THIS IS THE STYLE OF SPACER THEY WERE USING ON THE NATIONWIDE / XFINITY SERIES CARS TO CUT DOWN THE HORSEPOWER INSTEAD OF A RESTRICTOR PLATE. THIS IS NOT THE STYLE WHERE THE TAPER GETS LARGER AS IT ENTERS THE INTAKE.
ALLSTRA GOVERNOR ADJUSTABLE BASE PLATE 1" THICK 4-HOLES TAPERED INSERTS ALL26060
Allstar ALL56337, One Black Steel Insert 1/4In Tapered Performance Racing Parts
2" to 1? ? Stainless Tapered Standard Exhaust Reducer Connector Pipe Tube
1/2" Tapered Port Aluminum Carburetor Spacer Fits Holley AFB 4BBL
1" Thick Flat Aluminum Spacers With 1/2" Hole - 4 Pack #1141
00-49000 Nitrous Outlet 4150 Flange Billet Pressure Relief Burst Panel 1" Thick
