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Supertech Performance BMEVI-1031S Inconel Exhaust Valve +1mm Oversize Single Groove

(BMW X5 2001-06, 328i 1996-2000, M3 1994-99, X3 2004-06, Z4 2003-05, Z3 1996-2002, 325i 1992-95, 2001-05, 330i 2001-05, 528i 1997-2000 + 17 more models)

Manufacturer

Picture for manufacturer Supertech Performance

Part Number

BMEVI-1031S
7 reviews
Sale Price

$37.96

Estimated ship date Thursday, November 26

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Product Details

The Supertech Performance BMEVI-1031S is a high-performance Inconel exhaust valve engineered for BMW engines requiring a +1mm oversize (31.50mm head diameter) replacement. Built from Inconel 751 nickel-base alloy, this exhaust valve is specifically designed to handle the extreme heat demands of high-performance, turbocharged, and supercharged applications where standard stainless steel valves fall short.

Supertech's Inconel alloy construction delivers superior heat resistance at elevated exhaust temperatures, maintaining material integrity where conventional valves would degrade. The single-groove design is compatible with keeper KPR-6S/7 (sold separately).

Valve Specifications:

  • Head Diameter: 31.50mm (+1.0mm oversize)
  • Stem Diameter: 5.96mm
  • Overall Length: 105.65mm (4.158 in)
  • Material: Inconel 751 Nickel-Base Alloy
  • Valve Type: Exhaust
  • Groove Type: Single Groove
  • Compatible Keeper: KPR-6S/7 (sold separately)

Black Nitride Coating Benefits:

  • Microhardness exceeds stainless steel base material (800HV minimum) while retaining ductility beneath the nitrided layer
  • Smoother surface finish than chrome-stemmed valves, reducing friction between stem and guide
  • Valve seat surface is harder, improving longevity when used with lead-free fuels, alcohols, nitro, and other aggressive fuel blends
  • Compatible with nodular iron, steel powder metal, hard aluminum-copper, and beryllium copper seats
  • Nitrided layer is bonded at a microscopic level and will not flake or crack under impact

Supertech exhaust valves are sold individually (per valve). Order the quantity equal to the number of exhaust valves your engine requires.

Products specifications

Fits

BMW X5 2001-06, 328i 1996-2000, M3 1994-99, X3 2004-06, Z4 2003-05, Z3 1996-2002, 325i 1992-95, 2001-05, 330i 2001-05, 528i 1997-2000, 330Ci 2001-06, 530i 2001-05, 320i 2001-05, 325Ci 2001-06, 325xi 2001-05, 525i 1989-95, 2001-05 + 11 more models

Head Dia

31.50mm (+1.0)

Length

105.65mm

Material

Inconel

Stem Dia

5.96mm

Order 12486. Item was simple to find and the website made it very easy to navigate. I appreciated the ability to pay with paypal and email notifications gave me confidence that everything was taken care of properly.

shipment came on time, and was nicely wrapped.

Just received my order! I placed the order Sunday night and received it on Tuesday, super fast shipping! The SS vent caps look great and arrived in perfect condition. Thanks!

Very nice people very considerate and helpful plus the price was nice

I ordered the part from Autoplicity and it arrived in time and is a great product<br>

Return customer with a few more future purchases in mind...best price plus quick shipping means these guys are just that good!

Very smooth ordering and processing. Great communications.

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