1972 Stock weight breaks

DeuceCoupe · 01-10-2021, 02:43 PM

1972 was a strange year.
SUPER Stock breaks were the same 1970-74:
SS/A=6.00
SS/B=6.50
etc
SS/H=9.50
The rules were pretty steady too AFAIK.

For STOCK, 1972 went back to almost pure stock so the rules were very different from 1971.
A/S=9.00
B/S=10.00
C/S=11.00
etc
M/S=21.00
N/S=22.00
O/S=24.00
P/S=26.00
Complicating things were that the 1972 new cars had ONLY NET ratings, not gross and not gross and net like many 1971 cars had.
All of the NHRA breaks & factoring up to 1972 was based on GROSS HP so it was a big dilemma what to do with NET HP - and how to run eg a 330hp GROSS 1971 car against a 270hp NET 1972 car when it might well be the exact same car & engine.

I dont know exactly what they did. From today's excel files for 1972, it looks like most of the 1972 "net" ratings were factored UP by NHRA to a guess at those engines "GROSS" ratings. Messy.

So you'd have to know what car/engine you have & what exactly NHRA did to factor that engine - in 1972 race year.

01-10-2021, 02:43 PM	#2
DeuceCoupe Member Join Date: Feb 2016 Posts: 274 Likes: 98 Liked 48 Times in 44 Posts	Re: 1972 Stock weight breaks 1972 was a strange year. SUPER Stock breaks were the same 1970-74: SS/A=6.00 SS/B=6.50 etc SS/H=9.50 The rules were pretty steady too AFAIK. For STOCK, 1972 went back to almost pure stock so the rules were very different from 1971. A/S=9.00 B/S=10.00 C/S=11.00 etc M/S=21.00 N/S=22.00 O/S=24.00 P/S=26.00 Complicating things were that the 1972 new cars had ONLY NET ratings, not gross and not gross and net like many 1971 cars had. All of the NHRA breaks & factoring up to 1972 was based on GROSS HP so it was a big dilemma what to do with NET HP - and how to run eg a 330hp GROSS 1971 car against a 270hp NET 1972 car when it might well be the exact same car & engine. I dont know exactly what they did. From today's excel files for 1972, it looks like most of the 1972 "net" ratings were factored UP by NHRA to a guess at those engines "GROSS" ratings. Messy. So you'd have to know what car/engine you have & what exactly NHRA did to factor that engine - in 1972 race year.