440 source heads

440 source heads DEFAULT

To Port or Not to Port - Stealth Fighter

| How-To - Engine and Drivetrain

Do you remember a time when owning a Mopar vehicle meant not being able to find economically-priced aftermarket parts to make your car or truck faster? We sure do, and if it weren't for the fact that Mopars ran so good in stock form, we may have succumbed to the temptation to buy an off-brand car simply because there were an abundance of parts available. Things have changed however, and now is a good time to be a Mopar enthusiast. Mopars have come into style over the past couple of decades, and the aftermarket has responded with an abundance of go-fast goodies for Pentastar owners. There are literally thousands of parts available for just about every popular body style and engine, and prices for these parts have come down significantly.

When it comes to a car's performance the engine is the first part that comes to mind for most of us, and Chrysler manufactured some of the best engines in the industry to power their muscle cars. Of all the engines produced by Chrysler, the big-block was the most widely installed in performance vehicles, and in terms of torque, horsepower, and reliability is one of the best choices for a Mopar. One area that is an Achilles heel of the 440, however, is the cylinder heads. Stock 440 heads just don't allow enough flow for serious performance, and stock 440 heads are all made from cast-iron, making them heavy as well. Fortunately, 440 Source has an economical alternative to stock 440 heads with their Stealth line of aluminum replacements.

Aside from the other performance advantages, aluminum cylinder heads offer the distinct advantage of weighing some 40-50 pounds less than comparable cast-iron heads. The Stealth head also offers a closed chamber design for maximum quench area in the combustion chamber, and better intake and exhaust flow than any factory 440 cylinder head. The Stealth heads are also a direct replacement for the popular "906" casting factory head, are dimensionally the same, and utilize the same rocker gear and pushrods. These big-block heads are also, well, "stealthy" as they look identical to factory heads if painted. The best feature of the Stealth heads, however, has got to be the price. In stock, unported form, these heads come fully assembled with valves, springs good for a .600-inch lift flat-tappet camshaft, retainers, and locks for the surprisingly low price of $995 per pair.

With such a low price these heads are very cost effective, as you'd likely have this much (or more) money wrapped up in rebuilding factory heads by the time you installed stainless steel valves, new valve springs, and paid a machine shop to perform a valve job and replace any guides or seats that were excessively worn. To test the performance of the Stealth heads, we decided to bolt a pair of these on the 440 we built and dyno'd in the May 2012 issue, to see how well they compared to the 915 casting heads we already had on our big-block. The 915 heads offer a similar combustion chamber design, so compression ratios between the two heads will be very similar. While we're at it, we'll also bolt a pair of 440 Source's CNC ported Stealth heads onto our engine, and let you know how much power we gain with a ported version. The CNC ported versions of these heads cost an extra thousand dollars, but for large displacement street or race engines this extra cost could be worth the money.

The 440 we're using to test these heads is one we built on a budget in the April issue of Mopar Muscle. With a standard bore and stroke, just over 10.0:1 compression, Speed Pro forged pistons, and a Comp flat-tappet camshaft, this engine is typical of what many readers would build for their Mopar. The 915 heads on this engine are typical, built with a small amount of bowl cleanup, a multi-angle valve job, Comp valvesprings, and gasket matched intake and exhaust ports. These are not all-out "race-prepped" heads, just typical cleaned up and freshened factory castings. On the dyno at Auto Performance Engines (APE), this 440 made 460 horsepower and 466 lb-ft of torque using a Mopar Performance M1 intake and 950 cfm Holley Ultra HP carburetor, and once we bolted on a 1050 cfm Dominator, our 440 achieved a best pull of 467 horsepower and 469 lb-ft of torque. Using this pull as a baseline, we decided to bolt on our unported, out of the box Stealth aluminum cylinder heads and then a CNC ported set of Stealth heads to see how they compared.

Even without dyno gains, the Stealth cylinder heads have an advantage simply by being made from lightweight cast aluminum. Better yet, the weight savings is seen at the front of the car, where it matters most. Before bolting the heads on our 440, we ran all three sets of heads across the flow bench at APE. As expected, the mildly-worked factory 915 heads showed the least amount of flow, with the un-ported Stealth heads showing an improvement, and the ported Stealth heads showing the best flow at 323 cfm on the intake side and 271 cfm of exhaust flow.

