Classification Information:

All your calculations are done for the natural classification plus the one class up and one class down that the car is allowed to compete by adjusting the weight of the car.
The OEM shipping weight is shown in the header, plus the actual calculated car weight and race weight for each class are also displayed.
1/4 mile and 1/8 mile indexes for each of the noted classes are displayed.
Use the buttons at the bottom of the page to see the engine blueprint specs or to see classification options for this car in Super Stock GT classes.
If you have any idea for additional information here that can be helpful to class racers, please submit to Technical Submission.

1970 Plymouth Valiant Duster Coupe 2 Dr with 275 HP 340 Cu In Engine

Shipping Weight: 3109 lbs Wheelbase: 108"

Stock Classes HPFactor: 299 Power/Weight Factor: 10.39

	Stock Classes	Class Min Wgt	Over/Under Shipping Wgt	Min Wgt w/Driver	1/4 Mile Man Index	1/4 Mile Auto Index	1/8 Mile Man Index	1/8 Mile Auto Index
Lightened Class	D/S and D/SA - 9.50 Lb/HP	2841	-269	3011	11.50	11.55	7.39	7.42
Natural Class	E/S and E/SA - 10.00 Lb/HP	2990	-119	3160	11.65	11.70	7.47	7.50
Weighted Class	F/S and F/SA - 10.50 Lb/HP	3140	31	3310	11.80	11.85	7.57	7.60

Stock Classes w/Replacement Heads HPFactor: 297 Power/Weight Factor: 10.40
Edelbrock #60197 for Stock or SS, Edelbrock #70767 & MPP P5001740 for SS

	Stock Classes	Class Min Wgt	Over/Under Shipping Wgt	Min Wgt w/Driver	1/4 Mile Man Index	1/4 Mile Auto Index	1/8 Mile Man Index	1/8 Mile Auto Index
Lightened Classes	D/S and D/SA - 9.50 Lb/HP	2822	-288	2992	11.50	11.55	7.39	7.42
Natural Classes	E/S and E/SA - 10.00 Lb/HP	2970	-139	3140	11.65	11.70	7.47	7.50
Weighted Classes	F/S and F/SA - 10.50 Lb/HP	3119	10	3289	11.80	11.85	7.57	7.60

Super Stock Classes HPFactor: 281 Power/Weight Factor: 11.06

	Super Stock Classes	Class Min Wgt	Over/Under Shipping Wgt	Min Wgt w/Driver	1/4 Mile Man Index	1/4 Mile Auto Index	1/8 Mile Man Index	1/8 Mile Auto Index
Lightened Classes	SS/I and SS/IA - 10.00 Lb/HP	2810	-299	2980	10.55	10.70	6.83	6.91
Natural Classes	SS/J and SS/JA - 11.00 Lb/HP	3091	-18	3261	10.80	11.00	6.98	7.10
Weighted Classes	SS/K and SS/KA - 12.00 Lb/HP	3372	263	3542	11.00	11.25	7.10	7.24

S/S Classes w/Replacement Heads HPFactor: 286 Power/Weight Factor: 11.06
Edelbrock #60197 for Stock or SS, Edelbrock #70767 & MPP P5001740 for SS

	Super Stock Classes	Class Min Wgt	Over/Under Shipping Wgt	Min Wgt w/Driver	1/4 Mile Man Index	1/4 Mile Auto Index	1/8 Mile Man Index	1/8 Mile Auto Index
Lightened Classes	SS/I and SS/IA - 10.00 Lb/HP	2860	-249	3030	10.55	10.70	6.83	6.91
Natural Classes	SS/J and SS/JA - 11.00 Lb/HP	3146	37	3316	10.80	11.00	6.98	7.10
Weighted Classes	SS/K and SS/KA - 12.00 Lb/HP	3432	323	3602	11.00	11.25	7.10	7.24