Originally Posted by Adger Smith (Post 90151)

Looks like the 327 275 has been gifted with HP. (NHRA.com) The 1966 275 is now at 299 HP with OE heads & 304 HP w replacement heads. The 327 300 HP is at 285 w OE heads & 290 W Replacement heads. Might make the 300 a better choice, depending on the differences in the engine combos. If you know the shipping weight of the heavy car you want to use you can use Bill's GT calculator to figure out what classes it will fit. You have to know 3 things to figure the class w/GT calculator. 1. Shipping weight of the car you want to use. You can get the factory shipping weight from the NHRA classification guide. http://www.nhra.com/tech_specs/classification/ 2. The factored HP of the engine. (get the same place) 3. Either Auto or Man. The program works. It even gives you choices of which classes you can move to by adding or subtracting weight & the HP required to run. Pretty nice tool.

Originally Posted by jmcarter (Post 453386)

Dwight, you've been commended on other threads for this great tool and in my futile attempt to find a traditional SS car within my budget I have started to get more serious about making it a GT class car in order to use some of my inventory. The tool you created is absolutely phenomenal in terms of time savings for the racer looking to find a good competitive GT combo. Thanks!!!

Originally Posted by Dwight Southerland (Post 453401)

Gee thanks, Jim! I'm humbled by the complement.

Originally Posted by Dwight Southerland (Post 453383)

To calculate GT combinations:

1) Go to www.classracerinfo.com
2) Register as a member if you have not done it already
3) Go to link for Technical Tools
4) Select NHRA Classification Tool

5) Select your car year-model (1971 Plymouth, 1987 Camaro, etc) from the drop down boxes

6) Click on the specific make-model-engine combination from the classification page (looks like an NHRA class guide page)

7) You will see Stock-Super Stock classfication information. At the bottom of that classification information page is a button titled "GT Classes". Click on it.

8) Select the engine you want to use from the list that is displayed and click on the button "Classify"

9) Ta-dah! All the GT classifications with weights, classes and indexes for each eligible classes.

http://i39.photobucket.com/albums/e2...ps4561a8cf.jpg