Supertech BMW Internal Engine Parts for BMW Z Series E85/6 (2003-2008)

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Rebuilding your engine or giving your cylinder head an overhaul? Internal engine components covers parts that are located within the engine block and cylinder head. Examples include: timing chains and tensioners, rocker arms, rod bolts and studs, head bolts, valve springs, connecting rods, and more. These are Genuine BMW engine parts, performance upgrades, or approved aftermarket brands that have a long track record of reliability and quality.

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Supertech Upgraded Valve Stem Seal Kit - BMW S54 S52 S50 M54 M52 M50
Supertech Upgraded Valve Stem Seal Kit - BMW S54 S52 S50 M54 M52 M50 ...
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T#:641030
Part#: VS-VBM6-6CYLKT
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$ 27.99 USD
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$ 27.99 USD
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Includes a full set of polyacrylic intake and viton exhaust valve stem seals! Looking to replace your valve stem seals due to leaks, cracks, splits, or even during an upgrade of your camshafts, valve springs, or valves? Supertech valve stem seals are the way to go! This cheap but effective seal replaces the stock BMW seals that are notoriously prone to issues due to heat cycles and chemicals which cause the seals to become weak and brittle. Supertech seals offer a significantly longer life span and are resistant to both heat and chemicals thanks to their use of Viton or Polyacrylic construction (dependant on valve type). That means less time in the garage and more time on the street or track! These seals are also great for anyone who is looking to upgrade to dual valve springs thanks to the seal's overall thinner outer diameter! Guide OD: 8.8mm/.347" Seal OD: 12.2mm/.480"
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SuperTech Dual Valve Spring Upgrade Kit w/ Steel Retainers - 80lbs - BMW M50 M52 M54 S52
SuperTech Dual Valve Spring Upgrade Kit w/ Steel Retainers - 80lbs - ...
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T#:26038568
Part#: SPRKH1000DBMST
In Stock
20% off MSRP $ 1,042.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 833.99 USD
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20% off MSRP
$ 1,042.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 833.99 USD
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Crafted from premium Superclean Chrome Silicon Vanadium Steel alloy, these valve springs offer exceptional performance and durability even at high RPMs. CAD engineering ensures that the wire stress levels remain within defined limits for long-lasting durability, even under extreme racing conditions. Advanced computer software allows Supertech to meticulously control harmonics, ensuring optimal performance. Manufactured with high-quality military-certified Steel, the retainers are CNC machined to provide a precise fit, guaranteeing longevity and reliability.
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BMW M42 M50 M52 M54 6mm Single Groove Valve Keeper - Set Of 24
BMW M42 M50 M52 M54 6mm Single Groove Valve Keeper - Set Of 24 ...
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T#:21604313
Part#: KPR-6S-7-24
Ships in 5 Business Days
$ 51.99 USD
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$ 51.99 USD
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BMW M42 M50 M52 M54 6mm Single Groove Valve Keeper is a precision-engineered component essential for securing valves in BMW engines. Turner Motorsport offers this high-quality valve keeper, designed to fit specific Supertech valves for enhanced performance and reliability.

  • Precision Fit: Designed specifically for BMW M42, M50, M52, and M54 engines, ensuring a perfect fit with 6.0mm single groove valves.
  • High-Quality Construction: Made from durable materials to withstand high-pressure conditions and provide long-lasting performance.
  • Enhanced Valve Security: Two keepers are required per valve to securely hold the valve in place, preventing movement and ensuring consistent engine performance.
  • Compatibility: Ideal for use with certain Supertech valves, providing a reliable solution for engine builds and upgrades.
  • Easy Installation: Simple to install with standard tools, offering a hassle-free upgrade or replacement option.
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Supertech BMW S54 Dual VALVE Spring Kit - E46 M3 Z3M Z4M
Supertech BMW S54 Dual VALVE Spring Kit - E46 M3 Z3M Z4M
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T#:7403169
Part#: SPRK-2521-2BM-T1
In Stock
$ 1,050.99

This product was last offered at the strikethrough price on
05-03-2026

$ 919.99 USD
Limited Qty Sale
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$ 1,050.99

This product was last offered at the strikethrough price on
05-03-2026

$ 919.99 USD
Limited Qty Sale
Free Shipping
Add to Wish List
Dual valve spring kit to be used with triple groove valves and OEM locks.
Supertech High Performance Valve Spring Set - E46 M3, MZ3 (S54), MZ4
Supertech High Performance Valve Spring Set - E46 M3, MZ3 (S54), MZ4 ...
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T#:11760
Part#: TMS11760
Ships in 8 Business Days
$ 1,038.99 USD
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$ 1,038.99 USD
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For BMW's with S54 engines, these valve springs are made with premium Superclean Chrome Silicon Vanadium Steel alloy for high performance and durability at high rpms, with better memory. These are extremely high quality, offered at the best price.

