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440 Source Stealth Heads #918345 01/31/11 10:53 PM 01/31/11 10:53 PM
Joined: Dec 2008 Posts: 2,782 USA J JoesMopar OP master
JoesMopar OP master J Joined: Dec 2008 Posts: 2,782 USA	Would these heads be good on a mild 383? I'm thinking KB flat tops, XE274 cam, stock rockers, Performer RPM intake and headers. Originally I was wanting to do a budget build, but I might want to get these if anything to use on another project at some point. I want to use the parts I listed to keep my budget in check. I just thought I was going to have to spend money to have the 906's rebuilt anyway so I might as well get something I can use somewhere else if I want. Would anyone also know what my Compression Ratio would be? Not sure of the head gasket thickness yet, and as far as I know it will have a stock deck height (if anyone could recommend a measurement to mill the block would help). Thanks

Re: 440 Source Stealth Heads [Re: JoesMopar] #918346 01/31/11 11:58 PM 01/31/11 11:58 PM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	been considering a set myself & guys (on here) have opinionated that the best way to go is to have em CNC ported and to have the valve job/valves etc checked over well. The alum wicks off heat so you would need higher CR. Nothing real specific here but wanted to give you a btt bump Last edited by RapidRobert; 02/01/11 01:11 AM. live every 24 hour block of time like it's your last day on earth

Re: 440 Source Stealth Heads [Re: RapidRobert] #918347 02/01/11 12:00 AM 02/01/11 12:00 AM
Joined: Jul 2008 Posts: 30,424 Florida STAYcation dOrk ! The village idiot's idiot
dOrk ! The village idiot's idiot Joined: Jul 2008 Posts: 30,424 Florida STAYcation	Quote: The alum wicks off heat so you would need higher CR. ....x 2 .. A LOT higher CR.

Re: 440 Source Stealth Heads [Re: dOrk !] #918348 02/01/11 01:32 AM 02/01/11 01:32 AM
Joined: Mar 2003 Posts: 4,848 Memphis HemiRick master
HemiRick master Joined: Mar 2003 Posts: 4,848 Memphis	its general rule to build a motor w 1 point higher comp w alum heads. Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451

Re: 440 Source Stealth Heads [Re: dOrk !] #918349 02/01/11 02:30 AM 02/01/11 02:30 AM
Joined: Jan 2003 Posts: 21,072 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,072 Niles , Ohio	On a mild build they should be good without porting.I have them on my 440 with 12.5 domes.I did change locks,springs and retainers because of the radical cam and solids with 4 speed.Mine have been worked some.No complaints after 3 years.Rocky Chrysler Firepower

Re: 440 Source Stealth Heads [Re: JoesMopar] #918350 02/01/11 08:55 AM 02/01/11 08:55 AM
Joined: Nov 2004 Posts: 843 Suffolk,VA I ireland383 super stock
ireland383 super stock I Joined: Nov 2004 Posts: 843 Suffolk,VA	They will be fine, but as said you need to up the compression. I'm using the KB400 .040 pistons .024 below the deck and running a Comp cams 275DEH 235/482, Holley 3310, 1 3/4 headers, 3:55 sure grip, and 2400 stall. My heads were cc'd at 86 and I had them milled .030 bringing them to 80. I'm at 9.9 to 1 compression. Camquest says 430 horsepower. I'm thinking more like 400. You need to measure first the actual comp. now. You could mill your block .020 and be .004 below the deck and use the .039 Felpro gasket. Last edited by ireland383; 02/01/11 02:04 PM.

Re: 440 Source Stealth Heads [Re: ireland383] #918351 02/01/11 09:12 AM 02/01/11 09:12 AM
Joined: Jan 2003 Posts: 21,072 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,072 Niles , Ohio	Dont just bolt them on either.Have a good shop check them first.Its money well spent.Rocky Chrysler Firepower

Re: 440 Source Stealth Heads [Re: therocks] #918352 02/01/11 11:27 AM 02/01/11 11:27 AM
Joined: Jan 2003 Posts: 15,551 Norwich CT USA moparts I Live Here
moparts I Live Here Joined: Jan 2003 Posts: 15,551 Norwich CT USA	Quote: Have a good shop check them first.Its money well spent.Rocky Yes, My Stealth heads were excellent, good seats everything looked good BUT they were assembled dry as in no oil on the guides at all So if they had NOT been checked they would have been dry started the valve guides, either seized or excessive wear. Un-ported out of the box Stealth / Edelbrock flow better than any stock or even mildly ported big block head Tom , 2011 Ram 3500 C&C Diesel 2009 Challenger R/T 1971 Challenger Conv. 511/4 speed 1970 Challenger R/T 503/727

