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Thread: What exactly is a 3-angle valve job?

  1. #1
    Royalty's Avatar
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    What exactly is a 3-angle valve job?

    Ive heard it used time and time again. but what is it exaclty, why do i need it and what does it do for my car?

    thanks
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  2. #2
    HatefulMechanic is offline The Pro to call.
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    Re: What exactly is a 3-angle valve job?

    three angles on the seat instead of the standard 1. better flow of air of course, due to the smoother air transition.


    not gonna do much on a street car, unless other things are done to improve airflow also.
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  3. #3
    Royalty's Avatar
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    Re: What exactly is a 3-angle valve job?

    it was included wiht my new head, i was jsut w ondering wht it was gonna do for me

  4. #4
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    Re: What exactly is a 3-angle valve job?

    generally they're gonna need to do a valve job anyway to make sure that each individual valve sits right in its own little port... and since they're doing it anyway, mi'se well do 3 angles.

  5. #5
    HatefulMechanic is offline The Pro to call.
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    Re: What exactly is a 3-angle valve job?

    Quote Originally Posted by steronz
    generally they're gonna need to do a valve job anyway to make sure that each individual valve sits right in its own little port... and since they're doing it anyway, mi'se well do 3 angles.


    its not quite that simple....but yes, most heads do benefit from it. a five angle is a BITCH to do, but a three angle one isnt too bad. adds a decent amount more time though.

  6. #6
    Corey's Avatar
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    Re: What exactly is a 3-angle valve job?

    I know three angle was the standard vavle job we did when I worked at a machine shop.
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    SloUSDM22 is offline Banned
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    Re: What exactly is a 3-angle valve job?

    you learn new stuff everyday. anyone attending TCC for auto mechanics?

  8. #8
    eng's Avatar
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    Re: What exactly is a 3-angle valve job?

    Maybe this picture will help describe it some? The top angle is 30, the blue angle is 45 and the bottom is 60.

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  9. #9
    HatefulMechanic is offline The Pro to call.
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    Re: What exactly is a 3-angle valve job?

    Quote Originally Posted by greygti
    I know three angle was the standard vavle job we did when I worked at a machine shop.

    what kind of head? was this a performance shop?

  10. #10
    ToyotaTechGeek is offline brake/steer/throttle
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    Re: What exactly is a 3-angle valve job?

    i know with 5 angles, on the dyno there is a slight, but noticeable difference found in the lower end. three angles is pretty standard unless you decide to lap the valves 'in' instead. the 3 angles helps to recondition the seats before hand lapping. just makes for good sealing and if there are pits in the valve seats, they will be removed or is a 'nice' discovery in order to do something about it while the head is off.
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    Re: What exactly is a 3-angle valve job?

    Quote Originally Posted by fc735
    three angles on the seat instead of the standard 1. better flow of air of course, due to the smoother air transition.


    not gonna do much on a street car, unless other things are done to improve airflow also.
    It comes stock on a factory LS1 style head, I don't know how much more street you can get than that. You are correct that the airflow dictates the use of such small details.

  12. #12
    ritz's Avatar
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    Re: What exactly is a 3-angle valve job?

    We all know LS1 heads > *

    Hell LS1's in general > *


  13. #13
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    Re: What exactly is a 3-angle valve job?

    Quote Originally Posted by fc735
    what kind of head? was this a performance shop?
    They did it on nearly all their heads. The shop was not a performance shop. The did do some performance work (porting and sleeving)

    It had been open for 80 years when I started working. Two of the machinists had been there for nearly 40 years.

  14. #14
    MGBRaceman's Avatar
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    Re: What exactly is a 3-angle valve job?

    Something interesting that I've never seen before, Z1 motorsports offers a rediculous 14 angle radius cut valve job on their stage 4 motors, here's the link... http://www.z1motorsports.com/product...products_id=58
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  15. #15
    HatefulMechanic is offline The Pro to call.
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    Re: What exactly is a 3-angle valve job?

    Quote Originally Posted by BigBake
    It comes stock on a factory LS1 style head, I don't know how much more street you can get than that. You are correct that the airflow dictates the use of such small details.

    GM started using it on production heads on the Vortech's in 94+, i figured they would use it on the LS's.

    Quote Originally Posted by greygti
    They did it on nearly all their heads. The shop was not a performance shop. The did do some performance work (porting and sleeving)

    It had been open for 80 years when I started working. Two of the machinists had been there for nearly 40 years.

    damn. my shop does a standard one angle on most unless i ask

    Quote Originally Posted by MGBRaceman
    Something interesting that I've never seen before, Z1 motorsports offers a rediculous 14 angle radius cut valve job on their stage 4 motors, here's the link... http://www.z1motorsports.com/product...products_id=58
    unless they have changed their machine shop, which i think they did when they went to their new facility, i have seen quite a few problems with their engine work. again, i think they changed though, so i might be wrong on it.

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