-14%
GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.001 Quick View

GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.001" OD (gsc3074.001-1)

$10.49
$8.92
GPVN_3074.001-1
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.003 Quick View

GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.003" OD (gsc3074.003-1)

$10.49
$8.92
GPVN_3074.003-1
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Intake or Exhaust Valve Guide Set of 16-Standard (gsc3074-8) Quick View

GSC Power-Division Intake or Exhaust Valve Guide Set of 16-Standard (gsc3074-8)

$80.90
$68.77
GPVN_3074-8
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Intake or Exhaust Single Valve Guide-Standard (gsc3074) Quick View

GSC Power-Division Intake or Exhaust Single Valve Guide-Standard (gsc3074)

$10.49
$8.92
GPVN_3074
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.001 Quick View

GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.001" OD (gsc3073.001-1)

$10.49
$8.92
GPVN_3073.001-1
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.003 Quick View

GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.003" OD (gsc3073.003-1)

$10.49
$8.92
GPVN_3073.003-1
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Intake or Exhaust Valve Guide Set of 16-Standard (gsc3071-8) Quick View

GSC Power-Division Intake or Exhaust Valve Guide Set of 16-Standard (gsc3071-8)

$80.90
$68.77
GPVN_3071-8
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Intake or Exhaust Single Valve Guide-Standard (gsc3073) Quick View

GSC Power-Division Intake or Exhaust Single Valve Guide-Standard (gsc3073)

$10.49
$8.92
GPVN_3073
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Intake or Exhaust Valve Guide Set of 16-Standard (gsc3073-8) Quick View

GSC Power-Division Intake or Exhaust Valve Guide Set of 16-Standard (gsc3073-8)

$80.90
$68.77
GPVN_3073-8
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.001 Quick View

GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.001" OD (gsc3071.001-1)

$10.49
$8.92
GPVN_3071.001-1
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Intake or Exhaust Single Valve Guide-Standard (gsc3071) Quick View

GSC Power-Division Intake or Exhaust Single Valve Guide-Standard (gsc3071)

$10.49
$8.92
GPVN_3071
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.003 Quick View

GSC Power-Division Intake or Exhaust Single Valve Guide-Oversize +.003" OD (gsc3071.003-1)

$10.49
$8.92
GPVN_3071.003-1
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Stopper-Style Intake Valve Guide for Mitsubishi 4B11T (gsc3013-8) Quick View

GSC Power-Division Stopper-Style Intake Valve Guide for Mitsubishi 4B11T (gsc3013-8)

$51.69
$43.94
GPVN_3014-8
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Stopper-Style Exhaust Valve Guide for Mitsubishi 4B11T (gsc3013-8) Quick View

GSC Power-Division Stopper-Style Exhaust Valve Guide for Mitsubishi 4B11T (gsc3013-8)

$51.69
$43.94
GPVN_3013-8
Engine GSC Power-Division Valvetrain
GSC has quite simply made a series of valve guides that fit properly, are easier to install, and shaped to help air flow instead...
-14%
GSC Power-Division Viton Valve Stem Seals for the Toyota 1JZ and 2JZ Platform (gsc1028) Quick View

GSC Power-Division Viton Valve Stem Seals for the Toyota 1JZ and 2JZ Platform (gsc1028)

$12.43
$10.57
GPVN_1028
Engine GSC Power-Division Valvetrain
GSC Power-Division Viton Valve Stem Seals for the Toyota 1JZ and the 2JZ 6mm valve size seal set. These are an upgrade from the...
-14%
GSC Power-Division Viton Valve Stem Seals for the Toyota 2JZ 6.6mm exhaust valve stem (gsc1029) Quick View

GSC Power-Division Viton Valve Stem Seals for the Toyota 2JZ 6.6mm exhaust valve stem (gsc1029)

$12.43
$10.57
GPVN_1029
Engine GSC Power-Division Valvetrain
GSC Power-Division Viton Valve Stem Seals for the Toyota 2JZ 6.6mm exhaust valve. These are an upgrade from the standard OEM material to help...
-14%
GSC Power-Division Viton Valve Stem Seals for the Toyota 3SGTE (gsc1031) Quick View

