440 Source Head Opinions?

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ultimatejay said:
I ran 7 years on the same engine with not one blow up or leak but my engine was naturally aspirated. Naturally aspirated rotaries are actually very reliable and if they ever do blow up they never leak oil. The 787b won 24hr la mans because it was the most reliable engine, not because it was the fastest. Now on the other hand when you add a bunch of boost, these engines were not made to hold 60+lbs of boost like some of these guys are running crazy boost and crazy times 6.00 in the 1/4 mile! What happens is the housing twist and crack and the oil feed is exposed and sprays oil. Now with billet technology today they are making all these parts out of billet and the breakage is much less with the turbo cars. But just like top fuel, if you are running on the very limits, stuff is going to break. Thats why I went all motor because no way I had the time or money to build engines all the time.
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Let's see one of them survive Drag Week.
 
Swingn’71 said:
AND you are a VERY regular customer you MIGHT get that local machine shop to agree to do those iron heads for you. If you have a YEAR or so to wait…Swingn’
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And if you're lucky, they've seen a set of 906 or 452s before.
 
ultimatejay said:
Just google "Problems with Stealth heads" and go through the endless amount of problems with cracking and retainers, etc. You get what you pay for as the saying goes. China metal is junk guys common. Use your heads. How do you think they can make them so cheap? Yeah because they use cheap parts, cheap labor and cheap crap metal! I'm done here
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No, you're not.
 
I'll say again that I like my Stealth heads. And I drive my car. Hard. I had them cnc ported, valve job,, springs, keepers, locks replaced to keep up with my Hughes STL3842 solid lifter cam. I've walked away from several newer Camaro ss and Mustang GTs. They are a solid option to consider along with TF and Edelbrock.
 
Long time lurker here, I'm mostly on Moparts, FBBO, etc.

Reviewed all 9 pages of detail and found something funny, that no one called out, that makes me giggle.

Summation of one portion of this conversation: Merica, buy Merican, China is the devil, Mericans should be ashamed of themselves for buying Chinese parts; hey, check out this cool Japanese, rotary car that I used to own. :rofl:
 
parksr5 said:
Long time lurker here, I'm mostly on Moparts, FBBO, etc.

Reviewed all 9 pages of detail and found something funny, that no one called out, that makes me giggle.

Summation of one portion of this conversation: Merica, buy Merican, China is the devil, Mericans should be ashamed of themselves for buying Chinese parts; hey, check out this cool Japanese, rotary car that I used to own. :rofl:
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Oh, not to mention they're our ideas the Chinese are copying. I don't care how fast a rotary can go...they're still not cool to me & 99.9% of the dudes here.
Chicomm government evil, Chinese people not evil
 
parksr5 said:
Long time lurker here, I'm mostly on Moparts, FBBO, etc.

Reviewed all 9 pages of detail and found something funny, that no one called out, that makes me giggle.

Summation of one portion of this conversation: Merica, buy Merican, China is the devil, Mericans should be ashamed of themselves for buying Chinese parts; hey, check out this cool Japanese, rotary car that I used to own. :rofl:
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nice first post interesting choice of words obviously meant to agitate [giggle,summation,Merica] if you can quit giggling long enough please post details of your mopar
 
I have no issue with anyone liking Japanese cars, or any car for that matter. Do what you do, who cares what others think, do what makes you happy. Same thing with parts purchases. I try to buy American when I can but, have bought non-American parts too. I bet at some point, I will own some Stealth heads. I was the guy who sunk money into iron heads though too, have a set of cnc ported 906's. Again, buy what you want and who cares what others say.

I just found it comical that there was a strong opinion voiced to support American products, etc. and come to find out, the guy was rocking a non-American car. Again, no hate on what car one chooses to build, etc. The rotary engines are rather impressive to me, some make a lot of power. Not my thing but, to each their own. I can still look at a car and appreciate craftsmanship, etc., even if it's not my thing.

My Mopar is a 69 Road Runner. Bench seat, column shift car; nothing special. Have all the numbers matching parts but, have been running a 470 for the past 10 or so years. Just a nice driver car.

Have a few Mustangs and some square body Chevy's too. I like a lot of different cars.
 
