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Ryck Campbell · 06-14-2011, 06:19 AM

Gentlemen,

SS/GT is a little different than SS in that there is no "natural" class for a GT car. You take the heaviest model of your choosing (in this case the heaviest GTS is the 440 @ 3229; there was no Hemi in a 1969 Dart according to the class guide).

You divide the shipping weight of the car chosen and divide that number by the horsepower of your engine. In this case it's the 1970 383 - 330/335 rerated to 304 with OEM heads. That number is 9.80. Since GT/DA is a 9.50 weight break, you would be running at a .30 per horsepower disadvantage in GT/DA @ 3145 instead of at the top of the class at 3055. This car can also run GT/EA @ 3210, GT/FA @ 3360 or GT/GA @ 3510.

I hope this clarifies the way to calculate SS/GT weights.

06-14-2011, 06:19 AM	#16
Ryck Campbell Junior Member Join Date: Dec 2001 Location: Rome, NY Posts: 56 Likes: 176 Liked 46 Times in 10 Posts	Re: Car classification ? Gentlemen, SS/GT is a little different than SS in that there is no "natural" class for a GT car. You take the heaviest model of your choosing (in this case the heaviest GTS is the 440 @ 3229; there was no Hemi in a 1969 Dart according to the class guide). You divide the shipping weight of the car chosen and divide that number by the horsepower of your engine. In this case it's the 1970 383 - 330/335 rerated to 304 with OEM heads. That number is 9.80. Since GT/DA is a 9.50 weight break, you would be running at a .30 per horsepower disadvantage in GT/DA @ 3145 instead of at the top of the class at 3055. This car can also run GT/EA @ 3210, GT/FA @ 3360 or GT/GA @ 3510. I hope this clarifies the way to calculate SS/GT weights. __________________ Ryck Campbell NHRA Technical Specialist