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I've only done it 3 times and I don't have a picture of just the piston to show what it looks like. It's not a full dome, just a little off the edge on each side of the exhaust port.

I cheated and got both flat and arched

I just checked my notes. I'd try 75 on the intake, and 101 on the exhaust.

From what I remember they have good stock numbers, so stay conservative: just a healthy muffler mod, lower the intake to around 72 or 74. Dont widen the ports further than 33-34mm, though they may already be a smidge wider than that. Raising the exhaust and lowering the intake makes peak power...