Ported Stealth Heads

[comet_666]

Has anyone used these from 440 Source at all?
Thoughts on them?

[Canadian1968]

Search button....................

[comet_666]

Let me clarify,
Has anyone used these from 440 Source at all LATELY?
I know they were going through some changes in the design 5 or 6 years ago? Does anyone have any real world experience in the past year?
And Canadian1968 don't be a pud  I did do a search...did you? Were your results from 2008?

[Canadian1968]

Sorry but your question was very vague . I do know there is a ton of info on here about the heads. As well as all over the net.There is even a thread in the "proven engine build" section ( lowly 440 build) this is recent build using the stealth heads with some mild porting and very detailed info.

I know they now suggest upgraded locks and retainers right on their site ,due to problems in the past . And the new super stealth head has had good reviews .

What exactly are you looking for ? What changes did you hear about? Your wondering if quality has changed ? You want actual flow numbers ?

[comet_666]

Basically I am looking to try them on my 512 stroker kit from 440 source, A friend built his 512 with un-ported stealth heads and was at 540hp/600+tq. Just wanted to see if anyone has recently tried them because I also heard they fixed the issues they had years back.

[don duick]

I installed a new set that were bought about one year ago. So far have done about 2000 miles no problems so far. I did throw out the springs locks and retainers and replaced them with comp cams parts instead. Also had the valves pressure tested they were fine. 
You mentioned ported, are you referring to the Super stealths ? they are a different casting with larger straighter ports that require offset rockers.

[comet_666]

No just the regular cnc stealth heads. curious what type of power advantage over stock stealth?

[mhinders]

No just the regular cnc stealth heads. curious what type of power advantage over stock stealth?

I think I've seen (maybe @moparts.org) some flow numbers for the CNC ported Stealths, seem to remember it may be worth the money if you need the additional power.
I have the standard Stealths, about 1 year old, they needed some cleaning in the ports but overall good heads I think.

[comet_666]

From what I read about 60 hp or so over standard stealth heads on a mild 440

[Challenger340]

Just my opinion... but I would not even THINK about using un-ported Stealths on a 500" Engine... little-lown a 512 ?
Unless you just want a truck engine to shift at 4,000 rpm ?
The "stock" ootb port is bound to fawk-up and go sonic under the larger Stroker Engine demand, which can create a whole host of weird and unexplained tuning / detonation problems.
GET THEM PORTED or BUY the CNC Heads for Strokers !
Even then... depending upon Camshaft... you are still pretty much out of Air by mid 5,000's rpm wise.

[comet_666]

My boss built a 512 with un-ported heads and made 520 Hp and 607 Tq on the dyno. Who knows how it will actually run in the car. But I agree, I think ported is the way to go.

[Challenger340]

My boss built a 512 with un-ported heads and made 520 Hp and 607 Tq on the dyno. Who knows how it will actually run in the car. But I agree, I think ported is the way to go.

It would be very nice to see the Dyno Sheets... as it relates to "where", or "what rpm" the 520 occurred at on the 512.... and how fast the power curve drops off ?

512's are Great Torque monsters with un-ported Stealths, but IMO, leave it in "D" with an auto to upshift by itself at 4500 rpm, and forget a 4 spd application all together because the power curve has no legs = NO Fun !

[68charger440]

So let me re-stir this pot...
Comet_666, did you ever go with the Stealth CNC ported heads?  I also heard that they have fixed the issues and are ok now but I would like to hear some more success stories.  I have a 500" 440source lower end that is 8 years old and still going, so at least some of their stuff is ok.  I am toying with getting the CNC ported stealth heads too.

[68charger440]

So is the topic of the CNC ported Stealth heads still so toxic that no one wants to touch it?  I would think by now there would be some people who have had these in use for a couple of years and could say if they have cleared out the earlier problems or not.

[BSB67]

It is hard to imaging choosing a CNC ported Stealth over the TF head.  The CNC Stealth will be fine though, IMO.

[303 Mopar]

So is the topic of the CNC ported Stealth heads still so toxic that no one wants to touch it?  I would think by now there would be some people who have had these in use for a couple of years and could say if they have cleared out the earlier problems or not.

