My dad seems to think that the engine has been taken apart before. It's either that or Mazda never put it together properly. Some of the cam cap bolts were tight, others quite loose. Some of the head bolts were ultra, ultra tight, others rather easy to get out. One of the cam caps was on backwards too. It doesn't affect it but you can see all the numbers faced one way and this one cap was around backwards.
My dad says the engine looks honed recently. Not sure if it is. He cleaned up one of the pistons and you can see it does look quite good. Not sure what to make of all this. They seem high compression ones so I wouldn't think they are aftermarket or new. This is only on the rear head so far (pistons 1 - 3 - 5).
How can I tell if the pistons are standard size when I take them out? Will there be any markings? It just says 21 on it.
![Image](http://users.adam.com.au/kakarot/rebuild/engineout.jpg)
![Image](http://users.adam.com.au/kakarot/rebuild/engine.jpg)
![Image](http://users.adam.com.au/kakarot/rebuild/engine2.jpg)
![Image](http://users.adam.com.au/kakarot/rebuild/bvc.jpg)
![Image](http://users.adam.com.au/kakarot/rebuild/fvc.jpg)
![Image](http://users.adam.com.au/kakarot/rebuild/rpistons.jpg)
![Image](http://users.adam.com.au/kakarot/rebuild/mpiston.jpg)
![Image](http://users.adam.com.au/kakarot/rebuild/hone.jpg)