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VAC Motorsports Billet Main Caps for BMW S58 Engines

Thu, 30 Jul 2026 11:07:20 GMT

VAC Motorsports Billet Main Caps for BMW S58 Engines
Buy Now: $1,199.95

As horsepower climbs beyond factory limits, the BMW S58 engine places tremendous loads on the crankshaft and main bearing structure. High boost, elevated cylinder pressures, and sustained high RPM can cause factory cast main caps to flex or walk, affecting bearing clearances and long-term engine durability.

The VAC Motorsports Billet Main Caps are precision CNC-machined from premium billet steel to dramatically increase bottom-end rigidity. Designed for professional engine builders and serious enthusiasts, these caps help maintain precise crankshaft alignment while minimizing cap movement under the most demanding racing conditions.

For anyone building an S58 beyond factory power levels, billet main caps provide the confidence and stability needed to support extreme horsepower.

Features

CNC-machined from premium billet steel
Designed specifically for BMW S58 engines
Increased rigidity compared to OEM cast main caps
Helps reduce main cap walk
Improves crankshaft stability
Maintains precise main bearing bore geometry
Promotes consistent oil clearance and bearing life
Designed for extreme horsepower and motorsport applications
Manufactured in the USA

Benefits

Stronger engine foundation
Improved crankshaft control
Increased bearing reliability
Reduced cap flex
Enhanced durability under high boost and RPM
Ideal for competition engine builds

Installation Notes

Professional engine machining is required.

Installation requires:

Line boring
Align honing
Measurement and verification of all main bearing clearances
Complete professional engine assembly procedures

These billet main caps are not intended to be installed without proper machine work.

Recommended Applications

High Boost S58 Builds
Drag Racing
Road Racing
Time Attack
Roll Racing
Standing Mile
Dedicated Competition Engines
1,000+ HP Engine Builds

Engine Fitment

Fits all BMW S58-powered models, including:

BMW G80 M3
BMW G81 M3 Touring
BMW G82 M4
BMW G83 M4 Convertible
BMW F97 X3 M
BMW F98 X4 M
BMW XM (S68-derived architecture not applicable--S58 version only where equipped)

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VAC Motorsports Billet Main Caps for BMW B58 Engines

Thu, 30 Jul 2026 11:05:40 GMT

VAC Motorsports Billet Main Caps for BMW B58 Engines
Buy Now: $1,199.95

When building a high-horsepower BMW B58 engine, the strength of the bottom end becomes just as important as the rotating assembly itself. As cylinder pressure, boost, and RPM increase, the factory cast main caps can begin to flex under extreme loads. Even minimal cap movement can affect main bearing alignment, bearing clearances, and crankshaft stability.

The VAC Motorsports Billet Main Caps are CNC-machined from premium billet steel to provide substantially greater rigidity than the factory main caps. Designed for serious engine builders, these caps help maintain precise main bore geometry, reduce cap walk, and provide the stable crankshaft support required for extreme horsepower applications.

Whether you're building a 900 HP street car or a 1,500+ HP drag or roll racing engine, billet main caps provide one of the strongest foundations for a reliable B58 engine.

Features

CNC-machined from high-strength billet steel
Direct replacement for factory B58 main caps (professional machining required)
Significantly stronger than OEM cast main caps
Helps reduce main cap walk under extreme cylinder pressure
Improves crankshaft stability at high RPM
Maintains consistent main bearing geometry
Promotes improved bearing life and oil clearance consistency
Designed for high-boost and high-horsepower engine builds
Manufactured in the USA

Benefits

Stronger bottom-end foundation
Reduced main cap flex
Improved bearing reliability
Better crankshaft support
Increased durability for extreme horsepower applications
Ideal for race, drag, roll racing, and high-performance street builds

Installation Notes

Professional engine machining is required.

These billet main caps are not a bolt-on upgrade. Installation requires:

Line boring
Align honing
Verification of main bearing housing bore dimensions
Proper main bearing clearance measurement during engine assembly

Failure to perform these machining operations may result in premature bearing failure or engine damage.