On the dyno, the results showed exactly what the flow charts showed. By bolting on the "out of the box" Stealth heads and changing nothing else, our 440 street engine picked up power across the board, with peak horsepower climbing to 475 hp, and peak torque to 480 lb-ft. The average numbers of torque and horsepower were also up significantly, a clear indication that the $995 Stealth heads beat our factory 915 castings hands-down. Given that the 915 heads cost us $100 at a swap meet, and then were treated to a valve job, Comp springs, two valve seats, and all new guides, the Stealth heads become a better deal yet. Add stainless steel valves, the labor of port work, surfacing if needed, and the cost of our factory heads quickly not only meets, but exceeds the cost of the Stealth heads.

One area where the factory castings can't compete at all is the weight of the heads. No matter how much porting and cutting you do to factory heads you can't reduce their weight by the 40-50 pounds saved by using the aluminum Stealth heads. The other area where factory castings can't compete is with the flow numbers seen by the CNC ported Stealth heads. It would be nearly impossible to get the same flow from any factory cylinder head that we saw with the CNC ported Stealth heads, and the number of hours it would take to achieve numbers even close to the CNC Stealth's numbers would make the task cost prohibitive.

On the dyno, we had to utilize a different intake with the ported Stealth heads since the intake ports of the heads were taller than the runners of our M-1 intake manifold. To keep our comparison as close as possible, we utilized an Indy Cylinder Head single-plane aluminum intake we had on the shelf. This intake has approximately the same plenum volume as the M-1, with ports more closely matched to the ports of the ported Stealth heads. During our dyno session the CNC ported Stealth heads showed substantially more power than the unported versions on our relatively mild 440, and power numbers climbed to an impressive 532.1 horsepower and 483 lb-ft of torque. On a larger displacement or more race-oriented engine, we're sure the ported heads would have shown even more sizeable gains.

We learned a lot from out test of 440 Source's Stealth aluminum cylinder heads, and the results shown in the dyno sheets speak for themselves. Of course there are bigger, more exotic, and more expensive cylinder heads on the market for your big-block Mopar, but if you're looking for a lightweight, economical upgrade to factory big-block cylinder heads we found 440 Source Stealth aluminum heads to be a great option. Look over our dyno sheets carefully, and we think you'll agree that for the money, these heads are hard to beat. To see videos of our 440 making dyno pulls, be sure to log onto www.moparmuscle.com.

