Interesting.
Even though the flat head arrangement is different....I still don't know how the lead would lubricate the guides.
It pulls aif fuel past the guides...not through them.
After they went to positive seals....guides wore more quickly. Some consumption past the guides is necessary.
Unleaded gas will damage seats however.
Hmmm....Interesting.
Wonder how it was supposed to lubricate the guides?
I just assumed that it left deposits on the valve stem which served as a lubricant between the stem and the guides. But it's something I read long ago. I don't recall the particulars about it.
From what I'm reading now it seems that lead is more beneficial to the valve seat than the guide.