GSC Power-Division Viton Valve Stem Seals for the Toyota 3SGTE (gsc1031)

$16.75
$14.24
GPVN_1031
Engine GSC Power-Division Valvetrain
GSC Power-Division Viton Valve Stem Seals for the Toyota 3S-GTE 6mm valve size seal set. These are an upgrade from the standard OEM material...
-15%
GSC Power-Division Viton Valve Stem Seals for the Toyota 1JZ and 2JZ Platform (gsc1030) Quick View

GSC Power-Division Viton Valve Stem Seals for the Toyota 1JZ and 2JZ Platform (gsc1030)

$24.84
$21.11
GPVN_1030
Engine GSC Power-Division Valvetrain
GSC Power-Division Viton Valve Stem Seals for the Toyota 1JZ and the 2JZ 6mm valve size seal set. These are an upgrade from the...
-15%
GSC Power-Division Viton Valve Stem Seals (gsc1053) Quick View

GSC Power-Division Viton Valve Stem Seals (gsc1053)

$25.12
$21.35
GPVN_1053
Engine GSC Power-Division Valvetrain
Valve Stem Seals by GSC Power-Division.Designed utilizing the latest technology, this product by GSC Power-Division features premium quality and will perform better than advertised....
-15%
GSC Power-Division Viton Valve Stem Seals (gsc1052) Quick View

GSC Power-Division Viton Valve Stem Seals (gsc1052)

$15.60
$13.26
GPVN_1052
Engine GSC Power-Division Valvetrain
Valve Stem Seals by GSC Power-Division.Designed utilizing the latest technology, this product by GSC Power-Division features premium quality and will perform better than advertised....
-15%
GSC Power-Division Viton Valve Stem Seals-6mm (gsc1050) Quick View

GSC Power-Division Viton Valve Stem Seals-6mm (gsc1050)

$24.84
$21.11
GPVN_1050
Engine GSC Power-Division Valvetrain
GSC Power-Division Viton Valve Stem Seals for the Nissan VQ35, VR38 and VG30 6mm valve size seal set. These are an upgrade from the...
-14%
GSC Power-Division Viton Valve Stem Seals for the 4B11T (gsc1010) GSC Power-Division Viton Valve Stem Seals for the 4B11T (gsc1010) Quick View

GSC Power-Division Viton Valve Stem Seals for the 4B11T (gsc1010)

$69.30
$58.91
GPVN_1010
Engine GSC Power-Division Valvetrain
GSC Power-Division Viton Valve Stem Seals use genuine DuPont Viton fluoroelastomer material. Viton was specifically developed for the extreme conditions seen in today s...
-14%
GSC Power-Division Viton Valve Stem Seals-6.6mm (gsc1002) Quick View

GSC Power-Division Viton Valve Stem Seals-6.6mm (gsc1002)

$16.75
$14.24
GPVN_1002
Engine GSC Power-Division Valvetrain
GSC Power-Division Viton Valve Stem Seals for the Mitsubishi 4G63T 6.6mm valve size seal set. These are an upgrade from the standard OEM material...
-14%
GSC Power-Division Viton Valve Stem Seals-5.5mm (gsc1041) Quick View

GSC Power-Division Viton Valve Stem Seals-5.5mm (gsc1041)

$16.75
$14.24
GPVN_1041
Engine GSC Power-Division Valvetrain
GSC Power-Division Viton Valve Stem Seals for Honda B18-21, D16, H23 Engines with 6.6mm valve size seal set. These are an upgrade from the...
-14%
GSC Power-Division Viton Valve Stem Seals-5.5mm (gsc1040) Quick View

GSC Power-Division Viton Valve Stem Seals-5.5mm (gsc1040)

$16.75
$14.24
GPVN_1040
Engine GSC Power-Division Valvetrain
GSC Power-Division Viton Valve Stem Seals for the Honda B, H, and K-Series Engines 5.5mm valve size seal set. These are an upgrade from...
-14%
GSC Power-Division Viton Valve Stem Seals for the Subaru/Scion FA Engine (gsc1023) Quick View

GSC Power-Division Viton Valve Stem Seals for the Subaru/Scion FA Engine (gsc1023)

