Torkmnstr
Well-Known Member
As the title says are the stealth heads a good buy? I see they have the super heads too, but they are the same price as the base models what is the difference? These will be going on my 440, thanks for the info all.
Stealth heads good or bad?
- Thread starter Torkmnstr
- Start date
moparsteve636
Well-Known Member
The heads are a good buy for the price!But if you are going to use them on a serious race engine!You should get rid of the chinese keepers, retainers and springs ! I found out the hard way,pulled a keeper and dropped the valve! 5 others were going away also! The super head is a bare head,I think it has larger ports.
bigmanjbmopar
Newb with a view
I have a set of the stealth heads and they are fine, had to ream a little bit of material out where the push rods goes just to make sure there was no rub but other than that they work great with the 1.5 ratio rockers. If I had them ported and polished I'm sure I could squeeze even more flow and HP out of them. I am happy with them for street use they stay cool and have all the factory mounting holes etc. For the money I think they are well worth it for street use. If you can get passed the fact they are cast in china but assembled here some can't some can. Good luck in your research and decision. :headbang:
65 Plymouth Satellite 426
Well-Known Member
440Source Stealth Heads Work Just Fine! The Only Thing I Did To Mine, Was To Put Manley Severe Duty Valves In It!
robinsonwr
Well-Known Member
Bigmanjbmopar,
The rocker assembly hold downs are they MP or 440Source?
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I have a set of Stealth heads for my 440/512 build. I think for the price you would have a hard time building or freshing up a set of cast iron heads for the same price. As for changing the valve train components I changed mine because of the hydraulic roller camshaft that was chosen. I feel they are a good choice for an entry level performance head. Don't get me wrong I think with the right CNC or port work they can perform with its after market counterparts in the right setting.
The rocker assembly hold downs are they MP or 440Source?
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I have a set of Stealth heads for my 440/512 build. I think for the price you would have a hard time building or freshing up a set of cast iron heads for the same price. As for changing the valve train components I changed mine because of the hydraulic roller camshaft that was chosen. I feel they are a good choice for an entry level performance head. Don't get me wrong I think with the right CNC or port work they can perform with its after market counterparts in the right setting.
IQ52
Well-Known Member
They are good if you prepare them properly.
They are bad if you prepare them poorly.
OOTB they are they worst flowing of all the aftermarket aluminum heads but better than any stock factory iron head. They can be ported to flow 340-350 cfm just as the Edelbrock Performer RPM heads. Every aluminum head on the market should be checked for defects, guide/valve clearance, seat/valve roundness, proper installed heights, spring pressures and deck flatness. ANY OF THEM should be checked, ANY.
They are bad if you prepare them poorly.
OOTB they are they worst flowing of all the aftermarket aluminum heads but better than any stock factory iron head. They can be ported to flow 340-350 cfm just as the Edelbrock Performer RPM heads. Every aluminum head on the market should be checked for defects, guide/valve clearance, seat/valve roundness, proper installed heights, spring pressures and deck flatness. ANY OF THEM should be checked, ANY.
benno440
Well-Known Member
"OOTB they are they worst flowing of all the aftermarket aluminum heads"
IQ52 correct me if i am wrong but i have read the specs of the stealth heads against the edelbrock performer heads and they flow much better then them, so your quote may be wrong?
heres edelbrock
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whoa sorry dont know what happened there
IQ52 correct me if i am wrong but i have read the specs of the stealth heads against the edelbrock performer heads and they flow much better then them, so your quote may be wrong?