Recommended Applications

800+ HP Street Builds
Big Turbo B58 Builds
Drag Racing
Roll Racing
Standing Mile Competition
Road Racing
Dedicated Competition Engines

Engine Fitment

Fits BMW B58 Gen 1 and Gen 2 engines, including:

BMW M140i
BMW M240i
BMW 340i
BMW 440i
BMW 540i
BMW 640i GT
BMW 740i
BMW X3 M40i
BMW X4 M40i
BMW X5 xDrive40i
BMW X6 xDrive40i
BMW X7 xDrive40i
BMW Z4 M40i
Toyota GR Supra (A90/A91)

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GSC Billet Camshaft & Valve Spring Kit for BMW S58 – Stage 1–3

Fri, 5 Dec 2025 07:39:28 GMT

GSC Billet Camshaft & Valve Spring Kit for BMW S58 – Stage 1–3
Buy Now: $1,400.00

GSC's S58 camshaft lineup is the benchmark for power, efficiency, and high-RPM stability in BMW's latest M engines. Whether you're building a responsive street car, a high-boost drag setup, or a full competition engine, GSC cams unlock airflow the factory profiles simply can't deliver.

Pairing these cams with GSC beehive valve springs and titanium retainers is strongly recommended. For full cylinder head builds, we also suggest GSC's upgraded intake/exhaust valves, valve guides, and stem seals for maximum durability and performance.

Stage 1 - 500-900 WHP

Perfect for responsive street/track builds seeking faster throttle response and strong mid-range torque while maintaining excellent drivability.

Benefits:

Ideal operating range: 3500-7500 RPM

Quick throttle response + noticeable mid-range gains

Supports 500-900 WHP

Integrated intake cam trigger

Forged billet construction

Upgraded valve springs required

Specs (7093S1):

Intake: 272° ADV / 232° @ 0.040" / 10.2 mm lift / Variable centerline
Exhaust: 272° ADV / 234° @ 0.040" / 10.6 mm lift / Variable centerline

Stage 2 - 800-1400 WHP

A more aggressive profile aimed at high-boost builds where top-end flow becomes critical. Ideal for upgraded turbo systems and built engines.

Benefits:

Ideal operating range: 4500-8500 RPM

Faster response + stronger mid-range than stock

Supports 800-1400 WHP

Integrated intake cam trigger

Forged billet construction

Upgraded valve springs required

Specs (7093S2):

Intake: 284° ADV / 240° @ 0.040" / 10.2 mm lift / Variable centerline
Exhaust: 288° ADV / 242° @ 0.040" / 10.8 mm lift / Variable centerline

Stage 3 - 1200-1800 WHP

Engineered for competition-level airflow at extremely high engine speeds. Stage 3 shines in big-turbo, high-boost S58 builds that live high in the rev range.

Benefits:

Ideal operating range: 5200-9200 RPM

Massive airflow for top-end horsepower

Supports 1200-1800 WHP

Integrated intake cam trigger

Forged billet construction

Upgraded valve springs required

Specs (7093S3):

Intake: 298° ADV / 254° @ 0.040" / 10.2 mm lift / Variable centerline
Exhaust: 304° ADV / 254° @ 0.040" / 10.8 mm lift / Variable centerline

Important Notes

Upgraded valve springs are required for ALL stages.

A custom ECU tune is mandatory.

Because these cams dramatically increase airflow, the engine will run lean on the factory calibration. A proper tune ensures performance, safety, and drivability.

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Kelford Cams 292in/280ex for BMW M Series S58 Camshafts

Tue, 12 Aug 2025 12:17:22 GMT

Kelford Cams 292in/280ex for BMW M Series S58 Camshafts
Buy Now: $1,199.00

M Series - Stage 1 high performance cams available for BMW's S58 engine. These are suitable for engines producing around 600-850hp with bolt on intake, exhaust and turbo upgrades, and running a 60-68mm turbo.

Camshafts still maintain full use of Valvetronic and Dual VANOS for good throttle response and wide power band.
It is important to also upgrade your valve springs, and we recommend the KVS58-BT valve spring upgrade.

292°/280° | 10.40mm/10.60mm

Stage 2 racing cams for professionally built BMW S58 engines that can deliver 800hp to 1400hp with 66-75mm turbo sizing and aftermarket intake plenums.The cams enable full use of Valvetronic and Dual VANOS while allowing you to lock Valvetronic when using an aftermarket throttle body.

