gt class question - Page 2

JeremyDuncan · 12-22-2019, 03:19 PM

Quote:

Originally Posted by FireSale

Then you are probably right. Where did you see 307 as the GT factor? I found 304.

Only drag racers split hairs over 3 HP and 39 lbs......

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.

jaf2021 · 12-22-2019, 05:03 PM

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

JeremyDuncan · 12-22-2019, 05:18 PM

Quote:

Originally Posted by jaf2021

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

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

jaf2021 · 12-22-2019, 06:44 PM

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

FireSale · 12-22-2019, 06:53 PM

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

jaf2021 · 12-22-2019, 07:02 PM

Yes it does list station wagons in the rule book

FireSale · 12-22-2019, 07:48 PM

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

JeremyDuncan · 12-22-2019, 09:14 PM

Quote:

Originally Posted by FireSale

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

Why did you divide shipping wt by 327?

JeremyDuncan · 12-22-2019, 09:27 PM

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.

FireSale · 12-22-2019, 09:56 PM

Quote:

Originally Posted by JeremyDuncan

Why did you divide shipping wt by 327?

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.

12-22-2019, 05:03 PM	#12
jaf2021 Member Join Date: Oct 2004 Location: selmer,tn Posts: 111 Likes: 13 Liked 5 Times in 5 Posts	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

12-22-2019, 06:44 PM	#14
jaf2021 Member Join Date: Oct 2004 Location: selmer,tn Posts: 111 Likes: 13 Liked 5 Times in 5 Posts	Re: gt class question Jeremy I found a picture of Greg Luneack nova wagon with gt/ha and ss/ka on the window

12-22-2019, 06:53 PM	#15
FireSale VIP Member Join Date: Feb 2014 Location: Lakewood Washington Posts: 1,407 Likes: 29 Liked 237 Times in 126 Posts	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. __________________ Dale Shearon 68 Mustang 6394

12-22-2019, 07:02 PM	#16
jaf2021 Member Join Date: Oct 2004 Location: selmer,tn Posts: 111 Likes: 13 Liked 5 Times in 5 Posts	Re: gt class question Yes it does list station wagons in the rule book

12-22-2019, 07:48 PM	#17
FireSale VIP Member Join Date: Feb 2014 Location: Lakewood Washington Posts: 1,407 Likes: 29 Liked 237 Times in 126 Posts	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 __________________ Dale Shearon 68 Mustang 6394 Last edited by FireSale; 12-22-2019 at 07:57 PM.

12-22-2019, 09:27 PM	#19
JeremyDuncan Member Join Date: Apr 2010 Posts: 264 Likes: 1,174 Liked 354 Times in 79 Posts	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.

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