Refer to the 2024 NASCAR Rulebook.
GENERAL:
ENGINE, TOTAL WT // RIGHT SIDE WT CARBURETOR
GM 604 Crate, 3050 lbs // 1375 lbs HOLLEY 650 CFM, 1” open spacer
GM “Upgrade”, 3075 lbs // 1375 lbs HOLLEY 500 CFM-HP / ULTRA-HP/ ULTRA-XP, 1” tapered spacer
GM “Harrington Enforcer”, 3100 lbs // 1400 lbs HOLLEY 650 CFM, 1” open spacer
Ford 347 SR Crate, 3100 lbs // 1400 lbs HOLLEY 650 CFM, no spacer
** Chains or cables on the rear end to stop traveling when jacked up must be installed with bolt and lock nut. No quick release pins will be allowed. When jacking the car up, the frame must jack up a minimum of 2 inches before the tire clears. If not connected on both ends, it must be removed before you race.