GSC Subaru FA20/BRZ +.003in Oversize Stopper Exhaust Valve Guide - Single

This is a single exhaust valve guide from GSC Power Division, specifically made to be .003 inches larger than stock. This slight oversize is crucial when you're rebuilding or repairing the cylinder heads on your Subaru FA20 engine, commonly found in BRZ models. When valve guides wear out, they can cause oil to leak past the valve stem and into the combustion chamber, leading to blue smoke and increased oil consumption.

Using a precisely sized replacement like this .003in oversize guide helps restore proper valve stem-to-guide clearance. This is important for maintaining good compression, preventing oil burning, and ensuring the valve can seat correctly. GSC Power Division is known for making well-built engine components, and this valve guide is no exception, offering a solid option for engine builders looking to get their FA20 back in top shape.