Head porting with oversize valves-cost?

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  1. #1
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    Head porting with oversize valves-cost?

    I'm in the process of having my motor fully built. Everything for my block is already ordered and being rebuilt. But I can't make up my mind what I want to do with my head. I want it ported, polished and rebuilt. But I can't make up my mind if I want to go with oversize valves. I was quoted a price of $1250 for a fully rebuilt head with porting, polishing, multiangle valve job, bowl work, flow tested and a few other things. My question is how much added expense is using oversized valves, and is it worth it? What kind of prices have you all paid-if you don't mind me asking? Thanks..
    -92 supra turbo
    Built 7M/6262 495rwhp pump gas
    2011 Mustang GT
    399rwhp-ready for boost

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  3. #2
    I Love Lamp... selz202's Avatar
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    What horsepower are you going for? Id say if you're at 500 and you added a 1 over valve it'll add an extra 20-30.

    I know Duane mentioned his motor probably gained alot more.

    Alot of quotes i got from the machine shops varied alot... it almost seemed as if they had no clue and just pulled the prices out of thin air. Anywhere from an extra $200 to an extra $900. With 24 valves i would expect to pay around $15-$20 each, but you may find even cheaper.

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    My goal is low to mid 600rwhp on a 67mm turbo, enough to get me a 10 second 1/4 mile time. I'm sure I can reach those goals on a stock head, but I figure with better breathing, I can do it easier with less boost.

    I plan on getting the BC 264 cams (if they ever come in) to compliment the head work.

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    JZA70 448 rwhp everyday scottiedawg66's Avatar
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    head work depends alot on the shop. When i was lookin to get a built head I was quoted $3000 for a totally built ported polished head. bronze valve guides, 5 angle job, port polish, port match, +1mm ferra valves, re surfaced, valve stems, valve springs, and i had to supply cams.

    ~scott

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    Thanks for the info Scottiedawg. I'm just trying to get an idea.

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    tire killer need new tires's Avatar
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    if you do the porting yourself and have the machine work done on a flat head it will be around $600.

    285 for the 1mm valves
    60 for the comp springs
    187.50 for the vavle job(what i was quoted this week)

    anything else is going to change the price but that should give you a ball park number.

    -shane

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    SupraForums Member newbsupra's Avatar
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    Is something like this worth getting done on a stock 7mgte? Or? My goal is 300rwhp.. And my head is off right now.

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    JZA70 448 rwhp everyday scottiedawg66's Avatar
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    no, you can spend the money elsewhere and net more power per dollar.

    ~scott

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    JZA70 448 rwhp everyday scottiedawg66's Avatar
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    Quote Originally Posted by MRSUPRA View Post
    What kind of prices have you all paid-if you don't mind me asking? Thanks..


    "More than u can afford pal"

    ~scott

    WTB: aristo harness
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    WTB: excellent condition 91 or 92 silver on shadow grey targa. Auto and non turbo is ok.

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    SupraForums Member gilberjj's Avatar
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    Quote Originally Posted by scottiedawg66 View Post


    "More than u can afford pal"

    ~scott
    wow... priceless

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    Listen, I'm very serious about this. Enough of the Fast and the Furious talk.... The reason I need this head work advise, is because I live my life a 1/4 mile at a time, for those 10 seconds or less, I'm free.

  13. #12
    JZA70 448 rwhp everyday scottiedawg66's Avatar
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    waaaahahaahahahaha awesome response! Ive got some overnight parts from japan that would make that 2jzge decimate all.

    ~scott

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    1mm oversized valves can use the stock seats, maybee even 1.5 os... but any bigger than that and your looking at spending 20 per valve seat... big money

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    I'm no head expert, but doesn't that defeat the purpose of using oversize valves if you are going to keep the stock size seats?

  16. #15
    Grumpy Old Man
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    Stock seats but they open up the throat to suit the 1mm os valve.

    Any larger than 1mm and you start shrouding the valves and this hurts flow, even at 1mm you really need to work the combustion chambers to suit.

    LMAO @ the FnF refs!

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    I see. Thanks..

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