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Valvetrain

Valvetrain

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-15%
GSC Power-Division Intake Valve Set of 8-36mm (+1mm) (gsc2044-8) Quick View
GSC Power-Division

GSC Power-Division Intake Valve Set of 8-36mm (+1mm) (gsc2044-8)

$151.37
$128.66
GPVN_2044-8
Engine GSC Power-Division Valvetrain
When creating our new valve line we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D...
-15%
GSC Power-Division Exhaust Valve Set of 8-30mm (STD) (gsc2041-8) Quick View
GSC Power-Division

GSC Power-Division Exhaust Valve Set of 8-30mm (STD) (gsc2041-8)

$239.32
$203.42
GPVN_2041-8
Engine GSC Power-Division Valvetrain
When creating our new valve line we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D...
-15%
GSC Power-Division 23-8N Exhaust Valve Set of 12-29mm (STD) (gsc2061-12) Quick View
GSC Power-Division

GSC Power-Division 23-8N Exhaust Valve Set of 12-29mm (STD) (gsc2061-12)

$307.60
$261.46
GPVN_2061-12
Engine GSC Power-Division Valvetrain
When creating our new valve line we set out to create the best performance, longest lasting valves available to the aftermarket. Using advanced 3D...
-15%
GSC Power-Division Beehive Valve Spring Kit for FA20 WRX/BRZ/FRS (gsc5056) Quick View
GSC Power-Division

GSC Power-Division Beehive Valve Spring Kit for FA20 WRX/BRZ/FRS (gsc5056)

$526.73
$447.72
GPVN_5056
Engine GSC Power-Division Valvetrain
The GSC Power-Division Beehive Spring Kit with Titanium Retainers for the Subaru 2015 WRX, BRZ and Scion FRS includes 16 titanium retainers, 16 beehive...
-5%
Skunk2 Racing Alpha Series Valve Spring Retainer Set (308-05-1410) Quick View
Skunk2 Racing

Skunk2 Racing Alpha Series Valve Spring Retainer Set (308-05-1410)

$216.15
$205.34
BJWR_308-05-1410
Engine Skunk2 Racing Valvetrain
Titainium w/7deg. Lock Seat-Must Use Skunk2 P/N: 312-05-0010 (Locks) on 05+K Series. Skunk2's industry-leading Alpha Titanium Retainers are designed to significantly reduce valvetrain mass,...
-5%
Skunk2 Racing Engine Bay Dress Up VTEC Solenoid Housing (639-05-0205) Quick View
Skunk2 Racing

Skunk2 Racing Engine Bay Dress Up VTEC Solenoid Housing (639-05-0205)

$115.75
$109.96
BJWR_639-05-0205
Engine Skunk2 Racing Valvetrain
Black Anodized-Re-Use OEM Pressure Sensor; Gasket; and Internals. The first of its kind, Skunk2's Black Series Billet VTEC Solenoid is designed to be used...
-4%
Skunk2 Racing Ultra Series Valve Set (310-05-9310) Quick View
Skunk2 Racing

Skunk2 Racing Ultra Series Valve Set (310-05-9310)

$450.05
$427.55
BJWR_310-05-9310
Engine Skunk2 Racing Valvetrain
Standard Compression Dished Face-PVD Chromium Nitride Coated 33mm HNV-3 Stainless Intake 28mm EV8 Stainless Exhaust-1pc. Forged. Skunk2 Ultra Series valves are our premium line...
-5%
Skunk2 Racing Engine Bay Dress Up VTEC Solenoid Housing (639-05-0105) Quick View
Skunk2 Racing

Skunk2 Racing Engine Bay Dress Up VTEC Solenoid Housing (639-05-0105)

$115.75
$109.96
BJWR_639-05-0105
Engine Skunk2 Racing Valvetrain
Black Anodized-Re-Use OEM Pressure Sensor; Gasket; and Internals. The first of its kind, Skunk2's Black Series Billet VTEC Solenoid is designed to be used...
-5%
Skunk2 Racing Engine Bay Dress Up VTEC Solenoid Housing (639-05-0305) Quick View
Skunk2 Racing

Skunk2 Racing Engine Bay Dress Up VTEC Solenoid Housing (639-05-0305)

