Hi all thinking of buying a set of the 440 stealth heads they say that they flow 280/290 cfm out the box has any body brought a set any info will be appreciated tring to keep the original look i allso have a set of the stage v heads that i am going to use if the stealth heads dont work out thank every one

Everything you want to know, the good, the bad, the ugly. Just follow the link.

https://board.moparts.org/ubbthreads/show...part=1&vc=1

This should be good

WOW i must have open a can of worms with Qu about theist heads

From what I saw when viewing them in person it would be a good idea to replace the valve spring retainers and keepers when you install the correct springs for your cam. Other than that, I think there was some question on which head gasket should be used but it seems that the consensus was that any gasket that doesn't hang into the bore would be kosher.

Hope this helps...

I think mid-250's has been found fairly often but I don't have threads marked to back that up. Mine, 254 @ .600, OOTB on a superflow600, 28" water.

lift----I/E
.100--63.8/49.0
.200-140.5/104.1
.300-207.8/139.7
.400-239.2/164.6
.450-248.1/172.5
.500-256.1/177.8
.550-261.5/182.6
.600-265.3/188.2
.650-267.3/191.5
.700-267.3/195.8

That's out of the box source heads on Porter racings flowbench.

They flowed about the same on another superflow 600 bench

Flow #'s from my bench, 4.350 bore at 28":
Here are the flow #'s:

Before: Int. Ex.
.200 143 103
.300 209 135
.400 245 163
.500 261 180
.600 266 190
https://board.moparts.org/ubbthreads/show...rue#Post4859386
After: Int. Ex.
.200 151 112
.300 220 154
.400 270 182
.500 284 205
.600 291 215

I bought a set a few months back. I haven't flowed them, but the castings looked really nice.
The valve springs checked out good (I don't have the seat and open pressures handy, but i rember they should work with most mild/mid duration hydraulic cams.) The locks and retainers looked a bit cheap, but I did not notice any issues like I had seen in one of the earlier posts.
The chamber bore is fairly large, but the cheap Fel-Pro gaskets that come in the $50 rebuild kit fit fine although I think they are about 0.052" thick?

I will probbably milidly port the heads and have a performance valve job done before using the heads. I will probbably be using a fairly large cam, so I plan to replace the valve springs, retainers and locks.

Anyhow, I think they are really nice for the $$$, and when painted should look fairly stock.
Also, the straight spark plug holes won't interfere with stock manifolds or stock type headers which is a problem with the edelbrock heads.

I just did the final assembly on mine. They will go on my 440 'stealth' motor that will go into my sig car around March. What I did was smooth and clean up the int & ex ports and the bowl areas. I also installed new retainers and 10' keepers along with some Mopar inner springs as I'm going to go with a hyd roller cam. All of the chambers came out to about 84cc's . My heads were from the first production run and overall I was pleased with the quality.