Re: gt class question
 

SS factor for the Chevy II/NOVA 327 is 307 for OEM. 67 327 GT is as you stated 295 OEM/304 replacement.

Traditional SS factors for 327 275 in a Camaro versus a Chevy II are different.

Re: gt class question
 

Thanks for the information Jeremy The car is a wagon if it makes any difference Sorry I should have stated that If any difference please let me know I’m trying to understand this

Re: gt class question
 

Yes it does change things. Not sure wagons are eligible to run SS GT.

Re: gt class question
 

Jeremy I found a picture of Greg Luneack nova wagon with gt/ha and ss/ka on the window

Re: gt class question
 

66 Chevy II Wagon was available as a 2-door, which is a requirement for GT. Check the weight and go from there.

Re: gt class question
 

Yes it does list station wagons in the rule book

Re: gt class question
 

Station wagon shipping weight is 3062. The heaviest auto gas V8 is the 327/275. It has a SS rating of 307 and a GT rating of 295 with OEM heads. I don't know which to use. Classification weight is figured without factoring in driver weight.

Quotes are from the 2019 GT Weight section. Math is mine and not under warranty....

"Shipping weight will be determined by using the power to weight factor of the vehicle with the heaviest gasoline engine and appropriate transmission"

3062/327 = 9.36 lbs per hp.

"..and multiplying the factor times the horsepower or performance rating"

9.36 x 295 = 2761 (pick one)
9.36 x 307 = 2874

"The proper class weight will then be determined by dividing this figure by the horsepower or performance rating of the engine used. Class is determined without driver weight."

2761/295 = 9.36
2874/307 = 9.36

GT/GA 9.00=9.49 lbs per NHRA factored HP

"Shipping weight of vehicle may be adjusted a maximum of 250
pounds to fit car in class."

+250 =3011 = 10.2 NHRA factor GT/IA 10.0-10.49
-250 =2511 = 8.5 NHRA factor GT/FA 8.5-8.99


EDIT


Indexes
GT/GA 10.40
GT/IA 10.65
GT/FA 10.25

Re: gt class question
 

Why did you divide shipping wt by 327?

Re: gt class question
 

3062- 250= 2812÷ 295= 9.53 pw factor LIGHTEST
3062+250= 3312÷ 295= 11.23 pw factor heaviest

GT/HA is 9.50 to 9.99 pw factor. This would be the lightest class he could run. CAN NOT GO TO BOTTOM OF CLASS THOUGH.

GT/KA is 11.00 to 11.49 pw factor this would be the heaviest class he could run.

GT/HA min 2980 index 10.50
GT/IA MIN 3120 INDEX 10.65
GT/JA min 3265 index 10.80
GT/KA min 3415 index 10.90

GT/JA still seems like best choice for ya. Add 25lbs from your SS/IA MIN WT & GET a tenth in index.

Cool car by the way. Don't see very many 327 Wagons running SS/IA.

Re: gt class question
 

Because I screwed up. The weight calculations should be:
3062/275 = 11.13 X 295 = 3284


An11.13 weight to hp factor and a 3284 shipping weight.


I will correct my post.