Product Description
BMW B58 Race Series Engine Build - ZNM Performance
ZNM Performance Race Series Engine Build Program
Introducing our BMW B58 engine program—crafted for enthusiasts who demand performance, precision, and reliability. At the heart of our program is a commitment to excellence, where every B58 engine is meticulously disassembled, inspected, and rebuilt using high-quality OEM or upgraded components.
The BMW B58 is one of the most impressive turbocharged inline-6 engines to come out of Munich in recent years. It delivers smooth power, strong midrange torque, and solid reliability in stock form. But like any performance platform, it has its limits—especially when pushed beyond factory specs. Known for its forged crankshaft and closed-deck design, the B58 handles moderate tuning well, but weaknesses like the factory pistons, rods, and cooling system can become problem areas under high boost or prolonged abuse.
That’s where our engine build program comes in. We tear each B58 down to the bare block, inspect all components, and rebuild it with upgraded forged internals, improved head sealing solutions, and optional enhancements like port injection or closed-deck reinforcement, depending on your power goals. Whether you’re planning a high-horsepower street car or a track-ready beast, our built B58 engines are designed to take the punishment and deliver consistent, reliable performance.
Our facility in Pompton Lakes, NJ builds engines for customers across the U.S. and internationally. Please inquire about international shipping options.
Key Features and Options for Our Built B58 Engines
- Fire Ring head gasket setup for maximum sealing under high boost
- Block deck machined to accept stainless o-rings for added cylinder pressure control
- Optional block sleeving service available
- Choice of Darton sleeves or Italian Rod and Piston sleeves
- Built to handle high power reliably—ideal for aggressive street or track builds
Cylinder Head and Valvetrain Options Available for Your B58
- Complete cylinder head teardown, hot tank cleaning, and crack inspection
- Precision valve job and resurfacing for proper sealing and performance
- GSC or Kelford camshaft options, available in Stage 1, Stage 2, or Stage 3 profiles
- Upgraded titanium valve springs and retainers for high-RPM durability
- Performance valve guides for improved heat resistance and longevity
- Upgraded intake and exhaust valves for better flow and strength under boost
- Ideal for street builds, track use, or high-horsepower applications needing top-end reliability
Stroker Kits Available for Your B58
- Brian Crower 3.2L – Includes 4340 billet LW crank, 100mm stroke, BC Pro625+ rods (5.8281" c-to-c), and custom pistons
- Italian Rods & Pistons 3.2L Stroker Kit
Frequently Asked Questions (FAQ)
Q: Can the stock B58 engine handle high boost?
A: The stock B58 is strong thanks to its forged crankshaft and closed-deck design, but the factory pistons, rods, and head gasket can become failure points when running high boost for extended periods.
Q: Why should I sleeve my B58 block?
A: The B58 uses a thin LDS coating on its aluminum bores. Once compromised—even from a light hone—the block must be sleeved. Sleeving with ductile iron restores durability and allows for reliable use of forged pistons.
Q: What is a Fire Lock head gasket and when is it needed?
A: A Fire Lock (or fire ring) head gasket uses stainless o-rings machined into the block for added sealing strength. It’s essential for high-boost builds to prevent head lift and gasket failure.
Q: What cylinder head upgrades do you offer for the B58?
A: We offer full head teardown, crack inspection, precision valve jobs, and upgrades including GSC or Kelford cams, titanium springs and retainers, performance valve guides, and upgraded valves for both intake and exhaust.
Q: How much power can your Race Series B58 build handle?
A: Power potential depends on the selected components, but our sleeved, fire-locked, and forged internal builds are designed to handle 800 HP up to 1500 HP reliably with the right supporting mods.
