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I did not know that.

This probably sounds stupid, but should the open part of the plug be pointing straight up towards the top of the c.c. or straight down towards the top of the piston?

Mine...

make a mark on it?
with what?

other side

forgot this

This is a pic of one of my plugs. I haven't been driving the car, just running it on jack stands through my drivetrain and everything. I don't just let it sit and idle the whole time, I usually...