$115.75
$109.96
BJWR_639-05-0305
Engine Skunk2 Racing Valvetrain
Black Anodized-Re-Use OEM Pressure Sensor; Gasket; and Internals. The first of its kind, Skunk2's Black Series Billet VTEC Solenoid is designed to be used...
-4%
Skunk2 Racing Valve Spring Base Set (312-05-0015) Quick View
Skunk2 Racing

Skunk2 Racing Valve Spring Base Set (312-05-0015)

$48.25
$45.84
BJWR_312-05-0015
Engine Skunk2 Racing Valvetrain
Chromoly Spring Base w/.480in. ID Spring Step-Use on H Series VTEC Engines When Upgrading to Skunk2 Pro Series Valve Springs. Skunk2's high-quality Spring Bases...
-4%
Skunk2 Racing Ultra Series Valve Set (310-05-9535) Quick View
Skunk2 Racing

Skunk2 Racing Ultra Series Valve Set (310-05-9535)

$450.05
$427.55
BJWR_310-05-9535
Engine Skunk2 Racing Valvetrain
Standard Compression Dished Face-PVD Chromium Nitride Coated 35mm HNV-3 Stainless Intake 30mm EV8 Stainless Exhaust-1pc. Forged. Skunk2 Ultra Series valves are our premium line...
-5%
Skunk2 Racing Alpha Series Valve Set (310-05-1555) Skunk2 Racing Alpha Series Valve Set (310-05-1555) Quick View
Skunk2 Racing

Skunk2 Racing Alpha Series Valve Set (310-05-1555)

$317.55
$301.67
BJWR_310-05-1555
Engine Skunk2 Racing Valvetrain
Standard Compression Dished Face-Hard Chrome Plated 36mm HNV-3 Stainless Intake 30mm EV8 Stainless Exhaust-1pc. Forged. Skunk2 Alpha Series Valves for the Honda K20 and...
-5%
Skunk2 Racing Engine Bay Dress Up VTEC Solenoid Housing (639-05-0400) Quick View
Skunk2 Racing

Skunk2 Racing Engine Bay Dress Up VTEC Solenoid Housing (639-05-0400)

$115.75
$109.96
BJWR_639-05-0400
Engine Skunk2 Racing Valvetrain
Hard Anodized-Re-Use OEM Pressure Sensor; Gasket; and Internals. The first of its kind, Skunk2's Hard Anodized Billet VTEC Solenoid is designed to be used...
-5%
Skunk2 Racing Pro Series XP Valve Spring Set (311-05-7380) Quick View
Skunk2 Racing

Skunk2 Racing Pro Series XP Valve Spring Set (311-05-7380)

$406.35
$386.03
BJWR_311-05-7380
Engine Skunk2 Racing Valvetrain
Seat Pressure: 100 lbs at 1.600in.-Open Pressure: 255 lbs at 1.100in.-Coil Bind: .890in.-Max Lift: .680in. Must Use Skunk2 P/N: 312-05-0010 (Spring Bases) to Install...
-10%
Tomei INNER SHIM KIT 2JZ-GTE(TA312A-TY03A) Quick View
Tomei

Tomei INNER SHIM KIT 2JZ-GTE(TA312A-TY03A)

$1,140.00
$1,026.00
GPVC_TA312A-TY03A
Engine Tomei Valvetrain
Achieve 11.0mm lift with the inner shim kit. Without utilizing the inner shim kit, the 11.0mm lift cam will cause the outer shim to...
-10%
Tomei SOLID PIVOT SHIM/GUIDE GUIDE SR20DE(T) 2.85mm 1pc(TA308F-NS285) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE GUIDE SR20DE(T) 2.85mm 1pc(TA308F-NS285)

$10.00
$9.00
GPVC_TA308F-NS285
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei SOLID PIVOT SHIM/GUIDE GUIDE SR20DE(T) 2.75mm 1pc(TA308F-NS275) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE GUIDE SR20DE(T) 2.75mm 1pc(TA308F-NS275)

$10.00
$9.00
GPVC_TA308F-NS275
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei SOLID PIVOT SHIM/GUIDE GUIDE SR20DE(T) 2.70mm 1pc(TA308F-NS270) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE GUIDE SR20DE(T) 2.70mm 1pc(TA308F-NS270)

$10.00
$9.00
GPVC_TA308F-NS270
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei SOLID PIVOT SHIM/GUIDE GUIDE SR20DE(T) 2.65mm 1pc(TA308F-NS265) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE GUIDE SR20DE(T) 2.65mm 1pc(TA308F-NS265)

