OEM style valves - SBI vs Melling

@pittsburghracer comes to mind, too. But in the world of replacement valves, I like what I've seen in several different melling stainless valves I've purchased from eBay. I've not seen nearly as many SBI valves that I thought would be viable for a performance upgrade. Well, as much as a 3/8 stem exhaust valve would be for an upgrade, but good for a moderate heavy duty engine and a means to the end of eliminating the exhaust rotators.