Computer designed to ensure that the wire stress levels do not overpass the limits of stress defined in the diagrams of fatigue for long durability under extreme racing conditions. Computer software allows Supertech to make sure that the harmonics are well under control.

The retainers are manufactured with high quality military certified Titanium alloy, CNC machined for a tight fit that will ensure a long durability.

This item fits the following BMWs:
2001-2006 E46 BMW M3
2001-2002 Z3 BMW M Roadster M Coupe
2006-2008 E85 BMW Z4 M Roadster M Coupe
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Single Groove Valve Keeper 6mm - Priced Each
Single Groove Valve Keeper 6mm - Priced Each
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Supertech - Corporate Logo
T#:3268708
Part#: KPR-6S-7
In Stock
$ 5.99

This product was last offered at the strikethrough price on
03-04-2026

$ 2.99 USD
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$ 2.99 USD
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Two required per valve, for use with certain supertech valves 6.0mm single groove
Supertech 6mm Exhaust Valve Stem Seal - Viton - BMW S54 S52 S50 M54 M52 M50 M42
Supertech 6mm Exhaust Valve Stem Seal - Viton - BMW S54 S52 S50 M54 M...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Supertech - Corporate Logo
T#:641010
Part#: VS-VBM6E
In Stock
$ 1.99 USD
Free Shipping on orders $49 and up
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$ 1.99 USD
Free Shipping on orders $49 and up
Add to Wish List
Looking to replace your valve stem seals due to leaks, cracks, splits, or even during an upgrade of your camshafts, valve springs, or valves? Supertech valve stem seals are the way to go! This cheap but effective seal replaces the stock BMW seals that are notoriously prone to issues due to heat cycles and chemicals which cause the seals to become weak and brittle. Supertech seals offer a significantly longer life span and are resistant to both heat and chemicals thanks to their use of Viton or Polyacrylic construction (dependant on valve type). That means less time in the garage and more time on the street or track! These seals are also great for anyone who is looking to upgrade to dual valve springs thanks to the seal's overall thinner outer diameter! Guide OD: 8.8mm/.347" Seal OD: 12.2mm/.480"
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SuperTech Dual Valve Spring Upgrade Kit w/ Steel Retainers - 67lbs - BMW M50 M52 M54 S52
SuperTech Dual Valve Spring Upgrade Kit w/ Steel Retainers - 67lbs - ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Supertech - Corporate Logo
T#:51426477
Part#: SPRKH100DRBMST
In Stock at Vendor
New Item
$ 833.99 USD
Add to Wish List
$ 833.99 USD
Add to Wish List
Crafted from premium Superclean Chrome Silicon Vanadium Steel alloy, these valve springs offer exceptional performance and durability even at high RPMs. CAD engineering ensures that the wire stress levels remain within defined limits for long-lasting durability, even under extreme racing conditions. Advanced computer software allows Supertech to meticulously control harmonics, ensuring optimal performance. Manufactured with high-quality military-certified Steel, the retainers are CNC machined to provide a precise fit, guaranteeing longevity and reliability.
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Supertech 6mm Intake Valve Stem Seal - Polyacrylic - BMW S54 S52 S50 M54 M52 M50 M42
Supertech 6mm Intake Valve Stem Seal - Polyacrylic - BMW S54 S52 S50 ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Supertech - Corporate Logo
T#:641011
Part#: VS-VBM6I
In Stock
$ 1.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 1.99 USD
Free Shipping on orders $49 and up
Add to Wish List
Looking to replace your valve stem seals due to leaks, cracks, splits, or even during an upgrade of your camshafts, valve springs, or valves? Supertech valve stem seals are the way to go! This cheap but effective seal replaces the stock BMW seals that are notoriously prone to issues due to heat cycles and chemicals which cause the seals to become weak and brittle. Supertech seals offer a significantly longer life span and are resistant to both heat and chemicals thanks to their use of Viton or Polyacrylic construction (dependant on valve type). That means less time in the garage and more time on the street or track! These seals are also great for anyone who is looking to upgrade to dual valve springs thanks to the seal's overall thinner outer diameter! Guide OD: 8.8mm/.347" Seal OD: 12.2mm/.480"
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Valve keeper for Audi/BMW/Opel 6mm stem Triple groove - Supertech
Valve keeper for Audi/BMW/Opel 6mm stem Triple groove - Supertech ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Supertech - Corporate Logo
T#:26704985
Part#: KPR-VW6-T
Ships in 8 Business Days
$ 1.99 USD
Free Shipping on orders $49 and up
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$ 1.99 USD
Free Shipping on orders $49 and up
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