Re: 440 Source Stealth Heads [Re: JoesMopar] #918353 02/01/11 11:35 AM 02/01/11 11:35 AM
Joined: Apr 2007 Posts: 2,826 NY usa 5 540challenger master
540challenger master 5 Joined: Apr 2007 Posts: 2,826 NY usa	Doesn anyone have any dyno time on the cast verse ALum head HP loss. There was a chevy write up on Cast iron VS ALum head "same casting but different metals" and the difference was little to none. I think the big difference in HP loss with ALum is when running the All Alum. engines and only in the big HP range to have any major drop in HP found the write up http://www.carcraft.com/techarticles/ccr...no_results.html Last edited by 540challenger; 02/01/11 11:37 AM.

Re: 440 Source Stealth Heads [Re: HemiRick] #918354 02/01/11 11:38 AM 02/01/11 11:38 AM
Joined: Jan 2003 Posts: 5,902 Athens, Greece Pyper70 master
Pyper70 master Joined: Jan 2003 Posts: 5,902 Athens, Greece	Quote: its general rule to build a motor w 1 point higher comp w alum heads. So taking a 440 (10:1) with 906 heads, popping em off and putting on Eddy heads would lead to problems? Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s

Re: 440 Source Stealth Heads [Re: Pyper70] #918355 02/01/11 11:46 AM 02/01/11 11:46 AM
Joined: Apr 2007 Posts: 2,826 NY usa 5 540challenger master
540challenger master 5 Joined: Apr 2007 Posts: 2,826 NY usa	Quote: Quote: its general rule to build a motor w 1 point higher comp w alum heads. So taking a 440 (10:1) with 906 heads, popping em off and putting on Eddy heads would lead to problems? NO with Alum heads you can run a point higher and run on pump gas is the general rule. However every engine combo is different so i wouldn't even use that rule.

Re: 440 Source Stealth Heads [Re: Pyper70] #918356 02/01/11 12:30 PM 02/01/11 12:30 PM
Joined: Oct 2005 Posts: 8,872 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,872 Ontario, Canada	Quote: So taking a 440 (10:1) with 906 heads, popping em off and putting on Eddy heads would lead to problems? Problems? No. HP loss ... hard to say. If you were comparing two IDENTICAL castings where the only difference was cast iron vs aluminum then there might be a HP loss with the aluminum because of heat loss. However, there is no aluminum head that is a plain ol' copy of an iron head. Even the base 440Source head flows better out of the box, has larger valves than stock and will provide higher compression with its closed 80cc chamber design. There's no reason bolting on any aluminum head should cause any power loss unless the head is a clear mis-match to the application - like bolting a B1 head on a stock 440 !!

Re: 440 Source Stealth Heads [Re: JoesMopar] #918357 02/01/11 01:26 PM 02/01/11 01:26 PM
Joined: Aug 2005 Posts: 4,799 ILL M MLR426 master
MLR426 master M Joined: Aug 2005 Posts: 4,799 ILL	Quote: Would these heads be good on a mild 383? I'm thinking KB flat tops, XE274 cam, stock rockers, Performer RPM intake and headers. Originally I was wanting to do a budget build, but I might want to get these if anything to use on another project at some point. I want to use the parts I listed to keep my budget in check. I just thought I was going to have to spend money to have the 906's rebuilt anyway so I might as well get something I can use somewhere else if I want. Would anyone also know what my Compression Ratio would be? Not sure of the head gasket thickness yet, and as far as I know it will have a stock deck height (if anyone could recommend a measurement to mill the block would help). Thanks Only do a light clean up on the valve pockets, unshroud the valves a bit in chambers and do a gasket match on intake side. No reason to enlarge the port to big, will only work against you with the cam size. You need to change the locks, retainers, and springs to fit the more agressive lobe of the XE274 put springs in around 120 on the seat and remember to use Brad Penn 30 weight or equal oil for break in. Check retainer to guide top clearance with seals. Also advance the cam 4 degrees and make sure you have enough gear and convertor if automatic. Compression ? have your machine shop look at what pistons are available at what compression with the head cc. you will possibly have to mill the heads to get better compression ratio. logan426

Re: 440 Source Stealth Heads [Re: Stanton] #918358 02/01/11 01:38 PM 02/01/11 01:38 PM
Joined: Feb 2003 Posts: 7,982 Scranton, PA Montclaire master
Montclaire master Joined: Feb 2003 Posts: 7,982 Scranton, PA	Quote: However, there is no aluminum head that is a plain ol' copy of an iron head. What were the old Stage IV heads? I never liked the Edelbrocks from an aesthetic sense. I thought that someone was producing a stock appearing aluminum head though? MP? Last edited by Montclaire; 02/01/11 01:54 PM.