Price Tag
440 Source Aluminum Cylinder Heads$995 assembled
440 Source Aluminum Cylinder Heads CNC Ported$1995 assembled
915 Cast Iron Cylinder HeadsCost varies by parts used, repairs and machine work needed, and port work
Dyno testingVaries by shop (In central Florida: Call APE for a quote)
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200-1055Stealth Aluminum Cylinder Head - COMPLETE - SINGLE HEAD
Stealth Aluminum Cylinder Head - COMPLETE - SINGLE HEAD
For over a decade now, our STEALTH aluminum cylinder heads have been hands down the best bang for the buck you can find! Capable of an easy 550 horsepower (when used with our 500+ inch stroker kits) these have the potential to make 650-700+ horsepower with port work and upgrades.
In Stock
109-1514Bolt Kit - Cylinder Head 12pt.
Bolt Kit - Cylinder Head 12pt.
If you've got a big block Mopar engine and are looking for a set of new head bolts, these are just the ticket. For those who want strength and performance, but are still on a tight budget, these are the way to go. Priced at a fraction of the cost of the name brand bolts, these are custom made for us by one of the largest bolt manufacturers around. They feature reduced diameter 12 point heads for easy access in applications that have countersunk head bolts (such as our Stealth aluminum heads or Edelbrock Performer RPM heads), but they also work great with factory iron heads. Rated at 170,000 PSI, they are far stronger that the factory head bolts, or even a standard type grade 8 bolt. We even include .100" thick hardened washers with them. One set contains enough bolts for two heads (one complete engine.)
In Stock
112-1015Stealth Cylinder Head Gasket (Qty 1) - Black
Stealth Cylinder Head Gasket (Qty 1) - Black
Our new "Stealth" cylinder head gaskets are a perfect match for our Stealth cylinder heads. They come teflon coated, which allows for a perfect seal on engines which have dissimilar metals, such as an iron engine block with aluminum heads. Because aluminum expands at a rate much greater than iron, these two surfaces move against each other as the engine heats up and cools down. The teflon allows for this movement, making sure there will not be any coolant or combustion leaks, even during extended street driving. We've fully tested these at up to 12:1 compression. These fit all big blocks, all years. They are sold individually (one single gasket,) so be sure to order two if you need a set. Compressed thickness on these head gaskets is .051" The Teflon coating is designed to be installed dry, so no chemicals or sealers are necessary for installation. Just clean your deck surfaces (we recommend using laquer thinner for this), bolt 'em on and go. Although these are designed for our aluminum Stealth heads, they also work great with other brands of aluminum heads such as Edelbrock, Trick Flow, ProMaxx, etc and you can even use them on factory iron heads also.
In Stock
138-1000Champion Spark Plugs 3/4
145-1002Comp Cams
Comp Cams "Super Lock" 11/32" 10deg. Valve Locks
Shown here is our Comp Cams 10 degree "Super Locks." These are a huge, extremely beefy valve lock which has a wider angle of interference than a standard 7 degree lock. These are fully machined (not stamped) from a super tough fatigue resistant alloy. Comp recommends these for any cams over .460" lift (basically anything other than bone stock) but we feel they're absolutely necessary above .510" lift. These fit 11/32 valve stems, which can be found on most aftermarket aluminum heads (such as our Stealth heads or Edelbrock RPM's,) and they work great with our Comp "Super Lock" retainers, part number 145-1003 or 145-1006, which can be found on our Valve Retainers page. We highly recommend upgrading to these for extra insurance, and it's required if you will be running a cam over .510" lift. These are supplied in a set of 32, enough to do one complete engine. Since they're Comp, you can be assured of two things: They're 100% made in the USA, and the quality is second to none.
In Stock
145-1003Comp Cams
Comp Cams "Super Lock" Steel Retainers - Set of 16
Shown here is our Comp Cams 10 degree "Super Lock" Steel Retainers. These are a huge, extremely beefy valve retainer which is designed to fit our Comp "Super Locks," which can be found on our Valve Locks page. This 10 degree lock & retainer system has a wider angle of interference than a standard 7 degree lock. These are fully machined from 4140 Chrome Moly and finished in black oxide. Comp recommends these for any cams over .460" lift (basically anything other than bone stock) but we feel they're absolutely necessary above .510" lift. We highly recommend upgrading to these for extra insurance, and it's required if you will be running a cam over .510" lift. These are supplied in a set of 16, enough to do one complete engine. Since they're Comp, you can be assured of two things: They're 100% made in the USA, and the quality is second to none.
In Stock
101-1049All Teflon Valve Seals - 11/32
All Teflon Valve Seals - 11/32" stem / .530 OD guide
ALL TEFLON type seals, sometimes known as "PC" seals for Perfect Circle, one of the first companies to start selling them. These actually fit positively over the valve guide and "wipe" the valve stems as they open and close. These are an UPGRADED type seal which will fit our Stealth heads. They also feature a smaller diameter which is necessary when running dual valve springs. Sold as a set of 16 pieces, enough for one complete engine.
In Stock
HEADLABOR1Basic Cylinder Head Labor - R&R Valve Retainers & Locks
Basic Cylinder Head Labor - R&R Valve Retainers & Locks
This is a labor charge for us to remove and replace valve locks and retainers only, such as when changing from a 7 degree to a 10 degree setup. This basic head labor charge does NOT include replacing valve springs and seals, please select our extended head labor charge if you need valve springs and seals replaced also. This labor charge must be selected in the same order as the cylinder heads, along with the new valve locks and retainers you want upgraded. Does not include custom shimming each spring to a specific installed height.
In Stock
HEADLABOR2Extended Cylinder Head Labor - R&R Springs Seals Locks Ret.
Extended Cylinder Head Labor - R&R Springs Seals Locks Ret.
This is a labor charge for us to remove and replace valve springs, seals, locks and retainers. This labor charge must be selected in the same order as the cylinder heads, along with the new valve locks, retainers, seals and springs you want upgraded. Does not include custom shimming each spring to a specific installed height.
In Stock
127-1009Sheet Metal Valley Pan - RB Engine - Single Plane
127-1010Sheet Metal Valley Pan - RB Engine - Dual Plane
Sheet Metal Valley Pan - RB Engine - Dual Plane
This valley pan is the same as our single plain models, except it features a clearance well which will clear the exhaust crossover found in the Edelbrock Performer RPM intake manifold. It DOES NOT work with stock cast iron intakes, the Edelbrock standard Performer, or any others. These also work well with our aluminum Stealth heads, Edelbrock RPM heads, or any other aftermarket heads which feature an unbroken deck surface where the lower edge of the head's deck surface meets the edge of the valley pan. It will also work with factory cylinder heads, however there may be a small gap where the lower deck surface has a break which may need to be filled with silicone, depending on the intake manifold you are using. Because this pan is a single solid piece which fits "under" the cylinder head intake face edges, it requires at least one cylinder head to be off during installation or removal. Supplied in a gold irridite finish for good looks and corrosion resistance. This version fits the "RB" (413/426/440) engines.
In Stock
127-1011Sheet Metal Valley Pan - B Engine - Single Plane
127-1012Sheet Metal Valley Pan - B Engine - Dual Plane
Sheet Metal Valley Pan - B Engine - Dual Plane
This valley pan is the same as our single plain models, except it features a clearance well which will clear the exhaust crossover found in the Edelbrock Performer RPM intake manifold. It DOES NOT work with stock cast iron intakes, the Edelbrock standard Performer, or any others. These also work well with our aluminum Stealth heads, Edelbrock RPM heads, or any other aftermarket heads which feature an unbroken deck surface where the lower edge of the head's deck surface meets the edge of the valley pan. It will also work with factory cylinder heads, however there may be a small gap where the lower deck surface has a break which may need to be filled with silicone, depending on the intake manifold you are using. Because this pan is a single solid piece which fits "under" the cylinder head intake face edges, it requires at least one cylinder head to be off during installation or removal. Supplied in a gold irridite finish for good looks and corrosion resistance. This version fits the "B" (361/383/400) engines.
In Stock




