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440 Source Stealth Heads

My current set up is, 440 .03 over Straightline performance hydraulic flat tappet cam 226/238 duration @.05 503 lift with adjustable hydraulic rockers, Edelbrock Performer RPM intake with a Edelbrock 650 AVS-2 carb. Pertronix 3 distributor. 4 speed with 3:54's. This winter I plan on going with a Scott Brown Hydraulic Roller setup and possibly a new set of heads not sure who's heads right now. Not sure about the Eddie's as the plugs are set at a angle and if I decide to go with headers not all headers will clear the plugs. 440 source heads and Mopar Performance heads have straight in plugs like factory heads, I like the Mopar heads but are about $800 bucks more than the 440 source heads. I do know some guys running the Mopar Heads and they really like the improvement but I do have a budget and the way this country is heading who knows what's going to happen and might need my car fund for other things to survive LOL
why the small 650 cfm carb ?
 
why the small 650 cfm carb ?

You wouldn't believe how much better my current setup runs with this AVS-2. It replaced a 750 edelbrock and a 800 edelbrock and it out performs both of them. Got to remember these 440 came from the factory with 650's but these new AVS-2's are simply awsome.
 
You wouldn't believe how much better my current setup runs with this AVS-2. It replaced a 750 edelbrock and a 800 edelbrock and it out performs both of them. Got to remember these 440 came from the factory with 650's but these new AVS-2's are simply awsome.
i will have to try one, will it still pull in the upper rpms
 
I Disagree with the ‘pointless if you use stock manifolds’ comments. Depending on your build you can still gain quite a bit. Just not as much as a car using a header or more free flowing exhaust.
I also disagree with “pointless”. Just look how fast the Fast Class cars are going. Yes they may be extrude honing the manifolds but they also run higher compression ratios which helps to move the exhaust gasses. I have a set of 440 Source heads and plan on using stock manifolds but I won’t know how it performs until the engine is complete late next year. We are shooting for a compression ratio of just under 11 to 1 with around 600# of torque.
 
I run the older version of stealth heads on the 505" stroker. They have been lightly ported with multi-angle valve job, and new springs/retainers for the hydraulic roller cam, and using headers. With the port cleanup / valve job, they flowed in the 290's CFM.
 
Let's simplify here. Here's the math, using arbitrary numbers. You pay $*** dollars for a set of heads with all the associated work for the intended performance increase. With manifolds, you get 20 extra horsepower. With headers, you get 40 extra horsepower. Choice: pay $*** for some performance increase OR pay $*** + $headers for more performance increase. Do what you like.
 
You wouldn't believe how much better my current setup runs with this AVS-2. It replaced a 750 edelbrock and a 800 edelbrock and it out performs both of them. Got to remember these 440 came from the factory with 650's but these new AVS-2's are simply awsome.
It will NOT outperform the AVS-2 800 , especially with everything your looking to do with this motor And that’s a fact


And 440 HP motors left the factory with 750cfm by the way

Peace
 
Let's simplify here. Here's the math, using arbitrary numbers. You pay $*** dollars for a set of heads with all the associated work for the intended performance increase. With manifolds, you get 20 extra horsepower. With headers, you get 40 extra horsepower. Choice: pay $*** for some performance increase OR pay $*** + $headers for more performance increase. Do what you like.

Your math is incorrect.
 
For a street car is the extra 20HP worth the hassle of headers? Burnt wires, leaks etc. I would say not worth the aggravation. Now a track car is entirely different.
 
not like the old days, there are better headers out there, way better gaskets too. but i would have to have ceramic coated for sure.
 
Source heads would be less money than doing up a set of iron heads. IMO

Where do you get source heads so cheap?

What people tend to forget is that aluminum heads are less weight, flow better than stock right out of the box. How much coin are you going to spend and stick into a pair of old, outdated, iron heads to get the same benefit as aluminum? The fact is, you can't!!!!!
 
What people tend to forget is that aluminum heads are less weight, flow better than stock right out of the box. How much coin are you going to spend and stick into a pair of old, outdated, iron heads to get the same benefit as aluminum? The fact is, you can't!!!!!
And the aluminum dissipate heat better and allow you to run a half point minimum more compression. Things that iron, no matter how much machine work you put into them, just can't do.
 
Your math is incorrect.

For a street car is the extra 20HP worth the hassle of headers? Burnt wires, leaks etc. I would say not worth the aggravation. Now a track car is entirely different.

Okay folks, I think @WileERobby was using arbitrary numbers to illustrate an example, don’t take the numbers literally.
Also, the OP was asking about heads, not headers, so please don’t turn this into a header debate for him. Sounds like he knows his performance mods with his current setup, so I’m sure he has weighed wether or not he wants headers.
@69a100 and @diesel_lv have summed up nicely the very core of the ideas, which I too believe, that make aluminum heads better choice for less money..
 
You could have a race motor and run stock manifold, it doesn't mean that it'll run like crap. It just won't be running with it's full potential! Furberger did that with Dulcich and a Mustang race motor.

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i will have to try one, will it still pull in the upper rpms

OMG yes, this is what I did, I replaced the factory Orange step-up springs with the pink springs and re-jetted the secondary's from .098 to .104 and she pulls like you wouldn't believe. I had a couple of guys in my car club disagree with me until I took them for a little ride, they both are now running the 650 AVS-2 carb, bigger is not always better it's easier to over carb than under carb.
 
For the 650 cfm questions, the smaller venturies will create more velocity which is great at lower rpm which is where most of us drive. Seat of the pants in light to light will be amazing. But they are a restriction at upper rpm. Depending on the carb barrel and ventury design, they can definitely start to inhibit hp around 450+ hp. But, unless you're drag racing, most of us don't live in the upper rpm's. For reference, I use a 750 double pumper on my 4.6 (281 cubic inch) jet boat w a turbo. It is very responsive down low but allows me to make 650+hp. Small runners, small valves, small venturies will give great bottom end due to velocity. So they "feel" like they have more hp.
 
When you compare the original Carter AVS / AFB of old

Then the Edelbrock AVS / AFB of old

The ANNULAR BOOSTERS of the AVS-2 make you feel like they have more HP

Much more responsive, especially off idle , down low acceleration , even with the smaller primaries/venturies

That doesn’t mean it’s making more HP
 
Just wondering who's running the 440 Source stealth heads, any issues with them ? What kind of power gain with the stock exhaust manifolds.
Running the 440source CNC Stealth ones. But not stock manifolds. Long tube headers. With the upgrades on the heads for valves, they’ve been great!

I will say mopar stock manifolds do a very good job on they’re own but I couldn’t see putting on those heads and not using long tubes.
 
It depends on the situation. Don't get me wrong I like headers however you can make power with exhaust manifolds. They do not like a restrictive exhaust I can tell you that. Also, ditching the dp4b for a street single plane really woke things up. I do think that after a certain power level you have to dial in the camshaft specs to the combo (handicap exhaust due to restriction, minimize overlap to negate reversion) and the tuning window might narrow.

After my cam upgrade there will be a set of stealths in my future to replace the big valve 906's. It will be interesting to see how the tune up changes with a closed chamber. I think they are a fantastic head and am thankful someone made an OE appearing casting instead of the want to be billet look every other aftermarket head has.
 
Late to this part but I have ran then out of the box with manifolds, ran fine and had a noticeable power difference. Engine masters just did a comparison. Stealths vs RPM vs TFS.
 
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