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Stealth Head Flow vs pocket ported Iron #1201176
03/22/12 12:04 AM
03/22/12 12:04 AM
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GTX MATT Offline OP
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Do the stealths really flow that much more ootb than a typical set of pocket ported iron heads? I know 440source claims big numbers, but looking at flow numbers from the only reliable source I could find it looks like they really don't flow much more except for above .500 lift. Is this really the case?


Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
Re: Stealth Head Flow vs pocket ported Iron [Re: GTX MATT] #1201177
03/22/12 01:39 AM
03/22/12 01:39 AM
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Posts: 5,399
Aurora, Colorado
451Mopar Offline
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If you took the stock heads, replaced the worn valve guides for 5/16" valve stems, cut the seats for dual springs, installed the larger 2.14/1.81 valves, installed hardened seats for unleaded fuel, and then put at least 10 hours of porting into the heads, then they might flow as well as the stealth or RPM heads, but they will still have the open chamber design, and weight alot more than the aluminum heads. If you put alot of porting work into the iron heads, they can even flow better than the out of the box aluminum heads, but if they crack or get damaged, they are harder to repair.

Re: Stealth Head Flow vs pocket ported Iron [Re: 451Mopar] #1201178
03/22/12 07:31 AM
03/22/12 07:31 AM
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Holland MI Ottawa
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2boltmain Offline
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Currently the price to restore OEM iron heads to 100% stock approaches that of a new set of Stealths. Add in professional porting and the price will by far exceed that of a new set of Stealths and even a set of Edelbrocks.. Back in 1996ish a mopar mag featured Dick Landy Industries completely redoing some iron heads with oversize valves and a fantastic port and polish. The final cost BACK then was near 2 grand. That hand labor by a pro is $$$.


Keep old mopars alive.
Re: Stealth Head Flow vs pocket ported Iron [Re: GTX MATT] #1201179
03/22/12 09:50 AM
03/22/12 09:50 AM
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JohnRR Offline
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Quote:

Do the stealths really flow that much more ootb than a typical set of pocket ported iron heads? I know 440source claims big numbers, but looking at flow numbers from the only reliable source I could find it looks like they really don't flow much more except for above .500 lift. Is this really the case?




Well you saw the ACTUAL results from a trusted source so YES this really is the case.

The two people above me are expanding the question with an answer to something you didn't ask about ... COST ...

Some people either HAVE TO or WANT TO run stock iron heads, for them cost is not really a factor. If rules dictate it, you either follow the rules or do something else.

Re: Stealth Head Flow vs pocket ported Iron [Re: GTX MATT] #1201180
03/22/12 12:02 PM
03/22/12 12:02 PM
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NORTHERN VA
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THESHAKERPROJECT Offline
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Quote:

Do the stealths really flow that much more ootb than a typical set of pocket ported iron heads? I know 440source claims big numbers, but looking at flow numbers from the only reliable source I could find it looks like they really don't flow much more except for above .500 lift. Is this really the case?


......Well yes they flow ALOT more than a set of 346/452 heads OTB and about 20-30 cfm more than a set of stock 906 heads (intake) but I have a set of ported, biger valve 906 heads that flow quite a bit better at low/mid lifts and 20cfm better at .500 than OTB stealth heads but I have about $1600 in them. The Stealt heads were not aval at the time of my build. All flow data was from the same flow bench.
I have a set of ported stock valve 346 heads that flow 270CFM @.500 but also cost $1500 in porting/machine/assembly ect on a FAST type sixpack build. You can make the stock stuff flow but it cost $$$. The stealth heads with bowl blending and minor port work will flow better than most ported factory heads and you get the better chamber as well.

Re: Stealth Head Flow vs pocket ported Iron [Re: THESHAKERPROJECT] #1201181
03/22/12 03:07 PM
03/22/12 03:07 PM
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GTX MATT Offline OP
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THANK YOU JOHN. I appreciate the advice guys but I'm not asking which is cost effective, I just want to know what the Stealth's actually flow out of the box, and they seem further off of the Eddys than I had first thought.


Now I need to pin those needles, got to feel that heat
Hear my motor screamin while I'm tearin up the street
Re: Stealth Head Flow vs pocket ported Iron [Re: GTX MATT] #1201182
03/22/12 05:48 PM
03/22/12 05:48 PM
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Posts: 5,746
Ontario, Canada
Dodgem Offline
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My guy with a flow bench got 244 OOTB on the stealths. I ported and polished them good not to the max but good and got 285. think he gets 268 ish on Eddy's OOTB.

A set of eddies I ported got 300.

I think 906/452's get about 220 stock!

Re: Stealth Head Flow vs pocket ported Iron [Re: Dodgem] #1201183
03/22/12 06:34 PM
03/22/12 06:34 PM
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JohnRR Offline
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Quote:

My guy with a flow bench got 244 OOTB on the stealths. I ported and polished them good not to the max but good and got 285. think he gets 268 ish on Eddy's OOTB.

A set of eddies I ported got 300.

I think 906/452's get about 220 stock!





I have a set of bowl ported 906's done by fast68plymouth that only cost $300 in 2006 to get them to this, they had a bad competition valvejob done by another shop that made them flow worse than stock .

This is on his OLD bench

lift----I/E
.100--69.0/51.1
.200-146.4/99.7
.300-212.2/131.8
.400-246.7/161.2
.450-246.7/166.1
.500-251.5/170.9
.550-251.5/175.8
.600-249.9/179.4

Re: Stealth Head Flow vs pocket ported Iron [Re: JohnRR] #1201184
03/23/12 01:06 AM
03/23/12 01:06 AM
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo Offline
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The eddy vs 440source flow test fast68plymouth posted back when they first came out showed OOTB stealths to be about +/- 4% for intake flow cfm through the usual lift range. His opinion at the time was this was due to the source heads really needing the valve seat blended to the bowl.

Re: Stealth Head Flow vs pocket ported Iron [Re: GTX MATT] #1201185
03/24/12 05:46 PM
03/24/12 05:46 PM
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Posts: 559
Idaho
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LaRoy Engines Offline
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Idaho
Stealth vs factory 906 iron in different stages. The first two columns in each section are box stock and then pocket ported and then other columns are as the porting progressed. All flows tested on the same bench.

First the 906.

.100"....66.....78....86.....87....83.....72.....91
.200"...130...154...162...166...152...152...165
.300"...189...207...211...220...207...209...219
.400"...222...242...251...259...253...257...272
.500"...234...251...278...283...285...292...299
.600"...237...234...288...301...307...311...325
.700"...237...234...278...304...315...324...335

Now the Stealth

.100".....66....72.....88....83.....77....73
.200"...143...144...158...158...153...152
.300"...205...202...214...220...216...218
.400"...240...247...261...264...265...267
.500"...255...274...290...297...306...308
.600"...267...291...306...313...324...337
.700"...268...289...318...329...337...346

So to directly answer the question, the second column in the first section is pocket ported iron and the first column in the second section is box stock Stealth.

Re: Stealth Head Flow vs pocket ported Iron [Re: LaRoy Engines] #1201186
03/24/12 05:59 PM
03/24/12 05:59 PM
Joined: Oct 2011
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Idaho
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LaRoy Engines Offline
mopar
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Idaho
Rats, somebody is going to ask to compare the RPM to the Stealth. So here are the box stock RPM flows along with the fully ported flows.

.100"....71.....75
.200"...155...152
.300"...205...216
.400"...252...265
.500"...275...305
.600"...286...333
.700"...287...350
.750"...........354







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