3.622" Stroke, Group 1 Rods LS Engine Crankshaft Scraper-BLEMISHED

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****BLEMISHED UNIT: Minor scratches and scuffs where it was test fitted.****

Part # EGM-331-BLMS

****BLEMISHED UNIT: Minor scratches and scuffs where it was test fitted.****


Improved Racing's crankshaft scrapers help reduce oil starvation by closely contouring the crankshaft and rods to remove excess oil, ensuring oil is quickly returned to the bottom of the sump. Crank scrapers also help reduce parasitic drag and windage losses caused by excess oil on the crank, which reduces rotational mass and results in dyno-proven gains of 5-10 HP at the wheels.

These scrapers are CNC-machined from 0.190" thick, 6061-T6 billet aluminum. The crankshaft scraper kits also include an aluminum windage tray that is 10% lighter, 70% stronger, and provides more clearance for aftermarket rods than the factory windage tray. The included windage tray bolts directly to the scraper with self-clinching lock nuts instead of the main cap studs, allowing it to be installed without disturbing the scraper alignment.

The crankshaft scrapers and windage trays were designed in CAD software using actual GM part models, prototyped, and test-fitted for a completely bolt-on fit in every listed application. The factory oil pump pickup tube is kept in the factory location with no compromises or modifications required.

Crank Scraper kits are compatible with factory or ARP main cap studs. Reducer spacers as well as Class 10, flanged zinc-plated steel distorted thread lock nuts are included for use with factory main cap studs. For ARP main cap studs, use the nuts supplied by ARP.

Features and Benefits

  • Guaranteed to increase horsepower by up to 10 WHP
  • Reduces oil starvation and aeration
  • 100% bolt-on installation
  • Contributes over 1.6 lbs (0.73 kg) in weight reduction
  • Includes reducer bushings and upgraded main cap stud lock nuts for factory studs
  • Lifetime Warranty
  • Made in the USA


  • CNC-machined aluminum crank scraper
  • Flanged, locking scraper-to-main cap stud mounting nuts (for use with factory studs only)
  • 4 x reducer bushings for centering the scraper when using factory main cap studs

Technical Specifications

  • Material: 6061-T6 aluminum
  • Weight: 1.12-1.23 lbs (0.51-0.56 kg) (complete assembly)


Please use the crankshaft scraper application table to select the correct part number for your application.

Part #
Primary Material
6061-T6 aluminum
Clears Crankshaft Stroke
Clears Connecting Rods
Group 1 (Most H-Beam Rods)
Eagle CRS6125BLW
K1 012AE25610
All H-Beam Rods
All H-Beam Rods
Most Other Brand H-Beam Rods Not Listed in Group 2
All H-Beam Rods
Thompson Motorsports
All H-Beam Rods
Improved Racing
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