I have a buddy with these ported heads on his 383 '70 Challenger and it runs like a raped ape.

[68charger440]

It is hard to imaging choosing a CNC ported Stealth over the TF head.  The CNC Stealth will be fine though, IMO.

How do they flow as compared to the cnc Stealths?  Also, do they have the straight plug locations?  I am open to suggestions.  I am collecting as much input as I can right now before pulling the trigger.

[BSB67]

It is hard to imaging choosing a CNC ported Stealth over the TF head.  The CNC Stealth will be fine though, IMO.

How do they flow as compared to the cnc Stealths?  Also, do they have the straight plug locations?  I am open to suggestions.  I am collecting as much input as I can right now before pulling the trigger.

I will pass along what I have read/heard from others, as I have no personal information. The TF:  1) has smaller port volume but higher flows than MCH CNC ported head.  This is a double plus. 2) quality is one or two steps better than the others, but for the "I want it perfect" guy, you probably should have them inspected by a high end professional.  3)  have spring options that will probably fit your needs 4) combustion chamber (78 cc) is way smarter looking and designed than the others.

My opinion, unless you are head flow limited, and/or you want to make 550 +hp, the Stealth's, Eddy's, or Sidewinders still might be a better value.  If you think you need the power potential advantage of the CNC heads, TF has to be a serious consideration.

[68charger440]

It is hard to imaging choosing a CNC ported Stealth over the TF head.  The CNC Stealth will be fine though, IMO.

How do they flow as compared to the cnc Stealths?  Also, do they have the straight plug locations?  I am open to suggestions.  I am collecting as much input as I can right now before pulling the trigger.

I will pass along what I have read/heard from others, as I have no personal information. The TF:  1) has smaller port volume but higher flows than MCH CNC ported head.  This is a double plus. 2) quality is one or two steps better than the others, but for the "I want it perfect" guy, you probably should have them inspected by a high end professional.  3)  have spring options that will probably fit your needs 4) combustion chamber (78 cc) is way smarter looking and designed than the others.

My opinion, unless you are head flow limited, and/or you want to make 550 +hp, the Stealth's, Eddy's, or Sidewinders still might be a better value.  If you think you need the power potential advantage of the CNC heads, TF has to be a serious consideration.

Thanks...  I think am looking at around low to mid 500 hp range, but I'm not really sure.  Care to guess what I should expect with my 500" 10.5 cr stroker with those heads and the Crower hdp282 cam?  I think you have seen the outline of my build, but I can repost it if need be.

[68charger440]

I have a buddy with these ported heads on his 383 '70 Challenger and it runs like a raped ape.

Next summer we'll have to get together and cruise a little.  It would be fun to get a few of these old mopars on the road together here in Denver.  I don't see too many of them in the wild.

[firefighter3931]

Personally, I would go with the TF 240 head over a CNC ported Stealth. The TF will make more power and it is a better designed casting and the machine work & hardware is superior. 


Ron

[68charger440]

Personally, I would go with the TF 240 head over a CNC ported Stealth. The TF will make more power and it is a better designed casting and the machine work & hardware is superior. 


Ron

Then I will have to replace my headers to accomodate the angled plugs. As Rosanne Rosannadanna would say, If it's not one thing it's another.

[firefighter3931]

Personally, I would go with the TF 240 head over a CNC ported Stealth. The TF will make more power and it is a better designed casting and the machine work & hardware is superior. 


Ron

Then I will have to replace my headers to accomodate the angled plugs. As Rosanne Rosannadanna would say, If it's not one thing it's another.

Think of this as the perfect opportunity to optimize the combination. Anything less than a 2in primary tube header will be leaving power on the table with a 500in motor. The Dougs 2in headers fit great and will increase torque & horsepower. 


Ron

[myk]

I don't know heads from shinola, but those 2" Dougs fit like a glove...

[firefighter3931]

I don't know heads from shinola, but those 2" Dougs fit like a glove...

Yep, the Doug's headers fit just as nice as the TTI's and are a few hundred dollars cheaper. 

They work great with a stock port location angled plug cylinder head. 


Ron