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Thread: identifying a 4a block

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  1. #1
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    Default identifying a 4a block

    Im trying to identify a 4a engine
    had for a few years and going to put iot in until i build a proper one
    its a 3rib engine with 8 bolt crank
    but when i was giving it a clean it has the 7rib cams (7rib or small port)
    then it has the engine number in a stright line n ot offset like the others ive seen
    it also has a different casting at the back of the intake side
    the sump seems 16V type
    any help identifying it would be appreciated
    Click image for larger version. 

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  2. #2
    Veteran LittleRedSpirit's Avatar
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    Just pull the head off it and see what pistons it has? See whether someone slapped something together oddly or if its a regular 3 rib 16v bottom end. I thought bigport cams were better? Seems like an odd swap.






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    Click image for larger version. 

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    All 3 ribs ive seen look like thise. Have that casting on the intake side and have the engine number offset.
    An d dont have that f8 casting

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    The cams have definitely been swapped. so i assume most likely the whole head. So it could be a 4ac, but then it would be a 6 bolt crank. it could be a 4afe. im not sure what those blocks look like and they can come 8 bolt.

  5. #5
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    Thats real weird. On closer inspection, there are some three rib 16vs with that rounded casting on the inlet side but I cant find a shot of the engine number to confirm its linear.






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    Looks like a standard 3-rib Bigport block to me?

    For pictures of both 3 and 7 rib see post #15 here:
    http://www.ae86drivingclub.com.au/fo...question/page2
    My website: SQ Engineering - 4AGE and 3SGE upgrade/replacement parts

    - SQ Engineering on facebook -

    Please e-mail to contact me instead of sending a private message on here.

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    Yup seen that. It has the cast "bump" this engine doesn't. So it sure if it's a 4ac black or a 4afe or 4age

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    And to spice things up:

    In my AE82 I have a 3 rib block, engine number in a straight line with a 42mm crank, large gze/smallport rods with bigport pistons...

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    What size are the wrist pins? That's an unusual setup. But the block sounds like it's the same one. Is it a factory engine?

  10. #10
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    Can't remember but I'd say 20mm as I've never heard of those size rods being otherwise. First time I realised was when I rebuilt it and the big end bearings from a bigport kit didn't fit. Sure is the most bizarre 4AGE I have ever seen and I would assume that it was the last of the old 3 rib blocks as they changed over to 7 rib bigports and had no 40mm cranks left.

    edit: no idea if its the original engine or not. It will be stripped at the start of next year and I will keep the motor as a Toyota oddity.

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