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This is a logical decision I made because the Hi Temp RTV was not available back when Hank designed the flathead. AND, that's a big and, from 32 to 48 Ford never used any seals. Now what you should be concerned with is the valve stem ti guide clearance. THIS, is where the oil is pulled under hi vacuum. I Knurl the guides and ream them for a .0005/.001 fit. The knurel will keep the guide well lubricated. AND yes Knurel the new guides you bought and ream them as well. I've done this to every engine I've build over the past 30 years.