[67 455 Bird ragtop]

Ok here is a little visual for ya. The first pic is the stock L2359. The second is piston #1. The last is the problem child #5. The purple is the factory stamping. The orange is either the factory arrow or where it should be and pointing to the front of the engine. The green is the factory valve relief. And the red is the new expanded valve relief. So you can see if I flip #5 and put it in the proper orientation the new relief is useless. And leaving it alone is no good because like Half-inch said I don't want metallic gravy for oil. But it's looking more and more like these reliefs were actually necessary. Was given some bad advice many years ago. So in the next few days I'll flip the piston and reinstall it and check the clearance. If it works it works. If it doesn't so be it and I'll move on to another option.