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Restore Precise Exhaust Valve Guidance in Toyota 3S Engines
Brian Crower BC3937 exhaust valve guides are CNC-machined replacement guides for Toyota 3S-GTE and 3S-GE cylinder heads using 6.0 mm valve stems. Their manganese-silicon-aluminum-bronze alloy is designed for wear resistance, lubrication and stability at elevated engine temperatures.
Key Features
- BC3937 is made for exhaust-side valve-guide service on applicable Toyota 3S-GTE/3S-GE engines.
- 6.0 mm valve-stem application; verify the cylinder head and guide dimensions before machining.
- CNC-machined manganese-silicon-aluminum-bronze alloy.
- Set of eight guides for the exhaust positions.
- Designed to work with compatible Brian Crower stainless-steel valves.
Fitment
| Years | Make | Model | Submodel / requirements |
|---|---|---|---|
| 1991–1995 | Toyota | MR2 | Turbo; 3S-GTE, 6.0 mm exhaust-valve stems |
| 1988–1992 | Toyota | Celica | All Trac; 3S-GTE, 6.0 mm exhaust-valve stems |
| 1993 | Toyota | Celica | GTS All Trac; 3S-GTE, 6.0 mm exhaust-valve stems |
The BC3937 is an engine and cylinder-head component. Verify the installed head, valve-stem size and machining requirements before relying on vehicle-year fitment.
Specifications
| Detail | Value |
|---|---|
| Brand | Brian Crower / runBC |
| Manufacturer part number | BC3937 |
| Part type | Exhaust valve guides |
| Engine family | Toyota 3S-GTE / 3S-GE |
| Valve-stem application | 6.0 mm |
| Guide material | Manganese-silicon-aluminum bronze |
| Guide position | Exhaust |
| Quantity | 8 guides |
What's Included
- Eight Brian Crower BC3937 exhaust valve guides.
- Valves, springs, seals and cylinder-head machining are not included in this guide set.
About Brian Crower
Brian Crower develops performance engine valvetrain components. Its Toyota 3S engine offerings include valve guides, intake guides, springs and related cylinder-head parts.
Related Parts
- Brian Crower Toyota 3S-GTE valve spring set — verify the specific head and valvetrain build.
- Supertech 6 mm exhaust valve stem seals, set of 8 — confirm seal-to-guide compatibility with your engine builder.
FAQ
What is the BC3937?It is a set of eight 6.0 mm exhaust valve guides for compatible Toyota 3S-GTE/3S-GE cylinder heads.
Is this for intake or exhaust valves?This set is intended for exhaust valves. Intake guides are a separate part.
How many guides come in the package?Eight exhaust valve guides are specified.
What material are the guides made from?Brian Crower specifies a manganese-silicon-aluminum-bronze alloy.
Does this fit a Toyota MR2 Turbo?It is listed for Toyota 3S-GTE applications including the MR2 Turbo; match the installed cylinder-head generation and stem dimensions before ordering.
Does it fit a Celica All-Trac?It may suit 3S-GTE All-Trac builds using the specified exhaust-valve configuration; verify the specific head.
Can the guides be installed without machining?Professional cylinder-head measurement, guide installation and final sizing are recommended; follow the engine builder's tolerances.
Are valves or seals included?No. This listing is for the exhaust valve-guide set only.
Installation Instructions
- Confirm the exact Toyota 3S cylinder head and inspect exhaust valve-stem dimensions.
- Have a qualified cylinder-head machine shop measure guide bores and assess wear.
- Remove old guides using the correct head-support and temperature-control procedure.
- Install BC3937 guides to the manufacturer's appropriate interference-fit specifications and finish-size the bores as required.
- Verify valve-stem clearance, seat alignment, seals and assembled valvetrain before operation.
California Proposition 65 Warning
WARNING: Cancer and Reproductive Harm — www.P65Warnings.ca.gov.
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