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Brian Crower VALVE GUIDES 6.0mm EXHAUST Toyota Supra MK4 2JZ (BCR BC3931) peugeot-408-1st-gen 2007 AUDI TT 1Brian Crower VALVE GUIDES 6. 0mm EXHAUST Toyota Supra MK4 2JZGTE 2JZGE 2JZ Brand: Brian Crower Manufacturer's Part Number: BC3931 Stealth Ride Part Number: BC3931 UPC: Description: Valve Guides are a wear item. They wear over time and eventually should be replaced. The higher you rev, and the harder you push your engine, the more important tolerances become. If you are spending the time and money to upgrade your valvetrain, be sure your tolerances are