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Re: stealth heads?
[Re: 451Mopar]
#736137
07/01/10 03:48 PM
07/01/10 03:48 PM
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Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
RobX4406
I Live Here
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I Live Here
Joined: Apr 2005
Posts: 12,271
Overpriced Housing Central
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Quote:
This is sort of what I was getting at.
I think the CNC ported stealth heads are $997 each and flow about 320 cfm.
A pair of Victor M/W heads from Hughes is $1497 and I think they flow about 320 cfm out of the box (according to Edelbrock, 322 @ 0.600"?)
The Stealths do come with valve springs where the Victors don't, but the Stealth springs are not going to work with a cam that would make 700 HP numbers.
I think at the 700 HP level, both heads should be using high quality rocker systems, so the cost of the differnt rocker offsets is a wash, same for intake and exhaust.
I just bought a pair of EDE Vic MW heads w/valves for $1288, less $100 in goodies/rebates, ~$1200 to my door. Getting T&D 1.7's and some good springs, should be in at around $2800 or so ready to bolt on with some clean up porting. If I went smaller on the cam, I could run rockers which cost basically $500 or so vs. $1000 T&D's, so that would reduce the number further along with lower cost springs.
By the time you buy/port the stealths, buy good valve train and replace springs/retainers, the EDE MW are same money or less and have more room for growth, better chamber, etc.
Every product has it's target market. Nice thing about the stealth head is the look. However, you aren't going to fool anyone with a stock look BB mopar busting out 700hp. It's gotta a fouled plug line won't cut it! 
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Re: stealth heads?
[Re: 451Mopar]
#736140
07/01/10 07:22 PM
07/01/10 07:22 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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Quote:
This is sort of what I was getting at.
I think the CNC ported stealth heads are $997 each and flow about 320 cfm.
A pair of Victor M/W heads from Hughes is $1497 and I think they flow about 320 cfm out of the box (according to Edelbrock, 322 @ 0.600"?)
The Stealths do come with valve springs where the Victors don't, but the Stealth springs are not going to work with a cam that would make 700 HP numbers.
I think at the 700 HP level, both heads should be using high quality rocker systems, so the cost of the differnt rocker offsets is a wash, same for intake and exhaust.
you probably shouldn't get hung up on flow #'s. port cross section and chamber size and design have just as much to do with making power.
put the same level of porting in to both heads and the victor headed motor will make the stealth headed motor look like it's in reverse. indy SR and 440-1 heads don't flow big numbers out of the box either, but they smoke even the ported stealth and rpm head and have way more potential.
cubic feet of air is but one equation when it comes to making horsepower.
not coincidentally, of the engines i've read about with stealth or rpm heads that supposedly make 700 hp, i've yet to see any of them at the track back up what the dyno says. eventually it'll happen, but it hasn't yet.
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Re: stealth heads?
[Re: 73_dart_beast]
#736142
07/02/10 12:29 AM
07/02/10 12:29 AM
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Joined: May 2008
Posts: 5,399
Aurora, Colorado
451Mopar
master
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master
Joined: May 2008
Posts: 5,399
Aurora, Colorado
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Quote:
451, the ede victor head does look like the better deal for me. Who makes the best bang for the buck springs, rockers and shaft? The cam i am looking at is a solid roller cam 272/276 dur @.050, 620/620 lift with 1.5 and 661/661 lift with 1.6. I am thinking i want to use the 1.6 rockers. Is there a way to figure what the duration will be with the 1.6 rockers? Also because the vicktor head is taller will the extra hight be an issue in my 73 dart? Thanks for all the help yall are giving me...   
I don't know what the best bang for the buck parts are. The Victors have their own issues, mainly pushrod clearance and getting the correct offset rocker arms. As far as I know only the T&D and Harlan Sharp (Indy) rockers work. I think the HS Indy rockers are 0.800" offset and the T&D rockers are 0.725" offset. That is for the M/W ports, I think the standard port victors can use the Hughes 0.600" offset rockers. Remind me to get more rocker info next week. My machine shop is building a 528" megablock with M/W victor heads and it is a blower motor. That engine is using the harlan Sharpe rockers. I have the T&D 1.6:1 rockers and both rocker systems cost about $1,000, not cheap, but if your building a 700 HP engine (even with Stealth or RPM heads) you will want to use these brands of rockers, the less expensive rockers may work, but I think they will break or wear out much sooner. I am using the PAC1325 valve springs. I was going to use the 1225 springs but they were back ordered so i got a deal on the 1325 springs. Again, these are pricy, but they should last much longer than the Comp cams springs. Believe me, you don't want to float a valve and have it break the head off at 6,500 RPM!
This is the reason I had to build a new engine.
You did not say if this is a "B" or "RB" build?
I just got done building a 500" "B" (400 block) using the 440 source kit, the Victor M/W heads, and a mild Comp 264/264 @ 0.050", 0.714" lift cam.
originally I planned to use more cam, but the piston to valve clearances were getting tight, so if you go with a larger cam, you may want to mock up the engine before ballancing it just in cast the valve pockets need to be machined deeper.
I also used the BCR aluminum main caps and girdle to beef up the stock 400 block. As you can tell, this was not a "budget" engine build, but is less than some other "crate" engines in the same power range.
My next upcomming build is a 512" 440 source kit in a 0.030" over 440 block (really 505".) This is for my convertible which is street driven, so I don't need big HP numbers, and I want it to look fairly stock, so I am using the 440 stealth heads on it, and a hydraulic cam. I haven't decided on an intake, but maybe a six-pack so it will fit under the hood.
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