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possible or not, i recently bought a Hyundai Excel GS and to keep it going until i can pick up a 4g63t swap i need to replace 2 pistons. I found 4 flat top mirage pistons from a 12v not realising that my hyundai had pistons that were not flat. will i have head interference? or will it just be a little more compression and be fine. DOES ANYONE KNOW?

i have searched and cannot find a direct answer, just need to know before i end up costing myself a great deal of money.

As the owner of the board, and I've been here since forever, I have never heard of this. I think you are on your own for this one(sorry). Maybe there is someone who knows how engine dimensions work who might be able to help you? I just know that the 8v is less susceptible to timing belt casualties, and if they haven't had there heads planed they should survive a timing belt snap. The 12 valves are definitively interference. I would think it would work if your timing is spot on. You could just assemble it and hand turn it to try it out. I hope I'm helping shed some light about your situation, not exactly a direct answer you were expecting though . You could also pick up an 8v engine in the junkers for less than 200, or you might find an ecu/body crash casualty excel/CSM on craigs list for cheap. Your options to weigh sir.

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appreciate the help, installing the head today and we will see what happens. should be quite the compression change.

it works! has a lot of compression, will give numbers as soon as i do a compression check. Im in break in at the moment, so ill be taking it easy for the next couple weeks. will post updates as they come.

yes please do tell on the compression. this may lead onto a high compression engine build...which could be very interesting.