they cant hurt UNLESS like ya said it comes off. you can always attach a magnet to the outside of filter
My vette didn't come with two 243 heads but it did come with a magnetic drain plug. My first oil change was at 1Kmi and I too had about a pea size amount of metal shavings on the end. I only have 1300 mi so I cannot tell you how much it helps after the motor has broken in. They are cheap so why not.I just picked up a magnetic oil drain plug from Chevy dealer. Who has used one? I hear the 07's come with it. Can anyone confirm that to be true? Any opinions on whether or not it is worth it to use? Is there any risk of the magnet popping out of the plug and causing damage?