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this is very hard question to answer....

I do beleive that it's not all attributed to the force exposed on the sleeves. The sleeves are floating which do have more play than a solid deck and could shift on high rpm.. of course if any ammount of detonation when reving a motor so high doesn't help as well...

it's not only one factor, it's multiple factors... people were knocking B20 sleeves in cracking, but it was the tunning that was causing to many detonations up top... others have never seen a problem. Yet it's the same blocks....

don't forget coating takes up tolerances.. so you might have to hone a thou or so if you add a coating on your pistons. Also the fact that cast peices will expand and contract faster than a forged unit because of the alloy in the casting process, the piston batch can also have more sil or less.. which can also affect the tolerances of the piston... it's like welding a cast manifold, you can take two manifolds and weld on each, although they are both honda manifolds, not all contain the same alloy. resulting in different processes.... however FORGED cut pistons are almost perfect, yet still have slight alloy diferences in the forging process but too little to calculate and put a reason on it... if you notice, not all piston manufacturers use the same alumium forging alloys. So without consistency testing... I guess time will tell until products are tested.

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