What index will my 72 be in?

Your car should fall around G, H and I/CM with a 300hp Magnum crate motor. Maybe F/CM if shipping weight is light enough in the guide. Basically you can add or subtract weight to go up or down one class from the "natural" class it falls into. If I remember correctly, indexes are I = 12.15, H = 12.00, G = 11.85, F = 11.70.

IHRA has the HP factored to 325 on the 360/300 Magnum. My 360/300 Commando is factored to 320HP. The 360/380HP Magnum is defactored to 370, I believe. But it is still not a good combo in the faster classes & indexes it would run against.

You'll need to do a lot of research because it's harder than most people think to make a car in Stock run under the index.


I just double-checked the class indexes and they appear to have been lowered .05 for crate motor combos!

http://www.nitrojam.com/downloads/pdf/competition/stock_indexes.pdf