440 Source Head Opinions?

Big Block A body Tech

  1. Jarlaxle

    Jarlaxle Well-Known Member

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    Let's see one of them survive Drag Week.
     
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    • Jarlaxle

      Jarlaxle Well-Known Member

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      And if you're lucky, they've seen a set of 906 or 452s before.
       
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      • Jarlaxle

        Jarlaxle Well-Known Member

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        No, you're not.
         
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        • LocuMob

          LocuMob Fluid Technician

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          I'm sure he got the metallurgy results directly.
           
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          • threewood

            threewood Well-Known Member

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            I'll say again that I like my Stealth heads. And I drive my car. Hard. I had them cnc ported, valve job,, springs, keepers, locks replaced to keep up with my Hughes STL3842 solid lifter cam. I've walked away from several newer Camaro ss and Mustang GTs. They are a solid option to consider along with TF and Edelbrock.
             
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            • parksr5

              parksr5 New Member

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              Long time lurker here, I'm mostly on Moparts, FBBO, etc.

              Reviewed all 9 pages of detail and found something funny, that no one called out, that makes me giggle.

              Summation of one portion of this conversation: Merica, buy Merican, China is the devil, Mericans should be ashamed of themselves for buying Chinese parts; hey, check out this cool Japanese, rotary car that I used to own. :rofl:
               
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              • MOPARMAGA

                MOPARMAGA FABO Gold Member FABO Gold Member

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                Oh, not to mention they're our ideas the Chinese are copying. I don't care how fast a rotary can go...they're still not cool to me & 99.9% of the dudes here.
                Chicomm government evil, Chinese people not evil
                 
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                • Lowcar

                  Lowcar Well-Known Member

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                  nice first post interesting choice of words obviously meant to agitate [giggle,summation,Merica] if you can quit giggling long enough please post details of your mopar
                   
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                  • parksr5

                    parksr5 New Member

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                    I have no issue with anyone liking Japanese cars, or any car for that matter. Do what you do, who cares what others think, do what makes you happy. Same thing with parts purchases. I try to buy American when I can but, have bought non-American parts too. I bet at some point, I will own some Stealth heads. I was the guy who sunk money into iron heads though too, have a set of cnc ported 906's. Again, buy what you want and who cares what others say.

                    I just found it comical that there was a strong opinion voiced to support American products, etc. and come to find out, the guy was rocking a non-American car. Again, no hate on what car one chooses to build, etc. The rotary engines are rather impressive to me, some make a lot of power. Not my thing but, to each their own. I can still look at a car and appreciate craftsmanship, etc., even if it's not my thing.

                    My Mopar is a 69 Road Runner. Bench seat, column shift car; nothing special. Have all the numbers matching parts but, have been running a 470 for the past 10 or so years. Just a nice driver car.

                    Have a few Mustangs and some square body Chevy's too. I like a lot of different cars.
                     
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                    • Righty Tighty

                      Righty Tighty FABO Gold Member FABO Gold Member

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                      Since we're mincing words, can you explain why you think "summation" has a negative connotation?
                       
                    • MOPARMAGA

                      MOPARMAGA FABO Gold Member FABO Gold Member

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                      On your avatar are you on mt lemon ?
                       
                    • Righty Tighty

                      Righty Tighty FABO Gold Member FABO Gold Member

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                      No sir, Chiva Falls. Are you familiar with the area?
                       
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                      • MOPARMAGA

                        MOPARMAGA FABO Gold Member FABO Gold Member

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                        No Not really, I visited some friends a few years ago in Tucson and we went up there, I thought the rock looked familiar lol .
                         
                      • Righty Tighty

                        Righty Tighty FABO Gold Member FABO Gold Member

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                        Chiva Falls is in the range adjacent to the one Mt.Lemmon is in, lots of granite out there.
                         
                      • 604B1duster

                        604B1duster Well-Known Member

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                        I know of a 3.75 stroke 413 with 4.233- notched bores, 270 TrickFlows, 725 HP
                         
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                        • thesiren74

                          thesiren74 Well-Known Member

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                          If I ever rebuild this it's going 4.250 and maybe trickflow heads.
                           
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                          • 72Duster440

                            72Duster440 Well-Known Member

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                            I'm sure it's been posted in one of the 200+ replies above, but I didn't see it with a quick scan. Engine masters did a BBM cylinder head shootout.
                            The 440 Source heads made ~15 hp more than stock 516's, or maybe 906 head?
                            The Edelbrock made ~15hp more than the 440 source
                            and the Trick flows made ~15hp more than the Edelbrocks.
                             
                            Last edited: Jun 14, 2022
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                            • MopaR&D

                              MopaR&D Nerd Member

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                              I saw that episode, very informative and basically confirms what most of us already know. Stealths are an affordable aluminum copy of iron heads with some slight improvements, nothing more nothing less.
                               
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                              • fishmens67

                                fishmens67 FABO Gold Member FABO Gold Member

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                                You've got to be kidding.
                                A stock 516 isn't in the same universe as a Stealth head.
                                 
                              • LocuMob

                                LocuMob Fluid Technician

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                                It was a 906 head.
                                 
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                                • IQ52

                                  IQ52 Well-Known Member

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                                  And every test is different depending upon the build of the engine. I think Dwayne already mentioned the same earlier.

                                  I did a test on a 7.9:1 compression 440 where I swapped stock 906 heads for a set of ported 516 heads that flowed 250 cfm @ .500" lift. The engine went from 450 LB-FT and 387 HP to 473 LB-FT and 449 HP.

                                  A test by someone else has nothing to do with the results you may see. Engine builders with exactly the same parts will get different results from each other.

                                  In our shop if we only saw a 15 HP increase from a stock 906 head to Stealth heads we had a major screw up with the engine some where.
                                   
                                  Last edited: Jun 14, 2022
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                                  • Hallzy

                                    Hallzy Well-Known Member

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                                    I'm skeptical of the validity of this information as well. If the Source heads only produced 15 more..the eddys 15 more again and then a cnc ported trick flow only 45 more than stock must be the crappiest cnc job in history thats pretty expensive hp in my opinion. Not exactly a good sales pitch for Trick flow either.
                                     
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                                    • LocuMob

                                      LocuMob Fluid Technician

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                                      Here's the numbers they came up with. 906 was run on a previous day.

                                      PXL_20220614_184808920.jpg
                                       
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                                      • PRH

                                        PRH Well-Known Member

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                                        906 heads = $350

                                        That’s just a fantasy.
                                         
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                                        • MopaR&D

                                          MopaR&D Nerd Member

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                                          It was a pretty mild cam and short block they tested on iirc, I mean 450-500 HP is not much from a 440 these days. I think they mentioned this in the episode, if they were using a bigger cam and more compression there would have been more gains with the "bigger" heads.

                                          I think it's a useful takeaway that better-flowing heads alone won't do a whole lot for power if the rest of the combo doesn't take full advantage of the flow.
                                           
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