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I asked this very same question to JE directly this week. The response I got was:
"We make a round dome as we don't know
what the end customer will be doing with the piston.
We can and do make a slant dome on request .....Some engine builders request this type of dome on a
engine with single plug ignition. The idea is that the slant on the side
of the dome will push the fuel/air mix toward the spark plug. We can
make a custom piston for anyone that wants this. The custom pistons cost
a little more than our catalog parts."
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