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Re: Stealth Head question
[Re: ZIPPY]
#1172998
02/07/12 11:04 AM
02/07/12 11:04 AM
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Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
jyrki
master
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master
Joined: Jan 2003
Posts: 2,932
Finalnd, Perkele
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Don't know. The guy exploded 3 Stelth heads, switched to Indy EZ's and has been fine after that. Perhaps some detonation, it was/is a 14-71 blown wedge. Anyway, seems that the Stealths are not the strongest castings around. We have one set of Stealths on a Koln blown 400, and that has worked without any problems, and one with RPM's and a 8-71 (that will be switched to turbos this winter and put into a '70 Chrysler New yorker, aiming at 300 km/h top speed) and that has been fine too.
Plynouth VIP '67 TT IC EFI
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Re: Stealth Head question
[Re: hemigod426]
#1172999
02/07/12 02:34 PM
02/07/12 02:34 PM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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does this not prove its a great stock looking replacement head?
Have you ever been in a pissing contest with a skunk?? LOL. 
I'm going to have to say you both have been .
Von , you'll never change the mind of a source sword swallower
Hey John Why is it any 440 Source thread appears you appear. You must be the THINK you are a expert on thier product. I have been pounding the first run Stealth Heads from day one. I milled the chambers down to 72 cc.Roller cam with seat pressure of 245 and open at 580 to 600 pounds. I am run E85 . I SHIFT AT 6800 RPM. NOW THIS HAS BEEN DONE WITH NO PROBLEMS AT ALL.This kinda makes me more reliable person to ask what the stealth heads are capable of. Are there better heads? HELL YES!!! Do they cost more? YES! ARE STEALTH HEADS A ALL OUT RACE HEAD? NO NO!!! These heads fit the area between the old 906s and 915s and the Indy and edelbrock heads. Not for everyone but a heck of alot better than spending hundreds of dollars on old cast iron junk. 
thank you slippery 440, and little john any time you wanna go fast and look stock ill let you swallow my source sword,but pay attention to the ball bearings they can get fast and loose...
Would that include cutting .080 off the deck , .050 off the heads and not being concerned with intake fit ?
I'll pass needle d... , that's not my style.
stalker440, why do you or any of the other pipers mice care where I post? Did I say one derogatory thing about any source product in this thread? It's good to hear those heads are working out for you.
Now if I posted posted up the picture of that head I would have been give a long vacation ...
right click .... save
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Re: Stealth Head question
[Re: hemigod426]
#1173000
02/07/12 02:38 PM
02/07/12 02:38 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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flow 285 otb,
FWIW, in the stealth vs eddy rpm flow test that that dwayne (fast68plymouth) did when the stealths first came out, neither the stealth nor eddy heads came near touching 285cfm OOTB. In that test, at .300 lift and below, the stealths had a slight few cfm edge over the eddy heads, after that the eddys had about a 10cfm lead, peaking at 276cfm at .600 lift. From what I'm told, a clean up of the bowl to valve seat transition on the steath heads really helps bring them up to par with the eddy heads.
But hey, everyone's flow bench is different. Some seem to put out some really 'happy' numbers! 
you can also pick up those #s by doing nice unshrouding of valves with no other work and remill to get the same size chamber.but scrap 452 iron heads must be better...with ports bone stock, little bowl cutting/blending and 5 angle valve job #s get better with stealth heads.and full ported will flow 300-320 intake at useable lift of 600,does this not prove its a great stock looking replacement head?
The stealths are a good head, I own a set of the first run stealths. And yes of course their flow comes up nicely with porting. The CNC job that Jeff at modern cylinder head does will bring them up to a nice 300cfm flow. But that's an extra 1k. My point is the stealths absolutely do not flow 285cfm right out of the box. The edelbrocks don't even flow 285cfm OOTB. The flow test that Dwayne did when they first came out several years ago:
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4.375 bore, 28" test pressure, radius plate on intake, no tube on exhaust:
average flow for #5 and #7 cylinder
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
here is an OOTB E head i tested recently, also the average for a left and right cylinder:
lift----I/E
.100--66.1/50.8
.200-138.3/105.4
.300-203.8/140.5
.400-243.1/163.6
.450-258.0/170.4
.500-265.7/178.6
.550-272.3/185.3
.600-276.5/190.3
.650-276.1/194.6
.700-275.7/197.3
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Re: Stealth Head question
[Re: 2734bbl]
#1173002
02/07/12 06:00 PM
02/07/12 06:00 PM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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Quote:
Which piston design is better for the stealth head? Flat top(zero deck), dome or reverse dome? for and 10-11 to 1 NA application?
