2" or 3" Belt Harness??

Charrlie_S said
I am not positive, so check the NHRA rules. I know if you are not required to run SFI belts, the date rule does not apply.
However I think if you upgrade to a roll bar/cage, then you must run SFI approved (3 inch) dated belts, even if the car does not require a cage, by ET.

I'll be DAMMED you are correct

Section 20, page 40:

A quick-release, 3-inch driver restraint system, with a 2-inch crotch
strap, meeting SFI Spec 16.1 is mandatory in all cars in competition
required by the rules to have a roll bar or a roll cage. (Permitted in
all other classes.) A 3-inch SFI Spec 16.5 driver restraint system is
also acceptable wherever an SFI Spec 16.1 is mandatory or
permitted. Driver restraint system must be clearly labeled as
meeting SFI Spec 16.1 and be dated by manufacturer. See Class
Requirements for additional requirements for Top Fuel and Funny
Car. SFI Spec 16.1 Y-type belts prohibited. (In cases where the
class does not require an SFI 16.1 driver restraint system, the twoyear
recertification does not apply.) System must be updated at
two-year intervals from date of manufacture. All seat-belt and
shoulder harness hardware must be originally designed to be used
with each other and produced by the same manufacturer. For
harness installation, see illustration. Cars using OEM or OEM-type
seat may route crotch strap in front of seat instead of through seat.
Only units that release all five attachment points in one motion are
permitted. When arm restraints are worn with a restraint system
that utilizes a latch lever, a protective cover must be installed to
prevent arm restraint from accidentally releasing the latch lever.
Protective cover not required if system utilizes duck-bill latch
hardware. All harness sections must be mounted to the frame,
crossmember, or reinforced mounting, and installed to limit drivers
body travel both upward and forward. Seat belts may not be
wrapped around lower framerails. Under no circumstances are bolts
inserted through belt webbing permitted for mounting. Check
manufacturers instructions.