[Formulajones]

I've had stock seats in mine for the last 25 years back when I built the engine. I tore it down about 5 years ago with over 70,000 miles and everything was perfect. I do run a pinch of 2 cycle oil in the gas for a little lubricity. Been doing that for going on 30 years now in various cars. Don't know if that contributes to longevity but it certainly doesn't hurt, but it does absolutely help to keep things clean. I'm not a fan of todays fuels but it's what we have.
Worth mentioning I've always had flat tappet cams in this engine and nothing more than 130 lbs. on the seat. Of course results will vary depending on several variables. Everything else here aside from the bug has hardened seats in it.