Modified Racing Series

  • 1
June In The Mountains

June In The Mountains

Join us Saturday, June for at White Mountain Motorsports Park for the Asphalt Small Block Modified and Modified Racing Series

engine rule change for 2021


Modified Racing Series

engine rule change for 2021

2021 Engine Rules Addendum
A. NASCAR Spec Engines must be sealed and meet all NASCAR specifications, this includes all carburetor specs.
B. All Aluminum Head Engines must use a NASCAR Legal Holly 390 CFM Model 4150 HP Series Carburetor with bridged boosters, boosters may be shortened to .500 inches, must meet Go & No-Go gauges.
*The exception to the above rule is the “Dart Budget Aluminum Head/Spec Engine Package” and the “Steel Head Engines” are allowed any size Holly Model 4150 HP Series Carburetor.
C. All Carburetors Must have booster’s safety wired.
D. Any Aluminum Head Engines will be allowed a single 2inch carburetor spacer only. There will be No stacking of carburetor spacers, as in two (2) into one (1).
E. Steel Engines must run a single 1inch carburetor spacer only. No stacking of carburetor spacers.
F. MRS Budget Spec Tri-Y Headers are allowed on all aluminum head engine packages.

Submitted By: William Doucette

Back to News

Latest Photos

Sunoco Race Fuel
Hoosier Racing Tires
Racing Electronics
Speedway Illustrated
Race Day CT
Area Auto Racing News
QA1 Shocks
Auto Meter
Sherwood Racing Wheels
Ironclad Performance Wear
Lu-Macs Package Store
New England Race Fuel
Tub O Towels
Capri Tools
Mod Squad Racing Media
32 Signs
Fyne Lyne Speed and Fab
Landrum Performance Springs
Hawk Performance
Quarter Master
The Racing Guys
Maurice Enterprises
Milton CAT