Stealth heads from 440Source

[Pistol Gripper]

Just took a look at their website:
http://www.440source.com/heads.htm

Sounds almost too good for the money.  Anyone have any inside info on these heads ?

P.G.

[Chryco Psycho]

they Look good , the 2 things I do not like about them is the lack of Heart shape / high efficiency swirl chamber & the size of the chamber with alum absorbing approx 1 point of compression through heat loss it would make more sense to have it compensate by reducing the chamber size to 78cc so that it would bolt on to existing engines combos , I am sure the reason they did this though is to allow for easier builds on stroker specific engines mot existing 440 combos

[Pistol Gripper]

For compression, they do have thick decks:

"Super thick deck surface ensures these heads have tons of meat in the deck to withstand high compression, nitrous, or to allow for plenty of milling. Use this feature to reduce the chamber size.. (great for getting high compression ratios AND great flame travel with a flat-top piston.)"

You agree with this ?

P.G.

[tactransman]

That is a good price.It looks like they have them set up to mill 'em to get the chamber size you need.

[bb71challenger]

Wow, those really look good!!!! For that kind of money it would not be a problem to get the heads milled a bit to tighten up the chamber and raise compression if in fact there really is plenty of meat to do it. I am glad companies are now stepping up to the plate and catering to us for a change, it has been a LONG time coming

[Chryco Psycho]

milling works to a point , you have to mill both the deck & intake face to get the intake on & if the angle is not right on it can be tough to get the intake to seal

[LAA66]

milling works to a point , you have to mill both the deck & intake face to get the intake on & if the angle is not right on it can be tough to get the intake to seal

 At the risk of threadjacking, how does one go about replacing an existing intake that had been cut down from several (minor) head and block deck resurfacing events. In other words, the new intake will not be the same as the original as it relates to the sealing surfaces.

[tactransman]

Just about all new intakes do not fit as good as they could and usually need milling for the ports (roof,floor and angle) to line up perfectly. Dave Hughes at Hughes Engines proved this to me.

[Chryco Psycho]

This is exactly why the intake surface on the head needs to be cut when the block or head decks are cut , it is very difficult to determine afterwards how much material needs to be milled from an intake if you decide to use a different intake later on

[Pistol Gripper]

I would think that you would want to take material off the heads only, not off the intake manifold itself.  Off the deck and intake face as CP said.  That way the manifold can be put on a different engine w/o worry.  The heads can be too as long as they stay as a pair, clearance & compression permitting.

P.G.

[bb71challenger]

I would think that you would want to take material off the heads only, not off the intake manifold itself.  Off the deck and intake face as CP said.  That way the manifold can be put on a different engine w/o worry.  The heads can be too as long as they stay as a pair, clearance & compression permitting.

P.G.

That is what I had done to a set of 906 heads. .050 off the deck surface and like .062 or something similar off the intake port side of the heads. The heads actually required MORE to be milled off the sides than the deck surface. It fit ok even with double intake gaskets with the valley pan.

[LAA66]

This is exactly why the intake surface on the head needs to be cut when the block or head decks are cut , it is very difficult to determine afterwards how much material needs to be milled from an intake if you decide to use a different intake later on

 Probably would have been the way to go.

 In my particular situation though what's done is done. Maybe a good machine shop could transfer the old intake dimensions to the new one. Also, is there a trick to match porting the intake runners to the heads?

[Jacksboys]

Just wondering how they can sell their heads for $900, but you cannot find the edelbrock heads for less than $1200 

[moparniac]

Ony my edelbrock heads untouched!!! I had to take off .045 on the intake flanges of my edelbrock intake to get a perfect fit.... yes there is a formula...

those are just edelbrock heads but a great price........

[Chryco Psycho]

 Probably would have been the way to go.

 In my particular situation though what's done is done. Maybe a good machine shop could transfer the old intake dimensions to the new one. Also, is there a trick to match porting the intake runners to the heads?

 I just use an old intake pan & match the bolt holes up as close as possible & then match the port window to the intake gasket , it will get you a Lot closer than as cast