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Re: 440 Source Stealth and Stealth CNC...How fast?
[Re: JohnRR]
#1730901
01/16/15 07:10 PM
01/16/15 07:10 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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... because the valve stem diameters are different. (C'mon, John, remember to complete your thoughts!  )
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Re: 440 Source Stealth and Stealth CNC...How fast?
[Re: RapidRobert]
#1730902
01/16/15 07:14 PM
01/16/15 07:14 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
General Question: starting from scratch would it be better to purchase the super stealths as opposed to the regular stealths? (super street app). I know they do require the offset intake rockers which be addit'l $$$
You might want to get board member "LaRoy Engines" opinion on this. I believe some time in the past, on another web forum far far away, he posted some porting results on both the regular and "Super" Stealth heads and said the "Super" version wasn't really much better.
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Re: 440 Source Stealth and Stealth CNC...How fast?
[Re: BradH]
#1730905
01/16/15 07:21 PM
01/16/15 07:21 PM
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Joined: Dec 2013
Posts: 403
Romulus, MI
GTS340
mopar
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mopar
Joined: Dec 2013
Posts: 403
Romulus, MI
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Quote:
... because the valve stem diameters are different.
(C'mon, John, remember to complete your thoughts! )
Maybe the technology behind valve guide reamers never found it's way to U.S.S.A.??
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Re: 440 Source Stealth and Stealth CNC...How fast?
[Re: Tommy D]
#1730906
01/16/15 07:55 PM
01/16/15 07:55 PM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
The 452's have never been flowed. They have 2.14/1.81 valves, and were professionally done by a guy named "Spider" that has since passed away. My local machine shop did some work on them and commented on how goood they looked, but they're 452's. Looking at Dwayne Porter's tests tell me that the best of the best 452's don't flow what an out of the box Stealth will flow. I would still be using these heads on this motor if it were not for the worn out header bolt holes that leak pretty badly. I realized that some of the leaking is coming from a freeze plug that's rotted. Hopefully that is the only issue and I can use them on my son's '64 convertible.
As for the other brands of heads, they were not an option as i wanted the stock appearance that only the Stealth has. I'm not trying to fool anyone, but let's face it, I don't have a bar. 11.50's is all I'm allowed to run anyway. Was hoping to get it sorted and put a 10.99 slip in the glovebox and go get some ice cream...ok beer!
Being a rag top and no bar you cant even run 11.50..
I think your good to 12.0.. but I'm not positive
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Re: 440 Source Stealth and Stealth CNC...How fast?
[Re: BradH]
#1730907
01/16/15 08:53 PM
01/16/15 08:53 PM
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Joined: Jan 2003
Posts: 75,020
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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Quote:
... because the valve stem diameters are different.
(C'mon, John, remember to complete your thoughts! )
I thought they were longer also ???
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Re: 440 Source Stealth and Stealth CNC...How fast?
[Re: Tommy D]
#1730908
01/16/15 09:02 PM
01/16/15 09:02 PM
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Joined: Jan 2003
Posts: 75,020
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,020
U.S.S.A.
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Quote:
The 452's have never been flowed. They have 2.14/1.81 valves, and were professionally done by a guy named "Spider" that has since passed away. My local machine shop did some work on them and commented on how goood they looked, but they're 452's. Looking at Dwayne Porter's tests tell me that the best of the best 452's don't flow what an out of the box Stealth will flow. I would still be using these heads on this motor if it were not for the worn out header bolt holes that leak pretty badly. I realized that some of the leaking is coming from a freeze plug that's rotted. Hopefully that is the only issue and I can use them on my son's '64 convertible.
As for the other brands of heads, they were not an option as i wanted the stock appearance that only the Stealth has. I'm not trying to fool anyone, but let's face it, I don't have a bar. 11.50's is all I'm allowed to run anyway. Was hoping to get it sorted and put a 10.99 slip in the glovebox and go get some ice cream...ok beer!
I had a set of Paul Rossi street fighter heads that Dwayne massaged further and everything I have read on out of the box stealths that have been flowed on a bench I trust tell me those 452's flow just as good as an out of the box stealth. If you think that out of the box stealths flow the CLAIMED numbers you would be wrong in that assumption.
As far as not trying to fool anyone??? You're fooling yourself too if you think that way, the reason you want them is because they look stock, it's all about fooling people ... and it appears yourself included.
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Re: 440 Source Stealth and Stealth CNC...How fast?
[Re: BradH]
#1730910
01/16/15 10:02 PM
01/16/15 10:02 PM
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Joined: Oct 2011
Posts: 559
Idaho
LaRoy Engines
mopar
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mopar
Joined: Oct 2011
Posts: 559
Idaho
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Quote:
Quote:
General Question: starting from scratch would it be better to purchase the super stealths as opposed to the regular stealths? (super street app). I know they do require the offset intake rockers which be addit'l $$$
You might want to get board member "LaRoy Engines" opinion on this. I believe some time in the past, on another web forum far far away, he posted some porting results on both the regular and "Super" Stealth heads and said the "Super" version wasn't really much better.
I'll try to combine everything quickly. The Super Stealth is the easiest short valve head I have found to port to 320cfm. You can do it quickly with a 2.14 intake, but the port opening is so rough it's best to take it right out to max wedge size. That's what it was designed for anyway.
With bigger valves I have found that both the Stealth and Super Stealth max out, for me, around the same 345-350cfm. The Stealth does it with a narrower port window and doesn't require the off-set rockers.
A properly ported 452 iron head will crush the OOTB Stealth. When both are ported the Stealth is superior to the iron 452 in the upper lift ranges. I have a hard time getting the 452 beyond 305cfm. My son says if I lay the dumb-ass aside they would probably go more. I let him speak, he is after all a better porter than I.
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Re: 440 Source Stealth and Stealth CNC...How fast?
[Re: BradH]
#1730912
01/16/15 10:42 PM
01/16/15 10:42 PM
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Joined: Mar 2009
Posts: 2,464
Sydney,Australia
tex013
top fuel
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top fuel
Joined: Mar 2009
Posts: 2,464
Sydney,Australia
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Bradh, The 10.99 was a one off car normally ran 11.05 - 11.12 ish.had never even looked like a 10 , nearly crashed at timecards when i saw it  Dont forget those heads were probly maxed with the cam lift i have , i know if i put a bigger lift cam it will pick up more . But i exceed class / track regs for et now. I dont want to cage it . It will regularly push into the 10's with the new heads . Cam is only 540 gross lift , 0.020 lash I feel it was closer to 1 1/2 tenths consistant gain , not looking at 1 offs It did pick up around 35 rwhp on the dyno And no this is not an all out motor , just a street strip daily driver . All out these would not necessarrily be my choice , but bang foe buck 2 years ago they are great . Maybe the new sidewinder / trickflow may be better . I am more than pleased with the result , by the way the cnc's cost me $2000 aussie delivered Tex
Last edited by tex013; 01/16/15 10:52 PM.
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Re: 440 Source Stealth and Stealth CNC...How fast?
[Re: Tommy D]
#1730919
01/18/15 05:59 PM
01/18/15 05:59 PM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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Quote:
Thanks Ron. I know where you stand! '63's all the way. Hope you and Gary are well. Send him my best and a congrats on hitting the 9's. TD
I will let him know and thank you. Ron
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But you know my favorite is pops 63. 
Ron
