gt class question

[Mike Pearson]

Originally Posted by JeremyDuncan

You do not have to claim a different year engine than body year. Also the 327 275 GT factor was lowered to 295.

Be careful figuring the class for GT. The shipping wt rules are different than traditional SS.

In your case since your running IA that your claiming 66 Nova SS to fit in SS/IA.

In GT you have to claim the heaviest engine shipping wt for your body style and transmission type. Your allowed to adjust the shipping wt 250 from this. In a 66 Nova SS the heaviest shipping wt engine combo is the 327 275hp combo at 2917lbs.

You are allowed to either subtract the 250lbs from this or add the 250lbs to the shipping wt to figure the classification.

So 2917lbs minus 250 is 2667lbs. *(You cannot adjust shipping wt below 2500). Take the 2667 ÷ by the GT HP factor of the engine being used which is 295. Which is 9.04 that gives you your power to weight factor and what's the lightest class you can run. Which is GT/GA in this case. Please note that unlike traditional SS you can not automatically go to the "bottom" of a class weight break just because it fits that class. GT/ GA is 9.00 to 9.49. so your min in GT/GA would be 9.04*295+170 driver wt. = 2941 adjusted down to nearest 5lbs scale weight or 2940.

To find the heaviest GT class you add the 250 to shipping wt and divide by GT HP of motor claimed Factor to get power to weight factor.

So 2917 + 250 ÷ 295= 10.73 power to weight factor. GT/JA is a 10.50 to 10.99 class and would be heaviest class your combo would fit.

Your min. Wt in GT/JA would be 10.5x 295+170= 3267. Round down to scale wt of 3265.

You can run also run any class between GT/GA to GT/JA.

I would think GT/JA would be a good choice for your car. You would only have to add 25lbs from your SS/IA min wt and go from a 10.70 to a 10.80 index.

SSIA minimum weight for 327/275/295 is 3120. At least that is what it is in my 68 Camaro. I have been running that for a few years. Not the best combo for sure but that is what I have right now. The 327 is harder to dial than the 350 was and falls off more in the heat.