT4's..

Racepartsdirect.com has really good prices...they can probably beat
Jegs but they don't have them priced on their online catalog...
Racepartsdirect usually beats their competitors by $20 to $100 bucks..
and they do carry Dart products.

Cris

Wow, those are very nice numbers. I’d like to see some independent testing though.

To put those numbers in perspective, the new AFR 195cc “Eliminator” “Race Ready” heads flow 137, 194, 240, 270, 286 at .2, .3, .4, .5, and .6” lifts. AFR’s “Competition” version of that head flows 140, 202, 248, 280, 300 at the same lifts.

I have a set of the Competition heads on order from AFR, no delivery yet, but I will flow them and post the results when I finally get them.

KyleDallas

Those are independent numbers... not Dart's..MBE did the testing..

C64BOB

Are these unported? My experience with Dart SBC heads is that the exhaust ports, unported, are junk and hard to make work.

KyleDallas

I agree with your Dart misgivings.... these are an all new design
New Chambers... New Ports
they are called the PLATINUMS

Iron Eagle Platinums... 200 cc port

they are different than the standard Iron Eagles...

AFR came out with their Eliminator series not too far back... I guess
Dart figured they better respond.... looks like they did.
I was never a big fan of the standard Dart Iron heads...

Dart has been kinda lazy for a while... where their flow numbers are
concerned... looks like they are coming up to speed.

Cris

Kyle:

Are these heads assembled by MBE? (Is MBE tweaking them?) Or are they fully assembled, direct from Dart?

Pretty cool that the 23 degree heads are flowing numbers approaching good LSX heads.

KyleDallas

My guess.. pure guess.. is that they are available
1. Bare
2. Assembled by Dart
3. Assembled by MBE or any other Performance Sales/Shop

I think it's sad Dart has taken so long to bring good heads to market
..... while Im happy about these heads, I am still not completely sold
on their good will in being a major horsepower player as opposed to
providing just some OK building blocks to take to a head porter.

Time will tell.... the technology to achieve good flowing heads
right out of the box has been available for years and years...
they could have done this 10 years ago...

KyleDallas

Good News... and Bad News... first the good news.. check out the flow
numbers on these Dart Iron Eagle PLATINUM 200cc heads...


Now the bad news.... M2, the company that ported these, wants $2000
for their porting service... it cost less to port aluminum because it's easier
to grind through than cast iron..

Cris

Kyle:

The ported numbers look very similar to the new AFR 195's (comp version). Maybe the head guys have all discovered the same thing.

Also interesting to note that M2 is measuring the uported heads lower than the numbers Dart is reporting. Of course M2 has a vested interest to show how good their porting is.....and how bad the heads were when they started porting.

KyleDallas

I agree Chris... I think some clarification would be needed by M2..
I am wondering if their "stock" numbers are for another Chevy head..
because the stock numbers they have-have the head flowing less cfm than a Vortec L31 ..... It just doesn't make since that Dart would put out
a new head that flows less than a bone stock 1997 Silverado 350
head... something is wrong..

I did do some checking around the MBE site... it turns out the
owner has done head work for Joe Gibbs Racing, Ray Everenham,
and Top Fueler Connie Kallitta.

I looks like they do both hand and CNC porting work at MBE..
MBE is currently doing work for some NASCAR teams... and they are
located in NASCAR country.... Mooresville,North Carolina.
I think MBE would be a good source for head information and work..

skooch around their site if you get a chance..

http://www.mbeperformance.com/

6T5RUSH

KyleDallas,

Had to respond to this as I have those run of the mill Dart Iron Eagles (180 runners) that have been ported/polished. The shop that did the work did have my ported '461's to compare when they flowed both sets of heads.

Here are the comparisons on these cast Iron Eagles to the '461's:

I'm providing the roughed out paper by Modern Cylinder Head but I'm also going to key the #s in here for the sighted challenged as a thread on head flow back a few months ago was comparing the AFR heads to the factory '461's and I hand notated the AFR's to Modern Cylinder Head's sheet here also.

