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Larger valve options for 3900?

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  • Larger valve options for 3900?

    Now that I got it tore down...I was thinking, could I use 6.0L lsx valves? 2" intake 1.55" exhaust. I'm assuming they're both 8mm stems, not sure on the length but I could pick up the valves cheap from a local pickn'save...and thoughts or info on the subject?

  • #2
    Someone else put larger valves in and it didnt gain too much flow from what I remember. 20 com? Maybe? There was a thread on it

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    • #3
      Originally posted by bigcheese View Post
      Someone else put larger valves in and it didnt gain too much flow from what I remember. 20 com? Maybe? There was a thread on it
      I've heard they don't respond great to porting, I know GM did the same thing with the old vortec 350 heads...very good design out of the box...if they flow another 20 cfm, it would be worth it. Probably 30ish horsepower. I'll look around for that thread
      Last edited by trash boat; 10-29-2017, 10:06 PM.

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      • #4
        Mrtohil I believe started the thread

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        • #5
          Originally posted by bigcheese View Post
          Mrtohil I believe started the thread
          Yeah sir, pretty good thread http://www.60degreev6.com/vb5/forum/...ormance/page15

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