049 heads
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049 heads

  1. #1
    Cole SS cole ss's Avatar
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    Default 049 heads

    I am getting ready to install larger valves in my heads with a mild port job. Should I install hardened valve seats? What do most people do? Thanks

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    New here Beer:30's Avatar
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    Quote Originally Posted by cole ss View Post
    I am getting ready to install larger valves in my heads with a mild port job. Should I install hardened valve seats? What do most people do? Thanks
    What fuel are you going to run? Leaded race fuel or LL (low lead) AV gas will not require hard-seats. UNleaded fuels require hard seats.

    I don't know that any machine shops will let heads out of their building without hard seats anymore. Older heads, that is. New heads have "adjusted" metal/alloy content to handle unleaded fuels right from the start. Although new aluminums are a different story. Gotta have seats in those, obviously.
    Quote Originally Posted by gn7 View Post
    EFI is the wave of the future. There can be no denying it. Electronics have been on the leading edge of our entire lives. Not only os the magneto dead, but the standard issue CDI is wavering. Its all about total fuel, air AND spark control. Anybody that thinks its not has their head up their ass.


    2001 SleekCraft 30' Heritage SSB, open-bow mid-cuddy. 496HO / Bravo-I.

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    AKA Blownjet 468 Blowncat 509's Avatar
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    depends what year 049's they are if I remember correctly, later ones had
    the seat area's induction hardened I believe. boat applications aren't like
    car app's either, even without hard seat inserts, your not looking for 100,000 miles of service! never really seen any problems doing this, and I
    have done it quite a few times! pulled 'em off couple seasons later, no
    noticable seat recession, or anything seat related, for that matter. 1 thing
    you should do though, is make sure you unshroud the chamber for the
    exaust valve, better yet, ask steelcomp, understand he's the 049 guru!

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    steelcomp was here
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    Quote Originally Posted by Blownjet 468 View Post
    depends what year 049's they are if I remember correctly, later ones had
    the seat area's induction hardened I believe. boat applications aren't like
    car app's either, even without hard seat inserts, your not looking for 100,000 miles of service! never really seen any problems doing this, and I
    have done it quite a few times! pulled 'em off couple seasons later, no
    noticable seat recession, or anything seat related, for that matter. 1 thing
    you should do though, is make sure you unshroud the chamber for the
    exaust valve, better yet, ask steelcomp, understand he's the 049 guru!
    Hardly the guru...but I do have a large oval port upgraded head that I offer and hardened seats are an option, but for these marine apps I don't consider them mandatory. If you're installing oversized valves, you'll machine out any factory induction hardening. Like mentioned above, most marine deals see relatively few hours and if you make sure to have good valve springs, it shouldn't be an issue.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Senior Member VDRIVERACING's Avatar
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    Quote Originally Posted by steelcomp View Post
    Hardly the guru...but I do have a large oval port upgraded head that I offer and hardened seats are an option, but for these marine apps I don't consider them mandatory. If you're installing oversized valves, you'll machine out any factory induction hardening. Like mentioned above, most marine deals see relatively few hours and if you make sure to have good valve springs, it shouldn't be an issue.
    x2

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    Quote Originally Posted by cole ss View Post
    I am getting ready to install larger valves in my heads with a mild port job. Should I install hardened valve seats? What do most people do? Thanks
    You don't need hardened seats in a 049 head. I saw a 454 last night make 626 hp/612tq with a Isky flat tappet, 10.4 comp with a set of ported 781s!!

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