E3 Spark Plugs Pro Mod Drag Racing Series Presented by J&A Services Competitors,

In order to maintain parity in the class, the NHRA has made the following rule amendments which are effective immediately:

SECTION 6: E3 SPARK PLUGS NHRA PRO MOD DRAG RACING SERIES PRESENTED BY J&A SERVICE, DESIGNATION (Page 1) (6/15/2021) (8/11/2021)

PM, preceded by car number. Classes of competition within Pro Modified are for supercharged, methanol-burning, turbocharged methanol or gasoline-burning, or nitrous-assisted, gasoline-burning full-bodied cars.

Minimum weight at the conclusion of run, including driver:

Nitrous-assisted entries (910 cid) - 2,515 2,500 pounds

Nitrous-assisted entries (960 cid) - 2,565 2,550 pounds

Roots supercharged entries (526 cid) - 2,615 2,640 pounds

Centrifugal supercharged entries (526 cid) - 2,615 2,685 2,735 pounds

Turbocharged entries (526 cid) - 2,665 2,615 pounds

Nostalgia body styles (1937-1938 Chevy, 1941 Willys, 1953 Studebaker, 1953-1962 Corvette and 1955-1957 Chevy and Buick) may deduct 50 pounds from minimum weight.

NHRA reserves the right to amend rules as performance dictates. Any competitor who causes an oildown while participating at an NHRA Camping World event will be subject to fines and penalties as outlined in Section 2 – Oildown Penalties

SECTION 6: E3 SPARK PLUGS NHRA PRO MOD DRAG RACING SERIES PRESENTED BY J&A SERVICE, ENGINE: 1, INDUCTION (Page 2) (8/11/2021)

Any number and type of carburetors or throttle bodies may be used. Electronic fuel injection permitted. For centrifugally supercharged and turbocharged applications, fuel injectors must be placed in either the intake manifold runner or intake manifold plenum. Auxiliary injectors placed in any other location prohibited. EFI entries must have an NHRA accepted ECU, software and firmware. Centrifugally supercharged applications must utilize the most recent version of NHRA Approved Centrifugal FuelTech firmware and software to control all EFI related functions. Centrifugal supercharged applications are limited to 10,000 rpm maximum rev limiter. A current list of NHRA-accepted ECUs, software, and firmware can be found on NHRARacer.com. See General Regulations 9:1, 9:11.

Note: The 4.73 Fuel Tech software change for NHRA Pro Mod centrifugal will have a 10,000 rpm rev limit.  Other NHRA (PM) ECU’s are welcome to request software acceptance for Pro Mod Centrifugal parameters.

SECTION 6: E3 SPARK PLUGS NHRA PRO MOD DRAG RACING SERIES PRESENTED BY J&A SERVICE, DRIVETRAIN: 2, REAR END (Page 4) (8/11/2021)

Aftermarket full-floating axle assembly mandatory. Aftermarket axles with minimum 5/8-inch-diameter studs and axle-retention device mandatory. Maximum (numeric) rear-end gear ratio 4.57- to-1 for roots supercharged and turbocharged entries. Centrifugally supercharged maximum (numeric) rear-end gear ratio 4.29- to- 1. See General Regulations 2:11.

SECTION 6: E3 SPARK PLUGS NHRA PRO MOD DRAG RACING SERIES PRESENTED BY J&A SERVICE, DRIVETRAIN: 2, TRANSMISSION (4TH Paragraph) (Page 5) (2/2/2021) (7/6/2021) (8/11/2021)

Lockup converters are prohibited on supercharged and turbocharged combinations. Lockup converters are permitted on nitrous-assisted combinations. Overdrive units are prohibited on all combinations. A 1-to-1 relationship is mandatory in high gear for all transmission types. Automated, electric, or automated pneumatic shifting devices prohibited permitted on all transmission types; When utilizing automated shifting, a minimum time of 0.6 seconds must be used between shifts for any 3 speed and 0.4 seconds for any 5 speed transmission. Automated shifting may also utilize preset engine RPM functions in addition to this time requirement. must be controlled by preset engine rpm and/or time functions only. Each individual shift must be a function of the driver and controlled manually. Iterative transmission staging device permitted on converter cars. Manipulation of transmission or converter pressure or volume other than at the starting line is prohibited. Pressure manipulation control must be disarmed upon the release of the transbrake or any other device used when launching the vehicle. See General Regulations 2:12, 2:13, 2:14.