Stealth heads good or bad?

[Budnicks]

Were these MW port window heads, and I am going to assume a 4500 series carb.

Out of curiosity, what would a guy be looking at price wise for a standard "stage 3" type of port job on a Stealth/RPM? What would be the additional fee to get them to the 350ish CFM number?

Do you by any chance have published numbers on MW port window Victors?

Thank you,

Jeremiah

There are a bunch of threads over at Mopar Muscle Mag. forum, look for something like under the Search Mopar Muscle top-right of the forum home page, Aluminum heads, Ported Cast Iron Vs Out of the Box Aluminum heads, Stealth Aluminum Heads, Edelbrock RPM Aluminum Heads, Porting Aluminum heads, Stealth or RPM Porting Flow Numbers, Edelbrock Victor Aluminum heads flow numbers, Are these -____- heads any good, blah blah blah, the same type question over & over, etc. or some form/combonation of those titles, either under my handle Budnicks or 3836bbl or IQ52 or HeyOldGuy or 451mopar or 71redneckstroker & others, you will find a plethora of posts & threads about the very subject & all his numbers, so he doesn't have to post them all over again, it's a ton of work, if you find them, maybe you can share a link here, I rarely go there any more, this place is a far better forum...good luck

 

[RustyRatRod]

I hear that 71redneckstroker guy is a real piece of work. lol

 

[Budnicks]

I hear that 71redneckstroker guy is a real piece of work. lol

Yep he is...LOL...

 

[Jeremiah]

There are a bunch of threads over at Mopar Muscle Mag. forum, look for something like under the Search Mopar Muscle top-right of the forum home page, Aluminum heads, Ported Cast Iron Vs Out of the Box Aluminum heads, Stealth Aluminum Heads, Edelbrock RPM Aluminum Heads, Porting Aluminum heads, Stealth or RPM Porting Flow Numbers, Edelbrock Victor Aluminum heads flow numbers, Are these -____- heads any good, blah blah blah, the same type question over & over, etc. or some form/combonation of those titles, either under my handle Budnicks or 3836bbl or IQ52 or HeyOldGuy or 451mopar or 71redneckstroker & others, you will find a plethora of posts & threads about the very subject & all his numbers, so he doesn't have to post them all over again, it's a ton of work, if you find them, maybe you can share a link here, I rarely go there any more, this place is a far better forum...good luck

I was asking about work that comes out their shop shop, not general numbers. When I hear a shop coming up with big flow numbers (higher than most of the shops I deal with) I am interested to hear what they are doing with other heads. Here is the link to the well known master database of cylinder head flow numbers:

http://users.erols.com/srweiss/tablehdc.htm#Chrysler_Big_Block

Thank you for the instruction on how to surf the internet, the were very helpful. If copying and pasting a table of flow numbers is a lot of work I'm not really sure what to say about that.

 

[Budnicks]

I was asking about work that comes out their shop shop, not general numbers. When I hear a shop coming up with big flow numbers (higher than most of the shops I deal with) I am interested to hear what they are doing with other heads. Here is the link to the well known master database of cylinder head flow numbers:

http://users.erols.com/srweiss/tablehdc.htm#Chrysler_Big_Block

Thank you for the instruction on how to surf the internet, the were very helpful. If copying and pasting a table of flow numbers is a lot of work I'm not really sure what to say about that.

Smart *** replies don't help anyone, the posts I was refering to were all Jim & Cody LaRoys Engine work & numbers, for the most part... your welcome

 

[bigmanjbmopar]

It is interesting to see the numbers compared are really so small between them. I wouldn't be able to feel the difference in my foot. That said I bought my stealth heads with the future idea of having them cnc'ed and port matched etc to gain an additional 100 hp when I was ready for it.

I still think the stealth heads are a good deal overall. jmo

 

[RustyRatRod]

Smart *** replies don't help anyone, the posts I was refering to were all Jim & Cody LaRoys Engine work & numbers, for the most part... your welcome

You know what they say. You can lead a jackass to water.......

 

[Jeremiah]

Smart *** replies don't help anyone, the posts I was refering to were all Jim & Cody LaRoys Engine work & numbers, for the most part... your welcome

For what it is worth, I do not see any numbers on the cost of porting a set of RPM heads to 350+ CFM or Fully ported MW Victor flow numbers. Is this my public education coming through again?

