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  1. #1
    EZ Dock of Long Island Shibby1485's Avatar
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    Anyone have stock installed height or seat pressure specs?

    the 4-tec engine manual gives me pretty much every spec except for seat pressure and installed height.... if anyone has this information please let me know, thank you.


  2. #2
    race jase's Avatar
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    stock seat presures are 40 lbs not sure about heights

  3. #3

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    If you run it up to 100lbs it will break rocker arms. I thought stock was around 60lbs.

  4. #4
    race jase's Avatar
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    if you want to run 100lbs you need to replace the ex valves with one piece valves or you will break a valve head, i found that out more than once i havent heard of rocker arms breaking before
    stock seat pressure is 40 lbs

  5. #5
    HORSEPOWER JUNKIE 9secZO6's Avatar
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    Quote Originally Posted by race jase View Post
    if you want to run 100lbs you need to replace the ex valves with one piece valves or you will break a valve head, i found that out more than once i havent heard of rocker arms breaking before
    stock seat pressure is 40 lbs
    The rockers are cast aluminum and I broke 1 at the roller, where the pin securing the roller goes in. I too worry about these valves, as far as the head and stem staying together w/ increased spring pressure. Mo money Mo money.....1 of those things that can keep u awake at night. I need to look around and see if I still have an old LT1 piston here.....the valve head is embedded into the top of piston and the block and head on that side were toast. Solid roller w/ high spring pressure on stock GM sodium-filled valve= really bad day

  6. #6
    race jase's Avatar
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    the inlett valves are fine they are a 1 piece valve but the exhaust valves are shit they have ruined a few engines

  7. #7
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by race jase View Post
    the exhaust valves are shit they have ruined a few engines

    I agree and that reminds me, i have stock lightened valves (even weaker than stock) in one of my heads that i'm going to replace with these.

    The best valves money can buy
    http://www.4-tecperformance.com/inde...roducts_id=527

  8. #8
    EZ Dock of Long Island Shibby1485's Avatar
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    so if i'm doing a valve job on my head and cutting the seats, what do i want seat pressure to be with stock valves? i'm not getting different valves on this head.

  9. #9
    race jase's Avatar
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    shibby
    why not stay with stock seat presure(40lbs)if you arnt doing any mods!

    jerry i to have lightend stock valves in my turbo ski and worry about these things, do you know the weight of the lightend valves you sell compared to lightend stock valves?

  10. #10
    EZ Dock of Long Island Shibby1485's Avatar
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    Quote Originally Posted by race jase View Post
    shibby
    why not stay with stock seat presure(40lbs)if you arnt doing any mods!

    oh, there's PLENTY of mods, but i ain't droppin $750 for valves and $600 for springs, i'm not that nuts. I'd sadly rather see my motor blow up again

    i dont race on a course and put my ski thru the same type of abuse... there's far too many rec skis with plenty of mods that have had stock heads last 200+ hours...with 8600 and higher boost.... REC. hours, not bouy course hours

    i just was trying to clear the discrepancy of what stock seat pressure actually was since i've been told a few varying specs.

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