# 3.5: Five- or Six-Point Harnesses: Five- or six-point harnesses mandatory, including fifth or fifth/sixth "anti-submarine" belt. All harnesses must be SFI or FIA approved; dated within four years of the race; and properly mounted.
o 3.5.1: Harness Mounting: Grade 8 or better hardware and 3-inch or larger load washers are required when mounting to sheetmetal. Shoulder harnesses should be within 15 degrees of horizontal from load point to seat entry.
o 3.5.2: Anti-submarine belt(s) should be mounted vertically. If this requires cutting a hole in the seat squab, don't route the belt(s) in a way that allows them to fray on a seat spring. If vertical mounting is impractical, the mounting point should be located behind, not ahead of, the belt buckle.
I don't know that the harness rule has really changed. It has just been inspected and enforced more in recent races.
Aside from the angle of the harness bars, their proximity to the seat has also been a problem.
I have seen a lot where the harness bar is so close to the seat the buckle loop things are not behind the seat and they failed tech.
So the bar needs to be at the right angle and as well as a proper length from the
seat.
On the 240Z, I think we kinda got lucky. With the driver in the seat our shoulder straps don't usually touch the seat or barely touch the seat.
The driver's shoulder height in relation to the cut outs in the seat is what it is and some guys fit better than others too.
Troy
#35 LRE
1973 Datsun 240Z