390 or 410
That is a good point 427. Never thought of that. Most of the pistons have dishes and then a valve relief. You could still angle the wire to angle towards the outside of the cylinder so it against the wall.
Kinda funny but the only time I have ever had stitches was from getting cut by a cheap computer case. They had to put a few threads through the fingernail. That really sucked. It does lay you up for a long time though doesn't it.