Re: 440 Source Stealth Heads [Re: Montclaire] #918359 02/01/11 02:24 PM 02/01/11 02:24 PM
Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH WILD BILL Senior Member of the Junior Dragster Club
WILD BILL Senior Member of the Junior Dragster Club Joined: Dec 2007 Posts: 10,542 BROOK PARK, OH	The Stealth is the stock appearing alum head

Re: 440 Source Stealth Heads [Re: MLR426] #918360 02/01/11 10:18 PM 02/01/11 10:18 PM
Joined: Dec 2008 Posts: 2,782 USA J JoesMopar OP master
JoesMopar OP master J Joined: Dec 2008 Posts: 2,782 USA	Thanks for the advice. I thought these heads were a bolt on and go? It sounds like alot of swapping parts that are already assembled on the head. I don't like the idea of swapping the locks, retainers and springs to fit in an XE274 cam which isn't much bigger than the stock one, it seems for $1000 these heads should be able to support that right out of the box. So far the vibe I get is these heads are junk.

Re: 440 Source Stealth Heads [Re: JoesMopar] #918361 02/01/11 10:51 PM 02/01/11 10:51 PM
Joined: Nov 2004 Posts: 843 Suffolk,VA I ireland383 super stock
ireland383 super stock I Joined: Nov 2004 Posts: 843 Suffolk,VA	Quote: Thanks for the advice. I thought these heads were a bolt on and go? It sounds like alot of swapping parts that are already assembled on the head. I don't like the idea of swapping the locks, retainers and springs to fit in an XE274 cam which isn't much bigger than the stock one, it seems for $1000 these heads should be able to support that right out of the box. So far the vibe I get is these heads are junk. That cam isn't even over 500 lift IIRC. All the stuff on those heads will handle that cam easily. As with any aftermarket head you should have them checked. By the way my machinist checked mine over and was very impressed (changed nothing). Last edited by ireland383; 02/02/11 08:29 AM.

Re: 440 Source Stealth Heads [Re: ireland383] #918362 02/01/11 11:01 PM 02/01/11 11:01 PM
Joined: Jan 2006 Posts: 587 IL . usa C cjs69mope mopar
cjs69mope mopar C Joined: Jan 2006 Posts: 587 IL . usa	Quote: They will be fine, but as said you need to up the compression. I'm using the KB400 .040 pistons .024 below the deck and running a Comp cams 275DEH 235/482, Holley 3310, 1 3/4 headers, 3:55 sure grip, and 2400 stall. My heads were cc'd at 86 and I had them milled .030 bringing them to 80. I'm at 9.9 to 1 compression. Camquest says 430 horsepower. I'm thinking more like 400. You need to measure first the actual comp. now. You could mill your block .020 and be .004 below the deck and use the .039 Felpro gasket. This is the exact combo i have in 68 charger i have .047 quench with .039 felpro , but i have the block decked and comp cams 275 HL cam and 2800-3000m ptc converter , runs kick ass w 750 hp vacumm secondary . 1969 Dodge Charger 1969 Dodge Superbee

Re: 440 Source Stealth Heads [Re: cjs69mope] #918363 02/02/11 12:11 AM 02/02/11 12:11 AM
Joined: Oct 2005 Posts: 8,872 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,872 Ontario, Canada	The parts on those heads are certainly no worse than stock parts. With the cam you intend to use I'd go with the heads as they come but I'd have the valve job checked out for sure. If your budget can handle it, have 440Source upgrade the retainers and locks and you'll never have a worry.

Re: 440 Source Stealth Heads [Re: Stanton] #918364 02/02/11 10:35 PM 02/02/11 10:35 PM
Joined: Dec 2008 Posts: 2,782 USA J JoesMopar OP master
JoesMopar OP master J Joined: Dec 2008 Posts: 2,782 USA	This is a pretty ignorant question, but what do the locks and retainers have to do with the cam? I understand the springs completely, but how do you know what locks and retainers work on which cams?

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