PRODUCT DETAILS
SpeedFactory 5.5mm Viton Valve Stem Seals - Honda/Acura B/D/F/H/K Series and F20C/F22C
Got blue smoke coming out of your exhaust when you start your car or hit the gas hard? That's your valve stem seals leaking oil into the combustion chamber. SpeedFactory makes these seals from DuPont Viton, which lasts way longer than the factory rubber seals. Viton handles heat and aggressive fuels better, so if you're rebuilding your head or replacing worn seals, these are what you need. They're sized for 5.5mm valve stems, which is what most aftermarket performance valves use.
What Happens When Valve Stem Seals Wear Out
Valve stem seals sit at the top of each valve guide and keep engine oil from dripping down into the combustion chamber. Factory seals are rubber, and after years of heat cycling and oil exposure, rubber gets hard and cracks. Once they crack, oil seeps past the valve guide and into the cylinder. When that oil burns, you get blue smoke. If you're seeing smoke on cold starts or during hard acceleration, your seals are done.
Why Viton Works Better
SpeedFactory uses DuPont Viton for these seals instead of standard rubber. Viton's rated for 400°F continuous use, which is way higher than what your head reaches even during hard driving. It also holds up to E85, race gas, and synthetic oils without breaking down. If you're running aggressive fuels or you're pushing your motor hard, Viton seals hold up where rubber seals fail.
These Are for 5.5mm Valve Stems
These seals fit 5.5mm valve stems. Factory Honda valve stems vary by engine—some use 5mm intake and 5.5mm exhaust, others use different combos. If you're swapping to aftermarket valves from companies like Supertech, Ferrea, or Del West, most of those use 5.5mm stems for both intake and exhaust. Confirm your valve stem diameter before ordering or you'll get seals that don't fit.
Sold as Individual Sets
You're buying a set of 8 seals—either intake or exhaust, not both. Since most Honda engines run 8 intake valves and 8 exhaust valves, you'll need to order two separate sets to do a full head. One intake set, one exhaust set. Don't try to save money by only doing half the head. If half your seals are shot, the other half isn't far behind.
What You Get
- SpeedFactory 5.5mm Viton valve stem seals (8-piece set, intake or exhaust)
- DuPont Viton construction
- 400°F continuous temperature rating
- Compatible with E85, race fuel, and synthetic oils
- Machined metal jacket construction
- Internal garter spring for constant tension
- Polished sealing surfaces
Compatible Engines
- B-series VTEC (B16, B17, B18C)
- D-series (D15, D16 with 5.5mm stems)
- F-series VTEC (F20B, F22B VTEC)
- H-series VTEC (H22A, H23A VTEC)
- K-series (K20, K24)
- F20C, F22C (S2000)
Fits Your Car
- 1989-2001 Acura Integra
- 2002-2006 Acura RSX
- 2004-2008 Acura TSX
- 1988-2000 Honda Civic
- 2002-2011 Honda Civic Si
- 1988-1991 Honda CRX
- 1993-1997 Honda Del Sol
- 1990-2007 Honda Accord
- 1997-2006 Honda CR-V
- 1992-2001 Honda Prelude
- 2000-2009 Honda S2000
Note: Only works with 5.5mm valve stems. Verify your valve stem diameter before ordering. Most aftermarket performance valves are 5.5mm for both intake and exhaust, but factory sizes vary by engine. You need two sets for a complete head—one intake, one exhaust. Installing valve stem seals requires a valve spring compressor and proper procedure. If you don't know how to set valve spring installed height correctly, take your head to a machine shop.