What size is the engine ?
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Re: Stealth Head question
[Re: JohnRR]
#1173003
02/07/12 07:19 PM
02/07/12 07:19 PM
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Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
2734bbl
member
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member
Joined: Feb 2010
Posts: 155
Tulsa oklahoma USA
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Which piston design is better for the stealth head? Flat top(zero deck), dome or reverse dome? for and 10-11 to 1 NA application?
What size is the engine ?
440 stock stroke. I have KB flat tops at zero deck with 452s now. Lookin to go 915s or Stealths.
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Re: Stealth Head question
[Re: 2734bbl]
#1173004
02/07/12 09:27 PM
02/07/12 09:27 PM
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Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
Chris2581
master
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master
Joined: Jan 2003
Posts: 6,531
Jacksonville, FL
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I bought a set of Stealth's 2 years ago.Main reason..price,as I was building a more street orientated and true pump gasoline 440.Engine has cast pistons,9.0 compression and a MP 557 cam.I have not tuned the engine 100% yet as I only made a total of 4 passes at 2 different tracks,but I'm running 11.30,and I think I still have a tenth in the combo.It would have cost just as much to go back thru my pocket ported 452's that were damaged after I lost a 440 back in 2004,as it did to get the new Stealth's.
The Stealth heads have done the job for me,and I'm pleased with how they have performed.
Nautilus Racing-
We use Superformance gaskets and Turbo Action converters/products.
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Re: Stealth Head question
[Re: 2734bbl]
#1173008
02/08/12 12:34 AM
02/08/12 12:34 AM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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Which piston design is better for the stealth head? Flat top(zero deck), dome or reverse dome? for and 10-11 to 1 NA application?
What size is the engine ?
440 stock stroke. I have KB flat tops at zero deck with 452s now. Lookin to go 915s or Stealths.
I don't have the numbers but the KB has a pretty big canyon for a valve relief , use a .040ish head gasket and the closed chamber head will be fine. Go for the alum unless you find a smoking deal on the 915's. Just don't plan on running the stealths out of the box .
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Re: Stealth Head question
[Re: buck440]
#1173009
02/08/12 02:44 AM
02/08/12 02:44 AM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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what about dome pistons say trw 2295's
You don't want anything that protrudes above deck when you run a closed chambered head like the stealths.
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Re: Stealth Head question
[Re: hemigod426]
#1173013
02/08/12 07:41 PM
02/08/12 07:41 PM
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Joined: May 2004
Posts: 3,210
robin hood country
deaks
master
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master
Joined: May 2004
Posts: 3,210
robin hood country
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were do you come up with this crap?by coping old wrong info you did not find by doing. holmes the dome part goes under the open part of the chamber,of a closed chamber head. you will have more problems with eddy heads and dome pistons because of angle plugs. you have to grind/open up the plug relief in dome. here a pic of 440 i did 3 years ago with ross tall dome pistons and stealth heads, fit perfect. and Dear johnRR my 4340 billet hemi crank and big shinny stage v alum head is so massive your gunna need two hands to lift it,if you say i swallow anything honey 
I run 76 cc edelbrock heads with JE domes 12.7.1, i use autolite AR3931 none projected tip plugs and they clear fine.
Mick
69 Dart GTS 440 mopar .590 cam, Edelbrock heads, 3200#
best et 6.45, 106.78, 10.14, 132.88 mph, 1.47 60ft
best 60ft 1.36
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Re: Stealth Head question
[Re: hemigod426]
#1173014
02/08/12 08:11 PM
02/08/12 08:11 PM
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Joined: Jan 2003
Posts: 75,005
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,005
U.S.S.A.
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Quote:
Dear johnRR my 4340 billet hemi crank and big shinny stage v alum head is so massive your gunna need two hands to lift it,if you say i swallow anything honey
I won't say it but if you are admitting you'll swallow anything
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