Problems with Stealth 440 source heads.
#296040
04/22/09 08:50 AM
04/22/09 08:50 AM
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Joined: Jan 2003
Posts: 353
Chesterfield, MIch
Cuda67
OP
super street
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OP
super street
Joined: Jan 2003
Posts: 353
Chesterfield, MIch
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Heard that they have alot of problems. (Can't find head gaskets that fit, need to shim rocker shafts, and poor casting. Made in china.) Sounds like buy cheap get cheap? Which is better open chamber or closed? Which cast iron head is better to over? Should I forget cast and go to Aluminum? 67 383 with 484/284 and 10.5 trw pistons. I'm new to this.
Thanks for any help.
10.0-1
Last edited by Cuda67; 04/22/09 09:06 AM.
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Re: Problems with Stealth 440 source heads.
[Re: Cuda67]
#296042
04/22/09 09:06 AM
04/22/09 09:06 AM
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Joined: Oct 2005
Posts: 8,869
Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,869
Ontario, Canada
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Quote:
Can't find head gaskets that fit
Stock one's don't fit but daskets that do fit are readily available
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need to shim rocker shafts
Mill any head or deck the block and you're likely to have to shim the shafts for proper geometry
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poor casting
The first batch had some issues but those were supposedly resolved and the customers taken care of
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Made in china
Yeah, so ?!?!?!?
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Re: Problems with Stealth 440 source heads.
[Re: Cuda67]
#296044
04/22/09 09:11 AM
04/22/09 09:11 AM
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Joined: Jan 2007
Posts: 160
Florida
hemisurfer
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member
Joined: Jan 2007
Posts: 160
Florida
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My Stealth heads are awesome, needed no more work than a set of Eddy's would. Solid lifter Comp Cam and despite what you read I was able to use the 440 Source springs, just had an inner damper added for 50 bucks .
Had them ported by Modern Cylinder and they now outflow many race heads, and they look stock something no other aluminum head can claim.
Do some homework they are great heads.
Chris
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Re: Problems with Stealth 440 source heads.
[Re: Stanton]
#296045
04/22/09 09:20 AM
04/22/09 09:20 AM
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Joined: Jan 2003
Posts: 74,979
U.S.S.A.
JohnRR
I Win
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I Win
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Quote:
Quote:
need to shim rocker shafts
Mill any head or deck the block and you're likely to have to shim the shafts for proper geometry
WRONG , machining the decks of either the head OR the block ABSOLUTELY DOES NOT EFFECT ROCKER GEOMETRY .
Using rocker shaft shims to make up for aggressive head/block machining will SCREW UP your rocker to valve tip geometry. The PROPER fix is SHORTER push rods ....
this is assuming the rocker to valve tip geometry was correct to begin with 
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Re: Problems with Stealth 440 source heads.
[Re: JohnRR]
#296046
04/22/09 09:38 AM
04/22/09 09:38 AM
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Joined: Jan 2003
Posts: 5,948
British Columbia
chrisf
master
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master
Joined: Jan 2003
Posts: 5,948
British Columbia
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Quote:
What exact piston do you have as there is no such thing as a 10.5 trw piston for a 383 .
also you want closed chamber heads .
all the negatives about the stealths are just unfounded internet rumors .
just checked, its not april fools, is this the new mellower JohnRR we have hear rumors about or just sarcasm? 
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Re: Problems with Stealth 440 source heads.
[Re: Cuda67]
#296049
04/22/09 11:24 AM
04/22/09 11:24 AM
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Joined: Jan 2003
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U.S.S.A.
JohnRR
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I Win
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Quote:
10-1
Still ??? do you have the number of the exact piston ? I think we have been thru this , if not it's VERY HARD to get 10.0 compression with a FLAT TOP PISTON in a stock stroke 383.
Is your piston a flat top or a DOME ??? What head are you currently using ?
The chamber on the stealth is 84 cc , you are going to have to cut the heads below 80 cc to even think about getting 10.0 in a 383 if you have flat top pistons .
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Re: Problems with Stealth 440 source heads.
[Re: JohnRR]
#296050
04/22/09 12:15 PM
04/22/09 12:15 PM
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Joined: Jan 2007
Posts: 160
Florida
hemisurfer
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member
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Florida
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correct I was running a 383 that if I remember right was .010 or .020 in the hole and with a 79.5cc chamber (NHRA stocker spec) it was a little over 10.1 with stock pistons/rods. Head gasket was .035 or .030 compressed.
Chris
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Re: Problems with Stealth 440 source heads.
[Re: hemisurfer]
#296051
04/22/09 12:44 PM
04/22/09 12:44 PM
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Joined: Jan 2003
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U.S.S.A.
JohnRR
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I Win
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Quote:
correct I was running a 383 that if I remember right was .010 or .020 in the hole and with a 79.5cc chamber (NHRA stocker spec) it was a little over 10.1 with stock pistons/rods. Head gasket was .035 or .030 compressed.
Was that a TYPO , to get close to 10.0 the piston needs to be NHRA spec .021 (.020???) ABOVE THE DECK .
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Re: Problems with Stealth 440 source heads.
[Re: JohnRR]
#296052
04/22/09 01:18 PM
04/22/09 01:18 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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Quote:
all the negatives about the stealths are just unfounded internet rumors .
Wow John, thank you. That just made my whole day!   
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Re: Problems with Stealth 440 source heads.
[Re: JohnRR]
#296053
04/22/09 02:27 PM
04/22/09 02:27 PM
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Joined: Dec 2007
Posts: 7,759
So Cal
HealthServices
Why would you even post that?
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Why would you even post that?
Joined: Dec 2007
Posts: 7,759
So Cal
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Quote:
all the negatives about the stealths are just unfounded internet rumors .
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Re: Problems with Stealth 440 source heads.
[Re: Cuda67]
#296055
04/22/09 03:33 PM
04/22/09 03:33 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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Posts: 36,040
Lincoln Nebraska
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If it's running now I'd do a compression check that'd give you something for a baseline, if not measure your deck height when you open it up so with the new heads you can plug it all into http://kb-silvolite.com/calc.php? to get your actual CR
live every 24 hour block of time like it's your last day on earth
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Re: Problems with Stealth 440 source heads.
[Re: JohnRR]
#296056
04/22/09 05:11 PM
04/22/09 05:11 PM
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Joined: Jan 2007
Posts: 160
Florida
hemisurfer
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member
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Posts: 160
Florida
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not a typo it was a true 10-1 down in the hole .010,.020 with 79.5cc chambers NOT ABOVE THE DECK.From the factory chambers were 88cc, closer to 8.2-1 even though advertised at 10.5-1. This was a 70 date coded HP 383 Motor.
Chris
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Re: Problems with Stealth 440 source heads.
[Re: hemisurfer]
#296057
04/22/09 11:15 PM
04/22/09 11:15 PM
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Joined: Jan 2003
Posts: 74,979
U.S.S.A.
JohnRR
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I Win
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Quote:
not a typo it was a true 10-1 down in the hole .010,.020 with 79.5cc chambers NOT ABOVE THE DECK.From the factory chambers were 88cc, closer to 8.2-1 even though advertised at 10.5-1. This was a 70 date coded HP 383 Motor.
Something does not add up , to get 10.0 with 79.5 cc chamber the piston HAS to be poking above the deck .020ish, below the deck that much the chamber needs to be near 73cc .
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. They are a good buy & you'd take them to your machinist to be checked over just like every(mass produced) part should be checked before you use it.
