Product Summary

Universal Fit, 0.5" Overall Thickness, Phenolic

  • Fits Holley 4150/4160 bolt pattern
  • Phenolic construction reduces heat transfer and increases power
  • Spacers lengthen the intake plenum increasing its volume, and speeding up flow

Key Specs

MFG. Part #1351900
BrandSpeedway Motors

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Phenolic material is a type of plastic resin which has excellent insulating properties, so it will keep the fuel in your 4 barrel Holley 4150/4160 cooler for more power.
  • Fits Holley 4150/4160 bolt pattern
  • 1/2" tall
  • Open design
  • Phenolic construction reduces heat transfer and increases power

CARB Warning

For race/ off road use or for use on pre-1966 vehicles.

Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway, or if installed in vehicles model-year 1965 or older; motorcycles model-year 1977 or older; or off-highway recreational vehicles (such as off-road motorcycles and all-terrain vehicles) model-year 1996 and older. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.


MFG. Part #1351900
BrandSpeedway Motors
Overall Thickness0.5"
Inside Length3.55"
Bolt Hole Pattern5.63" x 5.16"
Gasket(s) IncludedNo
Hardware IncludedNo
Material TypePhenolic
Sold in QuantityEach
NotesIncludes dowel pins.
Carburetor Spacer StyleOpen
Carburetor Flange Type4-Barrel Square Bore