Sours: http://store.440source.com/
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Re: 440 source stealth heads: GOOD?? BAD?? [Re: domingo] #712590
05/31/1005:44 PM05/31/1005:44 PM
Joined: May 2010
Posts: 207
warren, mich.

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dwayne welderOffline
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warren, mich.

depends on how much power you want to make. they look like 906 castings, only in aluminum. i haven"t flowed one yet, so not nowing how good they are.


Re: 440 source stealth heads: GOOD?? BAD?? [Re: Thor500] #712592
05/31/1006:11 PM05/31/1006:11 PM
Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_CoomerOffline
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Rock Springs
IMO they are a great replacement head, and mkae good power too. On the same note, I dont think they are a race head, and not a option in a race type appication....
Of coarse these are just my opinions.


[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

Re: 440 source stealth heads: GOOD?? BAD?? [Re: Thor500] #712594
05/31/1006:32 PM05/31/1006:32 PM
Joined: Jul 2004
Posts: 4,732
Watertown, WI
MikeyTOffline
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Watertown, WI

I really like mine, they work well and really flow well. I think I flowed 274 at .6 inch of lift out of the box, good numbers really helps my 440 breath.

Mike



1969 Dodge Dart Swinger

Re: 440 source stealth heads: GOOD?? BAD?? [Re: dOc 3.0 !] #712596
05/31/1006:42 PM05/31/1006:42 PM
Joined: May 2010
Posts: 207
warren, mich.

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dwayne welderOffline
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warren, mich.

[email protected] sounds like a good bowl ported, and gasket match set of 906. I woulden wast my money on cnc, porting on these heads period!


Re: 440 source stealth heads: GOOD?? BAD?? [Re: dwayne welder] #712597
05/31/1007:18 PM05/31/1007:18 PM
Joined: Nov 2004
Posts: 843
Suffolk,VA

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ireland383Offline
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Suffolk,VA
Had my machinist check them over and he was impressed. Bolted them on and . I probably could use a little more cam with them.

Re: 440 source stealth heads: GOOD?? BAD?? [Re: ireland383] #712598
05/31/1007:32 PM05/31/1007:32 PM
Joined: Feb 2007
Posts: 6,295
U.S.

