440source Stealth head review and flow numbers

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A couple weeks after he tested the Stealth head, he had a stock Ede RPM on his bench.

From his videos:
Cnc ported Stealth:
Lift——-I/E
.100— 69.0/56.3
.200—143.5/114.8
.300—206.6/149.2
.400—235.3/174.7
.500—262.2/189.5
.600—273.0/200.3
.700—284.5/208.3

Ootb Ede RPM head:
Lift——-I/E
.100— 69.7/58.4
.200—134.7/112.7
.300—200.4/147.0
.400—244.7/172.7
.500—263.7/188.2
.600—285.9/198.6
.700—286.0/205.4
 
PRH said:
A couple weeks after he tested the Stealth head, he had a stock Ede RPM on his bench.

From his videos:
Cnc ported Stealth:
Lift——-I/E
.100— 69.0/56.3
.200—143.5/114.8
.300—206.6/149.2
.400—235.3/174.7
.500—262.2/189.5
.600—273.0/200.3
.700—284.5/208.3

Ootb Ede RPM head:
Lift——-I/E
.100— 69.7/58.4
.200—134.7/112.7
.300—200.4/147.0
.400—244.7/172.7
.500—263.7/188.2
.600—285.9/198.6
.700—286.0/205.4
Click to expand...


I was shocked to see the pathetic numbers he got out of those heads. I quickly ported a set that maxed out around 267 if I remember right to over 300cfm with little effort.
 
pittsburghracer said:
I was shocked to see the pathetic numbers he got out of those heads. I quickly ported a set that maxed out around 267 if I remember right to over 300cfm with little effort.
Click to expand...
Forgive my ignorance, but how do they compare to say stock 915’s?
 
pittsburghracer said:
I was shocked to see the pathetic numbers he got out of those heads. I quickly ported a set that maxed out around 267 if I remember right to over 300cfm with little effort.
Click to expand...
I would've thought the CNC ported Stealth's would flow more, the Edelbrocks were out of the box.
 
In 440source’s defense they got screwed over from the vendor in Michigan that had been doing their cnc work. I won’t get into that but the whole story was on Moparts. They now have someone else doing their cnc work we are being told.
 
My numbers for ootb Ede’s are close to what he got.

I’ve had one set of cnc’d stealth’s in my shop, done by mch back when Jeff was still alive.
Those had the chambers ported and his valve job and back cut.
They flowed about [email protected] on my bench with very good low/mid-lift numbers.

The ones in the video have the std stealth valve job and untouched chambers.
 
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fishmens67 said:
Those are OOTB flow #'s for the standard Stealth head.
Click to expand...
The heads in Eric’s video are cnc ported.
The numbers I posted are from his video.

I’d expect to see about a 10-15cfm gain in the upper lifts from those heads with a different seat profile and back cut to the valves.
 
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PRH said:
The heads in Eric’s video are cnc ported.
The numbers I posted are from his video.
Click to expand...
I didn't watch the video, Jim/ IQ52 has done a bunch of Stealth flow testing.
I seem to remember the OOTB flow #'s were close to what you and John was getting OOTB on the standard stealth.
I do know the Super stealth #'s Jim got were weak.
 
The comment about the results from the cnc stealths being very close to the ootb RPM heads was correct.
Both sets of numbers from EW’s bench.

Ootb stealths are 20-25cfm less than the numbers from the cnc’d ones in EW’s video(260-ish).
 
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pittsburghracer said:
In 440source’s defense they got screwed over from the vendor in Michigan that had been doing their cnc work. I won’t get into that but the whole story was on Moparts. They now have someone else doing their cnc work we are being told.
Click to expand...

Whoever is doing the new work isn't effective. Surprised that 440source didn't keep a old vendor head around as a reference piece.
 
I’d love to test one of the new version cnc stealths for myself.
Then update the valve job and see what happens.
But......by the time you’ve paid for all that...... you’re basically into TF240 money........which is just a nicer head all around imo.
 
440 source should update the site as it still has reference to the Michigan shop.
 
I figured I’d throw these in the mix.........

Cnc ported 906 also tested on EW’s bench, so in theory........ apples to apples:

Lift——-I/E
.100— 69.8/56.4
.200—124.4/105.4
.300—184.3/142.2
.400—236.0/168.8
.500—275.6/185.9
.600—274.9/196.7
.700—277.2/204.0
 
pittsburghracer said:
In 440source’s defense they got screwed over from the vendor in Michigan that had been doing their cnc work. I won’t get into that but the whole story was on Moparts. They now have someone else doing their cnc work we are being told.
Click to expand...
Yeah, I pulled all my work from him, 2 years ago. Shop is 10 minutes from my home.
 
I had 4 pairs of killer hemi heads from there. Too bad.
 
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