GSC P-D BMW E36 M3 Manganese Bronze Exhaust Valve Guide Stopper Style +.003in Oversize OD - Single

GSC Power Division is known for making solid performance engine components. This particular part is a Manganese Bronze Exhaust Valve Guide Stopper, designed to be +.003 inches oversize. It's a single piece, meaning you'll need to order one for each valve you're working on.

Manganese bronze is a good material choice for valve guides because it offers decent wear resistance and lubricity, which is important for keeping things moving smoothly in the high-heat environment of an engine's exhaust port. The fact that it's an oversize part means it's intended for engines that have had their valve guide bores opened up, likely during a rebuild or performance modification where the original guides have worn out or need to be replaced with a larger size for improved sealing or durability.