$16.75
$14.24
GPVN_1023
Engine GSC Power-Division Valvetrain
GSC Power-Division Viton Valve Stem Seals kit for the Subaru/Scion FA Engine. These are an upgrade from the standard OEM material to help cope...
-14%
GSC Power-Division Viton Valve Stem Seals for the Subaru EJ Engine (gsc1022) Quick View

GSC Power-Division Viton Valve Stem Seals for the Subaru EJ Engine (gsc1022)

$16.75
$14.24
GPVN_1022
Engine GSC Power-Division Valvetrain
GSC Power-Division Viton Valve Stem Seals for the Subaru EJ257, EJ207, and EJ205 6mm seal set. These are an upgrade from the standard OEM...
-15%
GSC Power-Division Chromoly Valve Spring Seats For 4G63T (+ 0.035 GSC Power-Division Chromoly Valve Spring Seats For 4G63T (+ 0.035 Quick View

GSC Power-Division Chromoly Valve Spring Seats For 4G63T (+ 0.035") (gsc4041)

$57.60
$48.96
GPVN_4041
Engine GSC Power-Division Valvetrain
The GSC4041 CNC turned Chromoly valve spring seats are meant for the 4G63 platforms pushing to the absolute limits, with an additional 0.035 built...
-15%
GSC Power-Division Subaru EJ Valve Spring Seats, OEM Replacement (gsc1005) Quick View

GSC Power-Division Subaru EJ Valve Spring Seats, OEM Replacement (gsc1005)

$26.40
$22.44
GPVN_1005
Engine GSC Power-Division Valvetrain
GSC Power-Division Spring Seats are now available for the Subaru Turbo EJ series. The GSC1005 is an OEM replacement stamped spring seat, useable with...
-15%
GSC Power-Division Chromoly Valve Spring Seat Set for BRZ/FRS/FT86 with 5756 spring kit (gsc4756) Quick View

GSC Power-Division Chromoly Valve Spring Seat Set for BRZ/FRS/FT86 with 5756 spring kit (gsc4756)

$57.60
$48.96
GPVN_4756
Engine GSC Power-Division Valvetrain
GSC valvetrain components are created using the world's most advanced design, FEA, and flow simulation softwares to aid with real world performance testing. Our...
-15%
GSC Power-Division OEM Replacement Valve Spring Seat Set for 4G63T (gsc1004) Quick View

GSC Power-Division OEM Replacement Valve Spring Seat Set for 4G63T (gsc1004)

$26.40
$22.44
GPVN_1004
Engine GSC Power-Division Valvetrain
GSC Power-Division OEM Replacement Valve Spring Seat Set for 4G63T. Perfect for replacing old seats when upgrading to a high performance spring kit like...
-14%
GSC Power-Division OEM Replacement Valve Keeper Set for 4G63T (gsc1003) Quick View

GSC Power-Division OEM Replacement Valve Keeper Set for 4G63T (gsc1003)

$38.50
$32.73
GPVN_1003
Engine GSC Power-Division Valvetrain
GSC Power-Division Valve Keeper (Lock) Set for Mitsubishi 4G63T. Comes as a set for 16 locks (32 pieces) Suitable for all GSC Power-Division valve...
-15%
GSC Power-Division 21-4N Intake Valve Set of 8-35mm (+1mm) (gsc2284-8) Quick View

GSC Power-Division 21-4N Intake Valve Set of 8-35mm (+1mm) (gsc2284-8)

$179.04
$152.18
GPVN_2284-8
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 21-4N Single Intake Valve-35mm (+1mm) (gsc2284-01) Quick View

GSC Power-Division 21-4N Single Intake Valve-35mm (+1mm) (gsc2284-01)

$23.32
$19.82
GPVN_2284-01
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 8-30mm (+1mm) (gsc2283-8) Quick View

GSC Power-Division 23-8N Exhaust Valve Set of 8-30mm (+1mm) (gsc2283-8)

$181.06
$153.90
GPVN_2283-8
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 Single Exhaust Valve-30mm (+1mm) (gsc2283-01) Quick View

GSC Power-Division 23-8N Single Exhaust Valve-30mm (+1mm) (gsc2283-01)

$23.58
$20.04
GPVN_2283-01
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...
Items 325 to 360 of 709 total

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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