LATE MODEL STOCK RULES :

Refer to the 2023 NASCAR Rulebook for anything other than general info listed below. 

GENERAL: 

ENGINE, TOTAL WT // RIGHT SIDE WT CARBURETOR               

GM 604 Crate, 3050 lbs // 1350 lbs                          650 CFM, 1” open spacer

GM “Upgrade”, 3100 lbs // 1400 lbs                          390 CFM, 1” tapered spacer

GM “Harrington Enforcer”, 3100 lbs // 1400 lbs    650 CFM, 1” open spacer

Ford 347 SR Crate, 3100 lbs // 1400 lbs                   650 CFM, no spacer