NOS: Dry Nitrous Spacer Plate for Holley LS Hi-Ram EFI Intake Manifolds

These sandwich-style plates from NOS give you an easy way to add nitrous oxide to your Hi-Ram–equipped LS engine. Machined from billet 6061-T6 aluminum, these plates are anodized for great looks and excellent corrosion protection.

The one-piece design features machined passages that precisely spray into the center of each cylinder. Plate includes jetting for up to 250 HP but can support more than 1,000 HP. Includes a NOS plate, gasket, jet holders, and jets. Available in two finishes: Black (12535BNOS) or Silver (12535NOS).


  • Dry single-stage plate sandwiches between the bottom base and top plate on Holley Hi-Ram intake manifolds.
  • Designed specifically for optimum nitrous distribution on LS-based engines.
  • Sprays nitrous directly into each cylinder runner for proper nitrous distribution.
  • Features a machined 0.103” passage that feeds eight 0.040” openings per intake runner.
  • Billet 6061-T6 aluminum with laser-etched NOS
  • Anodized Black or Clear for corrosion resistance and a quality appearance.
  • Includes jetting for 50-, 100-, 150-, 200-, and 250-horsepower configurations.
  • Supports up to 1,000+ horsepower (jets purchased separately).
  • Includes plate, gasket, hardware, jet holders, and jetting for up to 250 horsepower.
  • Two finishes: Black or Silver.
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