| Intake Port Flow (at peak ~600 lift): | 290CFM @ 28" of water |
| Intake Port CC: | 212CC* |
| Intake Valve Head Size: | 2.14" |
| Intake Valve Stem Size: | 11/32", undercut near valve head. |
| Intake Valve Guide Type: | .530" OD Manganese Bronze |
| Intake Valve Seals Type: | Positive Locking type, maintains contact at all times with the valve and guide, reduced diameter compatible with most dual valve springs. |
| Intake Valve Type: | 1 piece forged 21-4N stainless, swirl polished heads, hardened tips. |
| Intake Valve Locks | 7 degree, single groove, chrome-moly steel, case hardened. Recommended for maximum .510" lift. |
| Exhaust Port Flow (at peak ~600 lift): | 220CFM @ 28" of water |
| Exhaust Port CC: | 72CC* |
| Exhaust Valve Head Size: | 1.81" |
| Exhaust Valve Type: | 1 piece forged 21-4N stainless, swirl polished heads, hardened tips. |
| Exhaust Valve Locks | 7 degree, single groove, chrome-moly steel, case hardened. Recommended for maximum .510" lift. |
| Exhaust Valve Stem Size | 11/32", undercut near valve head. |
| Exhaust Valve Seals Type: | Positive Locking type, maintains contact at all times with the valve and guide, reduced diameter compatible with most dual valve springs. |
| Exhaust Valve Guide Type: | .530" OD Manganese Bronze |
| Valve Spring Type: | Single with Damper. Recommended for maximum .600" lift. |
| Valve Spring Closed (seat) Pressure: | Approx. 130 pounds @ 1.875" installed height |
| Valve Spring Open Pressure | Approx. 330 pounds @ 1.275" (.600" lift.) |
| Valve Spring Inner Diameter: | 1.050" |
| Valve Spring Maximum Lift: | .600" |
| Valve Spring Coil Bind Height: | 1.130" |
| Valve Spring Outer Diameter: | 1.550" |
| Valve Spring Free Height | 2.400" |
| Valve Spring Installed Height: | 1.875" |
| Valve Spring Wire Diameter: | .202" |
| Valve Spring Number of Coils: | 5.5 |
| Deck Thickness: | .625" |
| Chamber Volume: | 80CC* |
| Chamber Type: | Closed (with quench surface) |
| Weight (bare): | 22 pounds |
| Weight (assembled): | 29 pounds |
| Aluminum Type | A-356 |
heres edelbrock
| Combustion chamber volume | 84cc & 88cc |
| Intake runner volume | 210cc |
| Exhaust runner volume | 70cc |
| Intake valve diameter | 2.140" |
| Exhaust valve diameter | 1.81" |
| Valve stem diameter | 11/32" |
| Valve guides | Manganese bronze |
| Deck thickness | 5/8" |
| Valve spring diameter | 1.55" |
| Valve spring maximum lift | .600" |
| Rocker stud | N/A |
| Guideplate | N/A |
| Pushrod diameter | 3/8" |
| Valve angle | 15° |
| Exhaust port location | Stock |
| Spark plug fitment | 14mm x 3/4 reach, gasket seat |
| Made In | USA |
| Combustion chamber volume | 84cc & 88cc |
| Intake runner volume | 210cc |
| Exhaust runner volume | 70cc |
| Intake valve diameter | 2.140" |
| Exhaust valve diameter | 1.81" |
| Valve stem diameter | 11/32" |
| Valve guides | Manganese bronze |
| Deck thickness | 5/8" |
| Valve spring diameter | 1.55" |
| Valve spring maximum lift | .600" |
| Rocker stud | N/A |
| Guideplate | N/A |
| Pushrod diameter | 3/8" |
| Valve angle | 15° |
| Exhaust port location | Stock |
| Spark plug fitment | 14mm x 3/4 reach, gasket seat |
| Made In | USA |
| Intake Port Flow (at peak ~600 lift): | 290CFM @ 28" of water |
| Intake Port CC: | 212CC* |
| Intake Valve Head Size: | 2.14" |
| Intake Valve Stem Size: | 11/32", undercut near valve head. |
| Intake Valve Guide Type: | .530" OD Manganese Bronze |
| Intake Valve Seals Type: | Positive Locking type, maintains contact at all times with the valve and guide, reduced diameter compatible with most dual valve springs. |
| Intake Valve Type: | 1 piece forged 21-4N stainless, swirl polished heads, hardened tips. |
| Intake Valve Locks | 7 degree, single groove, chrome-moly steel, case hardened. Recommended for maximum .510" lift. |
| Exhaust Port Flow (at peak ~600 lift): | 220CFM @ 28" of water |
| Exhaust Port CC: | 72CC* |
| Exhaust Valve Head Size: | 1.81" |
| Exhaust Valve Type: | 1 piece forged 21-4N stainless, swirl polished heads, hardened tips. |
| Exhaust Valve Locks | 7 degree, single groove, chrome-moly steel, case hardened. Recommended for maximum .510" lift. |
| Exhaust Valve Stem Size | 11/32", undercut near valve head. |
| Exhaust Valve Seals Type: | Positive Locking type, maintains contact at all times with the valve and guide, reduced diameter compatible with most dual valve springs. |
| Exhaust Valve Guide Type: | .530" OD Manganese Bronze |
| Valve Spring Type: | Single with Damper. Recommended for maximum .600" lift. |
| Valve Spring Closed (seat) Pressure: | Approx. 130 pounds @ 1.875" installed height |
| Valve Spring Open Pressure | Approx. 330 pounds @ 1.275" (.600" lift.) |
| Valve Spring Inner Diameter: | 1.050" |
| Valve Spring Maximum Lift: | .600" |
| Valve Spring Coil Bind Height: | 1.130" |
| Valve Spring Outer Diameter: | 1.550" |
| Valve Spring Free Height | 2.400" |
| Valve Spring Installed Height: | 1.875" |
| Valve Spring Wire Diameter: | .202" |
| Valve Spring Number of Coils: | 5.5 |
| Deck Thickness: | .625" |
| Chamber Volume: | 80CC* |
| Chamber Type: | Closed (with quench surface) |
| Weight (bare): | 22 pounds |
| Weight (assembled): | 29 pounds |
| Aluminum Type | A-356 |
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whoa sorry dont know what happened there
RustyRatRod
Well-Known Member
Advertised flow numbers are one thing. Flow bench numbers another. I seriously doubt IQ52 is wrong.