$10.00
$9.00
GPVC_TA308F-NS265
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei SOLID PIVOT SHIM/GUIDE GUIDE SR20DE(T) 2.60mm 1pc(TA308F-NS260) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE GUIDE SR20DE(T) 2.60mm 1pc(TA308F-NS260)

$10.00
$9.00
GPVC_TA308F-NS260
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 3.05mm 1pc(TA308E-NS305) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 3.05mm 1pc(TA308E-NS305)

$10.00
$9.00
GPVC_TA308E-NS305
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 3.00mm 1pc(TA308E-NS300) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 3.00mm 1pc(TA308E-NS300)

$10.00
$9.00
GPVC_TA308E-NS300
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 2.85mm 1pc(TA308E-NS285) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 2.85mm 1pc(TA308E-NS285)

$10.00
$9.00
GPVC_TA308E-NS285
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 2.75mm 1pc(TA308E-NS275) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 2.75mm 1pc(TA308E-NS275)

$10.00
$9.00
GPVC_TA308E-NS275
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 2.70mm 1pc(TA308E-NS270) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 2.70mm 1pc(TA308E-NS270)

$10.00
$9.00
GPVC_TA308E-NS270
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 2.65mm 1pc(TA308E-NS265) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 2.65mm 1pc(TA308E-NS265)

$10.00
$9.00
GPVC_TA308E-NS265
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 2.60mm 1pc(TA308E-NS260) Quick View
Tomei

Tomei SOLID PIVOT SHIM/GUIDE SHIM SR20DE(T) 2.60mm 1pc(TA308E-NS260)

$10.00
$9.00
GPVC_TA308E-NS260
Engine Tomei Valvetrain
In order to make cam clearance maintenance-free and quieter operation sound, the hydraulic lash adjuster was adopted for the SR20 engine. However when aiming...
-10%
Tomei VALVE LIFTER SHIM RB25DE(T)/RB20DE(T)/VG30DE(TT)/CA18DE(T) 2.90mm 1pc(TA307E-NS290) Quick View
Tomei

Tomei VALVE LIFTER SHIM RB25DE(T)/RB20DE(T)/VG30DE(TT)/CA18DE(T) 2.90mm 1pc(TA307E-NS290)

$10.00
$9.00
GPVC_TA307E-NS290
Engine Tomei Valvetrain
Camshafts are one of the most sufficient ways of making high performance engine to install the high lift camshaft. However, in some engines, it...
-10%
Tomei VALVE LIFTER SHIM RB25DE(T)/RB20DE(T)/VG30DE(TT)/CA18DE(T) 2.85mm 1pc(TA307E-NS285) Quick View
Tomei

Tomei VALVE LIFTER SHIM RB25DE(T)/RB20DE(T)/VG30DE(TT)/CA18DE(T) 2.85mm 1pc(TA307E-NS285)

$10.00
$9.00
GPVC_TA307E-NS285
Engine Tomei Valvetrain
Camshafts are one of the most sufficient ways of making high performance engine to install the high lift camshaft. However, in some engines, it...
-10%
Tomei VALVE LIFTER SHIM RB25DE(T)/RB20DE(T)/VG30DE(TT)/CA18DE(T) 2.80mm 1pc(TA307E-NS280) Quick View
Tomei

Tomei VALVE LIFTER SHIM RB25DE(T)/RB20DE(T)/VG30DE(TT)/CA18DE(T) 2.80mm 1pc(TA307E-NS280)

$10.00
$9.00
GPVC_TA307E-NS280
Engine Tomei Valvetrain
Camshafts are one of the most sufficient ways of making high performance engine to install the high lift camshaft. However, in some engines, it...
-10%
Tomei VALVE LIFTER SHIM RB25DE(T)/RB20DE(T)/VG30DE(TT)/CA18DE(T) 2.10mm 1pc(TA307E-NS210) Quick View
Tomei

Tomei VALVE LIFTER SHIM RB25DE(T)/RB20DE(T)/VG30DE(TT)/CA18DE(T) 2.10mm 1pc(TA307E-NS210)

$10.00
$9.00
GPVC_TA307E-NS210
Engine Tomei Valvetrain
Camshafts are one of the most sufficient ways of making high performance engine to install the high lift camshaft. However, in some engines, it...
-10%
VALVE LIFTER SET CA18DE(T) SOLID TYPE (TA307A-NS11A) Quick View
Tomei