 

[451Mopar]

As mentioned, out of the box, the Stealth heads don't flow their advertised numbers. I have the Stealth heads on a 505" stroked 440. I used them because i wanted the stock look. I did some porting on the heads, mostly cleaning up the bowl to valve seat inserts, and had a 3-angle valve job done and they flowed OK.
Lift Intake Exhaust
0.100" / 82 / 81
0.200" / 157 / 127
0.300" / 221 / 151
0.400" / 260 / 174
0.500" / 278 / 190
0.600" / 283 / 200
0.700" / 289 / 211
0.800" / 289 / 215

The port window around the pushrod pinch area would need some work to get the flow up more.

For the street The Edelbrock RPMs are better out of the box, but don't look stock.
For performance The Victor or Indy heads are a better starting point.

 

[RustyRatRod]

Jim, I have a question for you. Is there such a thing as "too much head"? In other words, lets say I bought a pair of Victors, had Jerry port them all out. Put them on my 10.5 383 with my 271 @ .050 solid cam. Would the engine only pull as much as it needed, or would the heads somehow be "too much"? I ask because I will likely be upgrading to a more serious stroker later and wondered if I could simply go ahead and get the good heads now and reuse them on the big stroker later. If that will not work, I will simply forge ahead with my 516s. Thanks.

 

[IQ52]

For what it is worth, I do not see any numbers on the cost of porting a set of RPM heads to 350+ CFM or Fully ported MW Victor flow numbers. Is this my public education coming through again?

Sorry boys and girls, sometimes I have other things to do rather than spend time on the forums. Got a big exhaust leak between the head and the turbo on the hauler. I thought it was more important.

Stage III porting (what ever that is) 320 cfm, $1000. 340+ cfm $1800.

Victor head flows, depending on how we set them up, the most recent tests went:

Lift..................OOTB.......................Test 1.......................Test 2

.100..................71.............................87.............................72
.200.................144...........................161...........................151
.300.................202...........................220...........................215
.400.................245...........................261...........................259
.500.................281...........................306...........................306
.600.................308...........................343...........................347
.700.................313...........................358...........................368
.800.................321...........................372...........................378

- - - Updated - - -

Jim, I have a question for you. Is there such a thing as "too much head"? In other words, lets say I bought a pair of Victors, had Jerry port them all out. Put them on my 10.5 383 with my 271 @ .050 solid cam. Would the engine only pull as much as it needed, or would the heads somehow be "too much"? I ask because I will likely be upgrading to a more serious stroker later and wondered if I could simply go ahead and get the good heads now and reuse them on the big stroker later. If that will not work, I will simply forge ahead with my 516s. Thanks.

I will be destroyed by the traditionalists for this, but it is my opinion that your 383 will love you for using the ported Victor heads now.

 

[RustyRatRod]

I will be destroyed by the traditionalists for this, but it is my opinion that your 383 will love you for using the ported Victor heads now.

That's all I needed to hear. Thanks, Jim. Sometimes I forget this is what you do for a living. You're always offering information for free for people when they'll listen. I do appreciate it.

 

[451Mopar]

Jim, I have a question for you. Is there such a thing as "too much head"? In other words, lets say I bought a pair of Victors, had Jerry port them all out. Put them on my 10.5 383 with my 271 @ .050 solid cam. Would the engine only pull as much as it needed, or would the heads somehow be "too much"? I ask because I will likely be upgrading to a more serious stroker later and wondered if I could simply go ahead and get the good heads now and reuse them on the big stroker later. If that will not work, I will simply forge ahead with my 516s. Thanks.

There is such a thing as too much port size. You don't want to make the port larger than necessary because it will hurt port velocity, and the velocity is important for packing the cylinder when the piston is moving back up the cylinder with the intake valve still open.
The McFarland formula is a good starting point. I believe it figures Peak torque RPM by calculating what RPM the velocity is about 0.5 Mach (trying to recall from memory, so I could be wrong?) the formula is RPM = intake port cross section x 88200 / cylinder volume.
Cylinder volume for a 383 is about 61cid, and if the minimum port cross section is 95% of the intake manifold gasket (2.72"x1.40" for the Max wedge port) the theoretical peak torque RPM for a 383 is 4,969 RPM. Ported to 100% or the gasket size RPM is 5,506 RPM. With your 271 cam this should not be a problem if using a hi-stall converter. A 512 stroker will drop those RPM by about 700 RPM.