Here ya go:

Modern Cylinder Head's sheet:



Under each head description: Intake/Exhaust CFM flow

%
Over
Lift 461's Dart Iron Eagles 180's '461 AFR 180's

.10 65.0/48.2 68.4/62.0 5/29 N/A
.20 126.0/89.6 144.5/108.5 15/21 140/112
.30 173.7/126.0 200.6/158.0 15/25 201/152
.40 202.9/142.4 237.8/193.1 17/36 244/190
.50 210.4/150.8 252.3/200.6 20/33 266/208

following #s above .5 lift are shown just because the shop flowed 'em but I believe for a street motor these lift #s are probably academic but she's flowin:

.55 211.0/152.4 257.4/201.9 22/32 262/214
.60 214.0/153.6 260.1/202.8 22/32 263/219
.65 214.0/154.9 262.3/203.7 23/32 N/A
I submit this as these Dart Iron Eagles, professional ported, do flow well. Had these head on my '5 since July, '04. They do work for me.

Just a happy camper with Dart Iron Eagles.

Regards,

Jim

Sorry guys on the alignment of these #s as displayed. When I look at it in edit everything is aligned not truncated like you see. Apologize

KyleDallas

Hey Jim.... Those Standard Darts did turn out pretty well with the porting job .....congratulations.. I'm doing some more scouting around trying to
nail down the out of the box flow on the Platinums... it would be nice
to have several sources in near agreement on the out of the box flow..
And thanks for posting the flow on your ported 461's... that will help
some of the stock headed guys get a rough idea on their head's performance.

KyleDallas

Eureka..
I just found another site listing the Dart Platinum 200cc flow numbers out of the box.... and they compare favorably to the MBE Performance
chart.

Dart Platinum 200cc Cast Iron Stock
Lift ...................Int.........Exh...
.300................194cfm.....158cfm
.400................242cfm.....198cfm
.500................274cfm.....208cfm
.600................283cfm.....214cfm

Best price I've found so far is $329.99 each- Bare
that's $660 a pair...at Competition Products
http://www.competitionproducts.com/

6T5RUSH

KyleDallas,

Thanks! Your point is well taken though. Shopping for "out of the box" heads that flow big time without spending a fortune in precision machine work makes a lot of sense. Hopefully, the info you and I have provided here will help those guys on the fence about spending money on '461's or buying bolt-on improvements like these Platinums.

Regards,

Jim

dmentzer

The only problem with the platinums is they are 200cc. Not what I want for my 327. Now if they would make them in 180cc, that's a different story.

AZDoug

And of course, what does all this really mean to us 5.5 liter and less engine owners?

A 327 will only suck 327 CI of air at best, every revolution with no heads on it at all.

Except for maybe some tuning peaks where you get the headers and manifold to perform at above 100% VE, why would we need massive flow capability?

if a decently massaged engine averaged 90% VE across a fairly wide band range and only requires 140 CFM per port to achieve 100% VE but is only pulling 125 CFM, why do we need 260 CFM capability?, or does the doubling of the airflow capabilty just get us the extra 10% flow so we are at or near 100% VE?

Doug

KyleDallas

Dmentzer..... didn't you want a reason to try the new 383 Small Journal stroker kit from Speed O Motive?? See, tell your wife/girlfriend you had to get the stroker kit to go with your heads..


I agree that is just a hair more port size for a 327 than we normally see..but running AFR 195cc ports is quite common on 350's... and as I mentioned the LT4 (350) had 195cc ports...

Do you think it's too large to make work effectively?? I think your
concerns are valid.
The port cc's did have me a little uncomfortable using them on
a 327....but then I wondered " What if I spent some money getting the
top flight Childs & Albert ZGS rings.... and improved my piston seal.. would my intake draw signal close the gap on a mediocre sealed 350??"

I think this is a fair question...

I also have some numbers on the Bowtie Vortec Iron heads that come
in 185cc and 215 cc..... McLaren Performance, who developed the
Bowtie Vortecs for GM Racing tested both of those heads on a
ZZ4 shortblock.... and really 215's are too big, I think.. for a ZZ4
350... Maybe we can draw some armchair ideas from that mismatch of port CC's and Cubic Inches..here's the link on the Vortec Bowties-

http://www.superchevy.com/technical/...tec/index.html


the flow charts for the Vortecs is on page 2 of the article... the
185cc Vortec/Bowies don't flow as well as the Dart Platinums... but
match up a little better port size wise to the 327.. they are $554.00
a pair BARE at GM Parts Direct.

I really would like to see a dyno sheet on a 327 with excellent sealing
and the Dart Platinums... it would be interesting to see how the
combination faired.