you might be getting piston slap)caused by piston too loose in cylinder) or the piston might be hiting the head (caused by the base or head gasket too thin or the head is not machined properly and tapping the head at the edge of the heads machined sealing ring)
I don't think you will hear preignition knock form these engines. I set the base gasket too thin on an engine and it will make a very strange sound when the piston taps the head and it will tap only when wound out.
burning anything but regular gas is a waste of your hard earned money in these engines.

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