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moparniacOffline
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use the search function for anything 440source related. people are tired of arguing over the overall quality that comes from there


Mopar Performance

Re: 440 source stealth heads: GOOD?? BAD?? [Re: Thor500] #712601
05/31/1008:36 PM05/31/1008:36 PM
Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_CoomerOffline
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Rock Springs
Quote:

Quote:

[Email][email protected][/Email] sounds like a good bowl ported, and gasket match set of 906. I woulden wast my money on cnc, porting on these heads period!



Modern cylinder head cnc's them, I think they know what there doing!



I know how they work, I purchased a set of Eddy's not long after they came out. The actually did check out OK for Use OOTB. Big heavy 69 Coronet totally stock suspension and gearing, bench seat went mid 7's in the 8th mile, so I know how they can work, seeing how they are direct copy's.
Im just saying they have cracking problems, I can only imagine cnc port work would make them much worse.
This isnt hear say, My best friend has a set on his mud truck, they are one season old...Both heads leak water like a sprinkler.
Im not saying he done everything correct with this engine, but I dont see Indy heads, or Edelbrock heads cracking under race conditions.
Thats all I am saying.....
great for a little street car, or daily driver, they wont go on anything that makes more than 500hp in my book.
They would get looked over, just like any other head for that matter.
Fact is the castings are not that great.
The material is soft. Valves, retainers and springs are junk, and wouldnt run these OOTB on one of my engines if they were offered for FREE..just to do this.
Im not trying to make this a 440 Source Bash fest.
Im just saying they are ment for a replacement head..They work well, and do work well even ported. But the casting problems and parts, and machine work can and do cause major problems....
Just the facts.


[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

Re: 440 source stealth heads: GOOD?? BAD?? [Re: Bob_Coomer] #712603
05/31/1009:02 PM05/31/1009:02 PM
Joined: Aug 2009
Posts: 1,887
Mooresburg, Tn

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'72CudaRacerOffline
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Mooresburg, Tn

I put a set on my 440 this year. So far so good. 3200 lb E body, 11.5" MT tires, SS leaf springs, 13.5+ comp, .590 MP cam. 60' 1.39, 6.59 1/8, 103+ MPH (in East Tenn hills, 1300 ft above sea level). Didn't get to put it on dyno, but works out to approx 585 HP?

Brian Dunnigan


6013502-IMG_0830.JPG(715 downloads)

Re: 440 source stealth heads: GOOD?? BAD?? [Re: Thor500] #712604
05/31/1009:09 PM05/31/1009:09 PM
Joined: Jan 2003
Posts: 6,254
Renton Washington

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Triple ThreatOffline
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Quote:

Thats the first instance I've heard of cracking. I'd like to think thats an isolated incident. My ootb set were from the first batch they sold.




I know of 3 or 4 people who have/had stealths. 2 of those people were making roughly 575-600 hp and both had issues with cracking. Heads were returned on both instances. Both now have Eddy's


-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA

Re: 440 source stealth heads: GOOD?? BAD?? [Re: domingo] #712608
06/01/1003:46 AM06/01/1003:46 AM
Joined: May 2008
Posts: 5,283
Aurora, Colorado
451MoparOffline
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I have a set for a future build and castings look really good. The springs/retainers should be good for a hydraulic cam with around 0.500"+ lift?
The pros of these heads:
#1 - They look like a stock head (no other aluminum head does.)
#2 - They fit like a stock head (straight plugs allow using manifolds or headers designed for stock heads. The angled plugs of the Edelbrocks can cause problems with headers not designed for the angled plugs.)
#3 - Cost and performance.

The cons:
#1 - I guess they are not made in the USA?
#2 - The large diameter chamber needs a larger bore size head gasket?
#3 - Possable quality issue on some early heads? (just to be fair, my Stealth heads castings looked better than my Edelbrock Victors, and I did crack the Edelbrock heads, so any company can have problems?)

I also know of at least three people who have been running the Stealth heads for a year or more with no problems


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Sours: https://board.moparts.org/ubbthreads/ubbthreads.php/topics/712589/440-source-stealth-heads-good-bad.html

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Source heads 440

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440 Source 543 inch stroker kit part 1. What do you get?

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Now discussing:

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