Re: WHICH ALUMINUM HEADS AND WHY?
[Re: LaRoy Engines]
#1242391
05/31/12 10:34 AM
05/31/12 10:34 AM
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Joined: Jun 2011
Posts: 1,039 ALBERTA CANADA
CUDA8U
OP
super stock
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OP
super stock
Joined: Jun 2011
Posts: 1,039
ALBERTA CANADA
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isn't the single plane only good til 500hp?
also just realized no one mentioned brodix heads
From personal experience:
M1 single plane 850 cfm Mighty Demon 451 cubic inch stroker, 9.5:1 compression 452 ported factory IRON heads 295 cfm @ .700"
just bought my holley 850 and my heads are STAGE 1 MUSCLE MOTORS "STREET KILLER" 250 cfm @ .500 LIFT ,CAST HEAD
10:1 COPRESSION COMP CAM 21-224-4 M1 SINGLE PLANE ROSS FLAT TOPS CAT RODS
In what application are you using these "STREET KILLER" heads? They would be a little soft for a big 493 street stroker.
The ones we ported were 90 cfm @ .100", 166 @ .200", 218 @ .300", 255 @ .400", 278 @ .500", 288 @ .600" and 295 @ .700".
As your stated goal was 550-600HP the RPM head is fine for a 493. The RPM heads do have the potential to go 750+ HP with good porting, but if you ever plan on that much horsepower, you would be better to start with a better head than the RPM.
the street killer cast heads are on there now and this is why i'm asking about aluminum heads,i know i can't reach my goal with these heads
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Re: WHICH ALUMINUM HEADS AND WHY?
[Re: CUDA8U]
#1242392
05/31/12 12:25 PM
05/31/12 12:25 PM
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Joined: Aug 2003
Posts: 43,309 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,309
Bend,OR USA
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I've dyno and raced motors with ported stock cast iron heads, stock Eddy RPM, CNC ported Eddy RPM, small 440 standard ports B1-BS, same B1-BS heads CNC ported to M.W., Indy SR with M.W. ports and 440-1 CNC ported. If you want more power later buy the best heads you can afford now, at least with M.W. port sizes
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: WHICH ALUMINUM HEADS AND WHY?
[Re: DPelletier]
#1242394
05/31/12 04:49 PM
05/31/12 04:49 PM
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Joined: Jun 2011
Posts: 1,039 ALBERTA CANADA
CUDA8U
OP
super stock
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OP
super stock
Joined: Jun 2011
Posts: 1,039
ALBERTA CANADA
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so it sounds like most are suggesting the eddy rpm heads.The fact that i don't have to buy after market valley pan,intake and headers is appealing.The only thing i've read is that the valve seating/alignment is off along with rockers....not sure i am considering the TTI headers though. 600hp would be my max since i don't plan on sittin at the track all the time,i like to cruise.Pump gas is a must since the $$$$$ for it is already crazy. Since my diff(742 case) is stock and i think the trans(both rebuilt) what would i have to upgrade on these to handle 550-600hp? i'm running street tires so real hard hook ups probably won't happen.
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Re: WHICH ALUMINUM HEADS AND WHY?
[Re: CUDA8U]
#1242397
05/31/12 10:02 PM
05/31/12 10:02 PM
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Joined: Jan 2007
Posts: 7,664 IN
ahy
master
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master
Joined: Jan 2007
Posts: 7,664
IN
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so it sounds like most are suggesting the eddy rpm heads.The fact that i don't have to buy after market valley pan,intake and headers is appealing.The only thing i've read is that the valve seating/alignment is off along with rockers....not sure
i am considering the TTI headers though.
600hp would be my max since i don't plan on sittin at the track all the time,i like to cruise.Pump gas is a must since the $$$$$ for it is already crazy.
Since my diff(742 case) is stock and i think the trans(both rebuilt) what would i have to upgrade on these to handle 550-600hp?
i'm running street tires so real hard hook ups probably won't happen.
On the valve alignment, its pretty common with any aftermarket heads or even stock heads with aftermarket rockers to need adjustment. On my Eddy's with Comp pro-magnum rockers, sweep over the valve was near perfect. Alignment along the shaft needed some tweaking. I had my MP aluminum hold downs milled a little on the sides to create extra clearance then used a couple packs of rocker shaft shims to dial in the rocker tip position.
The transmission and rear end should be fine on street tires. If you run slicks and hook, the rear is probably not going to be happy.
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Re: WHICH ALUMINUM HEADS AND WHY?
[Re: fourgearsavoy]
#1242400
06/01/12 10:41 AM
06/01/12 10:41 AM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
master
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master
Joined: Apr 2006
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West Plains, MO
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What about ported Stealths? I figure they would come around $1400 as well, but would it flow more than stock box RPMs?
Still not as good a deal as a set of EZ's that really respond to a minor cleanup with stock port window.You can get them around $2000.00 give or take a few hun depending on who you get them from.
The CNC-ported Stealths are $2000 a pair from 440source and the flow table looks good, 321 cfm at .650-up lift... how do the EZ's compare if they're the same price?
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Re: WHICH ALUMINUM HEADS AND WHY?
[Re: DrCharles]
#1242401
06/01/12 12:10 PM
06/01/12 12:10 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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What about ported Stealths? I figure they would come around $1400 as well, but would it flow more than stock box RPMs?
Still not as good a deal as a set of EZ's that really respond to a minor cleanup with stock port window.You can get them around $2000.00 give or take a few hun depending on who you get them from.
The CNC-ported Stealths are $2000 a pair from 440source and the flow table looks good, 321 cfm at .650-up lift... how do the EZ's compare if they're the same price?
My EZ's are not CNC ported as they were just cleaned up a bit. They are Max Wedge size and flow 340 @ .650. But I am surprised to see Steaths flow 321 @ .650 as I have not heard of them flowing that good. Ron
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Re: WHICH ALUMINUM HEADS AND WHY?
[Re: 383man]
#1242404
06/01/12 01:48 PM
06/01/12 01:48 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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What about ported Stealths? I figure they would come around $1400 as well, but would it flow more than stock box RPMs?
Still not as good a deal as a set of EZ's that really respond to a minor cleanup with stock port window.You can get them around $2000.00 give or take a few hun depending on who you get them from.
The CNC-ported Stealths are $2000 a pair from 440source and the flow table looks good, 321 cfm at .650-up lift... how do the EZ's compare if they're the same price?
My EZ's are not CNC ported as they were just cleaned up a bit. They are Max Wedge size and flow 340 @ .650. But I am surprised to see Steaths flow 321 @ .650 as I have not heard of them flowing that good. Ron
Here are the flows from our bench on the out-of-the-box standard Stealth and then after some serious porting. It is why I say if you already have ANY aftermarket aluminum head, you don't need to buy another head to get 750 HP. Why buy another head that you will still have to port to get 750 HP if you already own a set of aluminum heads? If the Stealths can do it, which heads can't?
Lift.........OOTB Stealth......LaRoy Ported Stealth
.100"...........66....................71cfm .200"..........142...................153 .300"..........205...................217 .400"..........240...................265 .450"..................................287 .500"..........255...................301 .550"..................................325 .600"..........267...................333 .650"..................................339 .700"..........268...................344 .750"..................................348
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