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Thread: bigport smallport. What are the differences?

  1. #1
    Junior Member Backyard Mechanic benjamin's Avatar
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    Default bigport smallport. What are the differences?

    Other than having different inlet port sizing what are the differences?

    Are the exhaust ports the same?

    There's that oil drain thing on the smallport head which is not on the bigport head

    Basically I want to know if I can swap over my dizzy, cams, timing gears, valves etc from a smallport head into a bigport head.

  2. #2
    Toymods Club Member Backyard Mechanic Big T's Avatar
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    Default Re: bigport smallport. What are the differences?

    Exhaust ports are the same.
    Dizzy is a little different. The smallport one has only the single reference tooth while the bigport one has 4.
    Cams, the bigports are 240 deg, 7.5 lift, smallports are 232, 7.1
    Timing gears, buckets, shims, are also identical. I'm pretty sure the valves are also the same.

    Eddie.
    4agte finally completed. 234rwkw @ 8125rpm. Tis fun

  3. #3
    Building Corollas Chief Engine Builder Cuzzo's Avatar
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    Default Re: bigport smallport. What are the differences?

    You should try searching this. it has been covered one milllion times.

    Fine then: http://forums.toymods.org.au/

    Click on search type in s then m then a then two L's and continue untill you make words that you want to search for.
    Last edited by Cuzzo; 06-02-2006 at 10:22 PM.

  4. #4
    no need for a Domestic Engineer finney's Avatar
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    Default Re: bigport smallport. What are the differences?

    cuzzo at least point out a thread/website on the topic rather than some useless excuse not to help him out.

    http://www.billzilla.org/4agstock.htm#summary
    4AGTE SX - '4AGE' - 13.6 @ 103mph - 163fwkw @ 18psi - SOLD
    1998 JZX100 Tourer V - SOLD and now lives in radelaide
    1992 GTI - SOLD

  5. #5
    Junior Member Backyard Mechanic benjamin's Avatar
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    Default Re: bigport smallport. What are the differences?

    Quote Originally Posted by cuzzo
    You should try searching this. it has been covered one milllion times.

    Fine then: http://forums.toymods.org.au/

    Click on search type in s then m then a then two L's and continue untill you make words that you want to search for.
    thanks I never thought of searching...

    However, what I did manage to turn up (after searchin) was still unclear as to any major differences between the two which would have an effect on my ability to swap all my valves, cams, and shims etc from a SP to a BP head.

    Finney: Thanks that answered my question

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