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Thread: VN heads

  1. #46
    Do you ever leave? HPE PETE's Avatar
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    we always like the best of everything on everything but like tk said there is always a budget involved to so there will always be a compromise of some sort weather it be valve train or porting engine components etc etc..

    i dont really know what all the hoo ha is all about, basicly there is nothing different here between these chambers and tk,s chambers except i have just put a buff on the die grinder with some metal polish, basiclly it goes sanding roll then emery tape, the polish takes about 2min per chamber it seems as soon as you put a shine on something everbody has something to say about it, the last pic before the shiny port is how we finish all our chambers and smoothing them is a part of shaping as well, if you checked surface finish between this and the shiny one it would be nearly exactly the same, i do it on heads that have large curves and radius's and honestly the buff just fits in to the shapes so easy i cant help myself.

    VN head different story the corners of the chambers are sharper and its harder to get in to those corners and takes more time thats why you will rarely see me do it unless i am asked to do it, but i would have said your chambers are polished as well tony, if you take the photo with the flash turned off you will see how shiny it looks pretty much the same as the iron heads i have pics of here, if a chamber is easy to polish and doesnt much take time i will do it.

    alloy heads with nice radius are easy anything squarish takes time
    Last edited by HPE PETE; 02-04-2012 at 11:41 AM.

  2. #47
    Do you ever leave? cava454's Avatar
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    Out of curiosity what would a set of top fueler heads flow.

    Also is given the option and unlimited budget what would your ultimate head choice and flow figures be.

    Is there a head that would go 500cmf etc...

  3. #48
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    Yeah, I know!
    Camera is too shitty to get a good pic of the chambers without flash, either that or I'm to shitty a photographer!

    The difference in performance between sanded finish & polished = zero, but polished does look nice & customers do love it!

    I do most of the chambers with a 1" flap wheel, then the tight bits with a roll, makes getting the chambers real nice dead easy - I don't like polishing coz you have to use a fairly large mop to do it & invariably end up polishing the seats themselves & having to re-cut them. My seats are done other than a final dust with a stone before I pick up a grinder, I hate going back & recutting seats after porting, then reblending them again, so anything that stands a good chance of hurting a seat more than a 2 second dust with a stone can't fix I tend to shy away from.

  4. #49
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    cava - I wouldn't have an 'ideal' cfm figure in mind, I'd have an ideal port size, shape, taper, bowl width etc etc etc in mind & whatever that port flowed would be what I'd want!

    I do SFA flow testing, more often than not on heads I'm familiar with I'll only flow them once they are all done & ready for final assembly - & even then only coz most customers will want the numbers.
    On stuff I don't know well I will spend some time back & forthing to the bench to find the shaping & seat angles that'll make it happy, but even then it's a rare occasion that I'll have to chase it. Annoying when you gotta chase your tail on a port.
    Lately only LS stuff has made me think twice (or 3 times) - they are a PITA to get right, but got it sussed now.

  5. #50
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    on a 550hp na combo am i better off going dash 9s or can it be done with a set of vt heads? cause thats what i have but if at the end of the day the alloys are only costing me an extra $1200 bare then am i better off since ill be using all new good parts in either of the heads plus future room for further porting etc.
    Last edited by vnv8dude; 02-04-2012 at 02:52 PM. Reason: spelling

  6. #51
    Do you ever leave? HPE PETE's Avatar
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    i tell people the mirror finish over a sanded finish wouldnt make any measurable difference on the dyno but over time i think there are benefits in having cleaner chambers, this RB30 head i did over 6 years it ran for 3 years before a foreign object found it way down the intake smashing the valves and inserts up pretty bad then it has been sitting on my workshop floor for the last 3 years, we wiped the carbon out of the chambers with a rag with some brake clean on it.

    one of the dyno tuners we do heads for always asks for nice smooth chambers



    tony this is how i protect the seats i can grind right down to the top cut without having to touch the seats again



    Last edited by HPE PETE; 02-04-2012 at 09:20 PM.

  7. #52
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    n a 550hp na combo am i better off going dash 9s or can it be done with a set of vt heads? cause thats what i have but if at the end of the day the alloys are only costing me an extra $1200 bare then am i better off since ill be using all new good parts in either of the heads plus future room for further porting etc.
    550 is not that hard on VT iron heads.
    Dunno where you got $1200 bare for a pair of -9's, more like $1400ea including tax but not freight, $2800 a pair bare as cast with seats uncut.
    They'll cost you somewhere around $6k filled with parts, ported & assembled ready to go.
    A set of iron heads that'll get the job done will cost you a bit over 1/2 that money.

    Pete - don't wanna! (buries head in sand). Just a fine sanded finish stays pretty clean as well, depends on use & tune.

  8. #53
    Do you ever leave? paulzig's Avatar
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    $2800 a pair bare is drug money, I feel sorry for the Holden guys sometimes .. I wouldnt even consider building one these days ...

    Ford, LS1 you get parts for HALF the price especially intake and cylinder heads ..

  9. #54
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    wow how silly was i then thinking that was for a pair! ok well i can get them for 1200 ea but still just not sure if its worth it. the cam im looking to run is a roller in the 260's with about 680 lift. so if the iron heads are at there peak then i might as well bite the bullet and go all out and maybe make more then what im aiming for.
    your not wrong about being drug money building a holden is a joke. well doing it properly anyway without shortcuts

  10. #55
    Do you ever leave? paulzig's Avatar
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    You know, you can do a 347 8.2" deck windsor and put that in your Holden, and that would make me happy and its half price vs your 355 Holden LOL

  11. #56
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    Quote Originally Posted by paulzig View Post
    You know, you can do a 347 8.2" deck windsor and put that in your Holden, and that would make me happy and its half price vs your 355 Holden LOL
    Coyote

  12. #57
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    Quote Originally Posted by vnv8dude View Post
    wow how silly was i then thinking that was for a pair! ok well i can get them for 1200 ea but still just not sure if its worth it. the cam im looking to run is a roller in the 260's with about 680 lift. so if the iron heads are at there peak then i might as well bite the bullet and go all out and maybe make more then what im aiming for.
    your not wrong about being drug money building a holden is a joke. well doing it properly anyway without shortcuts
    355 or 383? don't need that much lift if going 383, dont be scared to give it high 270s@50 and 660-670 ish lift.. genuine 12:1 comp will be fine on pump gas if you follow through with the alloys.. whack the biggest valves you can in the dash 9s (mine are 2.150/1.650) made 620HP at a conservative 7200RPM on pump fuel still climbing... make sure you spend up good dollars on the bottom end etc and get those lifter bores bronze bushed

  13. #58
    Do you ever leave? paulzig's Avatar
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    If you dont have lift you need to whack more duration in it I guess ....

    270 at 50 is about what an NHRA 500 cube pro stocker has

  14. #59
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    Quote Originally Posted by sstank View Post
    355 or 383? don't need that much lift if going 383, dont be scared to give it high 270s@50 and 660-670 ish lift.. genuine 12:1 comp will be fine on pump gas if you follow through with the alloys.. whack the biggest valves you can in the dash 9s (mine are 2.150/1.650) made 620HP at a conservative 7200RPM on pump fuel still climbing... make sure you spend up good dollars on the bottom end etc and get those lifter bores bronze bushed
    355. pretty much i bought an engine which was fresh. pulled it down to chase more power and now im not using any of the parts apart from the crank which is a come cast. i originally said to my builder make this thing make 600hp but after it got pulled down he is saying 550 is pushing it. so its prob not worth aiming any higher :s

  15. #60
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    So Pete are the exhaust ports tooo big lol ???

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