No Bronze Guides, Any Reason?

I know it's hard to believe but there was a time when fancy bronze guides were not even invented. Yet we still raced. Huh... how could that be?

I've had one set on J heads done with bronze guides. Every other engine has had factory iron guides... street or race.

Bronze work good to keep the valves from sticking to the iron when they get hot. One of my engine guys doesn't use umbrella seals on the exhaust... maybe an old school Chevy stem seal. Or none at all without any issues on race motors.

My W2 heads were done in '93 with iron guides. I'll stick with them until I get them redone next time...then I may make a change. May is the key word. I'll likely remove the exhaust seals, too.