Please check valve-to-piston clearances on full travel of VANOS and Valvetronic
Upgrade valve springs with Kelford Cams' KVS58-BT
Ensure the clearance of the new racing cam lobe with the intake intermediate rockers and trim or deburr OEM pressed steel rockers if necessary.

298°/292° | 10.40mm/10.80mm

Kelford Cams recommends using Stage 3 drag racing cams for S58 engines that are professionally built and capable of making over 1400hp. If you plan on using high boost and 76mm+ turbo sizing, then you should be using either ethanol blend or methanol fuel.

It's important to upgrade your valve springs, KVS58-BT is the recommended option.
Additionally, please double-check clearance for the new racing cam lobe with your intake intermediate rockers.
If you're using OEM pressed steel rockers, be sure to deburr them to avoid any issues with fouling on the larger cam lobe.

All Kelford camshafts are manufactured to a very high grade and set of tolerances to ensure the customer will receive a part that is not only the best for performance, but also excellent for longevity and reliability.

Every camshaft passes through multiple quality control stages and receives a unique laser engraved QC identifier to ensure our team can accurately assist you with any questions you may have of your product. Kelford Cams exist to unleash your engine's power at any build level.

Tech Notes:

VAC recommends pairing these cams with High Performance Valve Springs. This ensures our customers always get the most reliability from their engine by helping to prevent piston-to-valve contact in the event of an over-rev or mis-shift.

All camshafts must be installed by a professional, who can check piston to valve clearances and valve seal clearances.

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Kelford Camshaft Set, Toyota 2JZ-GTE VVTi

Fri, 3 Mar 2023 08:07:06 GMT

Kelford Camshaft Set, Toyota 2JZ-GTE VVTi
Buy Now: $909.95

The Kelford Cams Workshop team is driven by results to consistently deliver client expectations and specifications. Engine Applications include Drifting, Street, Circuit, 1/4 Mile Drag, Rally and more. Winning combination starts at the design stage.

Using state of the art technology combined with cutting edge design software, Kelford Cams pride themselves in being able to provide the most diverse catalog of high-performance camshafts in the market.

Tech Notes:

All camshafts must be installed by a professional, who can check piston to valve clearances and valve seal clearances.

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Kelford Camshaft Set, Toyota 2JZ-GTE

Fri, 3 Mar 2023 07:51:39 GMT

Kelford Camshaft Set, Toyota 2JZ-GTE
Buy Now: $909.95

Tech Notes:

All camshafts must be installed by a professional, who can check piston to valve clearances and valve seal clearances.

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Kelford Camshaft Set, Toyota 1JZ-GTE VVTi

Fri, 3 Mar 2023 07:40:50 GMT

Kelford Camshaft Set, Toyota 1JZ-GTE VVTi
Buy Now: $909.95

Tech Notes:

All camshafts must be installed by a professional, who can check piston to valve clearances and valve seal clearances.

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Kelford Camshaft Set, Toyota 1JZ-GTE

Fri, 3 Mar 2023 07:18:29 GMT

Kelford Camshaft Set, Toyota 1JZ-GTE
Buy Now: $909.95

Tech Notes:

All camshafts must be installed by a professional, who can check piston to valve clearances and valve seal clearances.

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Kelford Camshaft Set, BMW/Toyota B58 Gen 2

Thu, 19 Jan 2023 10:13:55 GMT

Kelford Camshaft Set, BMW/Toyota B58 Gen 2
Buy Now: $1,694.95

Tech Notes:

All camshafts must be installed by a professional, who can check piston to valve clearances and valve seal clearances.

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VAC Motorsports Adjustable Cam Gear Service, BMW S14/S38

Wed, 29 Dec 2021 13:01:15 GMT

VAC Motorsports Adjustable Cam Gear Service, BMW S14/S38
Buy Now: $249.95

*** Requires Customer to Provide Cam Gears for Alteration ***

For easy, accurate, repeatable, and reliable adjustment, send VAC Motorsports your existing S14 Cam Gears. Using high precision CNC machining, we modify your cam gears to be slotted, like our VAC Motorsports Adjustable Cam Gears. Slotted Cam Gears allow for the precise advancement or retardment of timing increments through the timing cover.

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