IQ52
Well-Known Member
Well, I have personally tested the flow of the Stealth vs the Performer RPM on the same flow bench.
lift................RPM.................Stealth
.100.............73.....................66
.200............148...................142
.300............209...................205
.400............254...................240
.500............276...................255
.600............287...................267
.700............291...................268
lift................RPM.................Stealth
.100.............73.....................66
.200............148...................142
.300............209...................205
.400............254...................240
.500............276...................255
.600............287...................267
.700............291...................268
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IQ52/Jim have you got a hold of any of the E-Street Edelbrocks BB Wedge Aluminum Heads, 75cc combustion chamber, 210cc intake port, 2.14"intake &1.81"exhaust valves, supposedly 291cfm flow, OOTB, for $979.95 a set heads yet... If you have, so how did they check out & flow ?? just curious, they could be another great alternative for a mild build @ an affordable price, comparable to the Stealths... I know you & Cody, at LaRoy Engines out of Challis Idaho, are the experts & go to guys when it comes honest assessments, to parts, specs, flows & getting the most out of any type cylinder heads, aluminum or cast iron, Chinese or American made... Your PITA buddy, thanks in advance, I'll bet "you knew" this was coming...
bigmanjbmopar
Newb with a view
Jeremiah
Well-Known Member
When you throw out these 340-350 CFM number it is important to explain that this is generally an unrealistic number for these heads. 320 CFM on the intake is realistic.
bigmanjbmopar
Newb with a view
Says the bullfrog....:upside down:
IQ52
Well-Known Member
My dear Jeremiah,
320 is general, and 340-350 is very realistic. You have seen the stock flows I posted on 10-19-2012, 12:20 PM. Here are our flows after porting.
Lift...................Stealth.......................RPM
.100"..................71............................75
.200"................153...........................152
.300"................217...........................217
.400"................265...........................267
.500"................301...........................301
.550"................325...........................322
.600"................333...........................331
.650"................339...........................343
.700"................344...........................348
.750"................348...........................352
Heads like these have consistantly gone 770+ HP on our normally aspirated pump gas 451 stroker.
Jeremiah
Well-Known Member
Let me take that back and apologize for my wording. Would it not be cost prohibitive for someone to buy these heads with that level of work compared to a different head with less work if that makes sense? Your work is impressive for certain. I wonder what you guys could do with a set of CNC'd MW victors?
IQ52
Well-Known Member
Yes, it would be cost prohibitive to buy these heads new, with that level of work. If someone ALREADY owns ANY aftermarket aluminum head then the porting option becomes viable into the 700 HP range. It will cost less to have the head ported than it will cost to buy new heads.
If you wish get into the 350 cfm range, you have to port any new head to get there. No aftermarket aluminum head I know of will go there as cast, they all must be ported. So you must bear the cost of buying the head and having it ported. If you wish to go beyond, say 650 HP, always start with something other than the Stealth or RPM. But if you already have them, you can, if you want, get 750 HP with them for less than the cost of new ported heads.
Our hand ported Victors, 500 ci, single 4bbl, normally aspirated.
[video=youtube;EbZ8jGq6x1c]http://www.youtube.com/watch?v=EbZ8jGq6x1c[/video]
If you wish get into the 350 cfm range, you have to port any new head to get there. No aftermarket aluminum head I know of will go there as cast, they all must be ported. So you must bear the cost of buying the head and having it ported. If you wish to go beyond, say 650 HP, always start with something other than the Stealth or RPM. But if you already have them, you can, if you want, get 750 HP with them for less than the cost of new ported heads.
Our hand ported Victors, 500 ci, single 4bbl, normally aspirated.
[video=youtube;EbZ8jGq6x1c]http://www.youtube.com/watch?v=EbZ8jGq6x1c[/video]
Jeremiah
Well-Known Member
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
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
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