Lowcar said:
nice first post interesting choice of words obviously meant to agitate [giggle,summation,Merica] if you can quit giggling long enough please post details of your mopar
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Since we're mincing words, can you explain why you think "summation" has a negative connotation?
 
Chiva Falls is in the range adjacent to the one Mt.Lemmon is in, lots of granite out there.
 
I'm sure it's been posted in one of the 200+ replies above, but I didn't see it with a quick scan. Engine masters did a BBM cylinder head shootout.
The 440 Source heads made ~15 hp more than stock 516's, or maybe 906 head?
The Edelbrock made ~15hp more than the 440 source
and the Trick flows made ~15hp more than the Edelbrocks.
 
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72Duster440 said:
I'm sure it's been posted in one of the 200+ replies above, but I didn't see it with a quick scan. Engine masters did a BBM cylinder head shootout.
The 440 Source heads made ~15 hp more than stock 516's,
The Edelbrock made ~15hp more than the 440 source
and the Trick flows made ~15hp more than the Edelbrocks.
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I saw that episode, very informative and basically confirms what most of us already know. Stealths are an affordable aluminum copy of iron heads with some slight improvements, nothing more nothing less.
 
MopaR&D said:
I saw that episode, very informative and basically confirms what most of us already know. Stealths are an affordable aluminum copy of iron heads with some slight improvements, nothing more nothing less.
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You've got to be kidding.
A stock 516 isn't in the same universe as a Stealth head.
 
72Duster440 said:
I'm sure it's been posted in one of the 200+ replies above, but I didn't see it with a quick scan. Engine masters did a BBM cylinder head shootout.
The 440 Source heads made ~15 hp more than stock 516's, or maybe 906 head?
The Edelbrock made ~15hp more than the 440 source
and the Trick flows made ~15hp more than the Edelbrocks.
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MopaR&D said:
I saw that episode, very informative and basically confirms what most of us already know. Stealths are an affordable aluminum copy of iron heads with some slight improvements, nothing more nothing less.
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fishmens67 said:
You've got to be kidding.
A stock 516 isn't in the same universe as a Stealth head.
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LocuMob said:
It was a 906 head.
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And every test is different depending upon the build of the engine. I think Dwayne already mentioned the same earlier.

I did a test on a 7.9:1 compression 440 where I swapped stock 906 heads for a set of ported 516 heads that flowed 250 cfm @ .500" lift. The engine went from 450 LB-FT and 387 HP to 473 LB-FT and 449 HP.

A test by someone else has nothing to do with the results you may see. Engine builders with exactly the same parts will get different results from each other.

In our shop if we only saw a 15 HP increase from a stock 906 head to Stealth heads we had a major screw up with the engine some where.
 
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72Duster440 said:
I'm sure it's been posted in one of the 200+ replies above, but I didn't see it with a quick scan. Engine masters did a BBM cylinder head shootout.
The 440 Source heads made ~15 hp more than stock 516's, or maybe 906 head?
The Edelbrock made ~15hp more than the 440 source
and the Trick flows made ~15hp more than the Edelbrocks.
Click to expand...
I'm skeptical of the validity of this information as well. If the Source heads only produced 15 more..the eddys 15 more again and then a cnc ported trick flow only 45 more than stock must be the crappiest cnc job in history thats pretty expensive hp in my opinion. Not exactly a good sales pitch for Trick flow either.
 
Here's the numbers they came up with. 906 was run on a previous day.

PXL_20220614_184808920.jpg
 
Hallzy said:
I'm skeptical of the validity of this information as well. If the Source heads only produced 15 more..the eddys 15 more again and then a cnc ported trick flow only 45 more than stock must be the crappiest cnc job in history thats pretty expensive hp in my opinion. Not exactly a good sales pitch for Trick flow either.
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It was a pretty mild cam and short block they tested on iirc, I mean 450-500 HP is not much from a 440 these days. I think they mentioned this in the episode, if they were using a bigger cam and more compression there would have been more gains with the "bigger" heads.

I think it's a useful takeaway that better-flowing heads alone won't do a whole lot for power if the rest of the combo doesn't take full advantage of the flow.
 
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