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

  1. #1
    Junior Member Backyard Mechanic pete05's Avatar
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    Default 4age big port cams in a small port head/

    Can this be done? has anyone tried it as a cheap cam upgrade. If it can be done would they make much difference?

    Edit: found they fit but do they make any difference?

    thanks
    Pete
    Last edited by pete05; 15-05-2008 at 11:45 PM.

  2. #2
    Junior Member Too Much Toyota oldcorollas's Avatar
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    Default Re: 4age big port cams in a small port head/

    small difference in duration and maybe lift?
    if you have them for free.. why not? (and have shims/don7t need them)

    then again, some cheap 256 or 264 will work better
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    Junior Member Backyard Mechanic pete05's Avatar
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    Default Re: 4age big port cams in a small port head/

    I like how you say cheap 256 or 264! i guess i will have to keep an eye out for some.

    cheers

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    Toymods Board Member Chief Engine Builder Hiro's Avatar
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    Default Re: 4age big port cams in a small port head/

    Yes it can be done, as been discussed quite regularly on Twincam.org.

    Here are a few threads regarding it:

    How to tell the difference between bigport and smallport cams

    Toyota's cross model swapable parts
    Bigport cams into smallport

    Hope that sheds some light
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    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, works perfectly. I only did mine as i was pulling the head apart for a bit of work on the GZE. Didnt really notice any difference.
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    Junior Member 1st year Apprentice Grippy's Avatar
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    Default Re: 4age big port cams in a small port head/

    I did mine, no real difference, runs a littel smoother and thats about it.

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    Junior Member Grease Monkey
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    Default Re: 4age big port cams in a small port head/

    i found there to be a bit extra in the midrange, but i also only replaced them while the head was off. but if your keen to rip it apart any extra is a bonus

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

    yeah head has to come off for a BHG thats why im asking. did a compression test and got 225 in 3 cylinders and 200 in the one where the gasket is blown

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    Insert whitty comment her Automotive Encyclopaedia blacktop's Avatar
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    Default Re: 4age big port cams in a small port head/

    Why not just get your existing cams Reground? cost more than bigport cams but you will get alot more bang for your buck with a regrind

  10. #10
    Junior Member 1st year Apprentice Grippy's Avatar
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    Default Re: 4age big port cams in a small port head/

    Quote Originally Posted by blacktopspirit
    Why not just get your existing cams Reground? cost more than bigport cams but you will get alot more bang for your buck with a regrind
    Where and how much does this cost??/

  11. #11
    Junior Member Grease Monkey
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    Default Re: 4age big port cams in a small port head/

    the one local to me said $20-25 a lobe and another $60 to set shims if i had the head with me. Your mileage may vary

    i just hit the yellow pages and looked up camshaft grinders.
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    Insert whitty comment her Automotive Encyclopaedia blacktop's Avatar
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    Default Re: 4age big port cams in a small port head/

    Quote Originally Posted by sikmr2
    Where and how much does this cost??/


    Clive Cams Ferntree Gully Victoria, $80 a cam last time i went there about a year ago.

  13. #13
    Toyotard Conversion King Cuts's Avatar
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    Default Re: 4age big port cams in a small port head/

    just as a matter of interest. How is regrinding cams done?
    i see two possible ways:
    1: weld the cam lobe, prob around the point of higest lift, then cyl grind. back so it all intersects smooth.

    2: the other way i can think of is to grind off say the back half (ie when it doesnt touch the bucket or rocker or however its actuated) then put in thicker shims or adjust the rocker closer to the cam. effectivly giving the same ramp rates and everything but with more lift.
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    Toymods Events Secretary Too Much Toyota trdee's Avatar
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    Default Re: 4age big port cams in a small port head/

    afaik most people do number 2.
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    Gary Motorsport Inc. Too Much Toyota takai's Avatar
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    Default Re: 4age big port cams in a small port head/

    Method 2 is called reducing the base circle. Its the normal method im led to believe.
    That said, 4A billets dont cost THAT much. IMHO if you are going to do it, do it properly.
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