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Thread: 4age big port cams in a small port head/

  1. #16
    Junior Member Automotive Encyclopaedia
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    Default Re: 4age big port cams in a small port head/

    only person i know to have dynoed before and after ont he same dyno lost a couple of hp

    that could be dure to temps etc though

    its not worth it unless you already have it apart

  2. #17
    Gary Motorsport Inc. Too Much Toyota takai's Avatar
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    Default Re: 4age big port cams in a small port head/

    Mine gained like 7hp on the same dyno, albeit i was getting 1.5psi more the second time around
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  3. #18
    Fuel Economy Warrior Carport Converter Vios-GT_07's Avatar
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    Default Re: 4age big port cams in a small port head/

    Quote Originally Posted by Mr Revhead
    only person i know to have dynoed before and after ont he same dyno lost a couple of hp

    that could be dure to temps etc though

    its not worth it unless you already have it apart
    yea was told that there would be HP loss from doing this.. not sure about torque.. can anyone confirm that using bigport cams in a smallport engine is pointless and causes power loss?
    Research has shown child in front seat causes accidents, accident in back seat causes child

  4. #19
    working hard Backyard Mechanic
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    Default Re: 4age big port cams in a small port head/

    works well on 4agte motors , kicks in harder and pulls all the way to redline harder recommed it to any one for cheap power upgrade

  5. #20
    Junior Member Backyard Mechanic pete05's Avatar
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    Default Re: 4age big port cams in a small port head/

    these are the cams im now looking at.

    CT271/272

    411A
    Slight lope at idle, good mid range power, suitable for std or slightly modified engines.

    RPM RANGE 3000-6500
    ANY
    cam timing 25-65 65-25
    advertised duration 270° 270°
    [email protected]" 220° 220°
    valve lift ×312² ×312²
    lobe seperation 110°
    running clearance ×010² ×012²


    any opinions, i want to run these with the factory ecu.

  6. #21
    Junior Member Automotive Encyclopaedia
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    Default Re: 4age big port cams in a small port head/

    Quote Originally Posted by takai
    Mine gained like 7hp on the same dyno, albeit i was getting 1.5psi more the second time around
    should have mention this was an N/A engine

  7. #22
    Gary Motorsport Inc. Too Much Toyota takai's Avatar
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    Default Re: 4age big port cams in a small port head/

    Yeah, the GZE probably woudl have liked the bees dick extra lift.
    -Chris | Garage takai - Breaking cars since 1998
    Sparky - AE86 IPRA Racer | RZN149 Hilux - Parts and Car Hauler
    I never saw a wild thing sorry for itself. A small bird will drop frozen dead from a bough without ever having felt sorry for itself. - D.H.Lawrence

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