VALVE LIFTER SET CA18DE(T) SOLID TYPE (TA307A-NS11A)

$240.00
$216.00
GPVC_TA307A-NS11A
Engine Tomei Valvetrain
Camshafts are one of the most sufficient ways of making high performance engine to install the high lift camshaft. However, in some engines, it...
-10%
VALVE SPRING SEAT SET SR SERIES 0.5mm 8pcs (TA305A-NS08C) Quick View
Tomei

VALVE SPRING SEAT SET SR SERIES 0.5mm 8pcs (TA305A-NS08C)

$11.00
$9.90
GPVC_TA305A-NS08C
Engine Tomei Valvetrain
When installing aftermarket valve springs in a head assembly, the amount of load applied to each spring need to be adjusted until everything is...
-10%
VALVE SPRING SEAT SET SR SERIES 0.3mm 8pcs (TA305A-NS08B) Quick View
Tomei

VALVE SPRING SEAT SET SR SERIES 0.3mm 8pcs (TA305A-NS08B)

$11.00
$9.90
GPVC_TA305A-NS08B
Engine Tomei Valvetrain
When installing aftermarket valve springs in a head assembly, the amount of load applied to each spring need to be adjusted until everything is...
-10%
TOMEI RACING VALVE FA20DIT 2015+ (TA303A-SB04A) Quick View
Tomei

TOMEI RACING VALVE FA20DIT 2015+ (TA303A-SB04A)

$560.00
$504.00
GPVC_TA303A-SB04A
Engine Tomei Valvetrain
Tomei Racing Valves for FA20DIT 2015+ Maximize the airflow and efficiency of your FA20DIT 2015+ engine with Tomei's high-performance racing valves. These valves are...
-10%
RACING VALVE SET FA20 (TA303A-SB03A) RACING VALVE SET FA20 (TA303A-SB03A) Quick View
Tomei

RACING VALVE SET FA20 (TA303A-SB03A)

$560.00
$504.00
GPVC_TA303A-SB03A
Engine Tomei Valvetrain
Tomei Racing Valves are application specific, highly durable engine valves designed for use in turbocharged and naturally aspirated engines that are subject to extreme...
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The valvetrain is the mechanical connection between the camshaft and intake and exhaust valves. It transforms the profiles of the rotating cam lobes into the opening and closing motion of the valves. Overhead Valve (OHV) engines have the most complex valvetrains with lifters, pushrods, and rocker arms between the cam and valves, while Overhead Camshaft (OHC) engines are much simpler, with some designs having only bucket lifters between the cam and valves.

Performance valvetrain components must be much stronger to function at high RPMs and overcome stiff valve spring pressure to open larger valves. Higher valve spring pressure is needed to prevent valve float at high RPM. Performance rocker arms and valve spring retainers are made of lighter materials to enable the engine to rev easier and achieve higher RPM, and components like roller lifters and roller rockers reduce power-robbing friction.

The OEMs switched to roller lifters long ago because roller operation made camshafts and lifters much more reliable than their flat-tappet predecessors. But reduced friction and improved durability are not the only benefits. Roller cams have much more aggressive ramp rates that would cause a flat tappet lifter to dig into the ramp.These ramp rates allow the valves to open faster and remain at high lift for most of the opening duration, which increases power. Roller cams are also much more tolerant of high valve spring pressure. Roller cam and lifter kits are available to convert older flat tappet engines.

Performance pushrods have to operate reliably at RPMs and against valve spring pressures that would bend or break their OE counterparts. Most performance pushrods are made of strong chrome moly steel, and larger diameter pushrods are available for some applications. Overcoming friction, such as is created when rocker arms pivot on balls or shafts and slide across valve stem tips, uses horsepower. You can eliminate this friction and save weight by replacing OE steel rocker arms with lightweight aluminum roller fulcrum and roller tip rocker arms. These are often available in higher ratios to increase valve lift and power.

Some cylinder heads can be fitted with larger valves, but they're most often acquired as part of a complete set of performance cylinder heads. Larger valves allow more flow in and out of the combustion chamber for more power, but they can be heavier and high RPM use requires stronger valve springs to prevent valve float. High tensile strength dual or beehive springs with lightweight titanium retainers are state-of-the-art. Finally, there are some performance valvetrain components that have no OE counterpart. For example, stud girdles support and strengthen individual rocker stud valvetrains to prevent deflection.

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