GT Rulebook Amendments

Adub464Q · 12-06-2022, 11:47 AM

"Reserved for foreign and domestic factory-production coupes, sedans, sports cars, convertibles, or station wagons with any production V-8 engine of the same make. Year of engine optional, engine/body platform combinations that fit base Super Stock not eligible. Only those engines and/or bodies listed in the Official NHRA Stock Car Classification Guide are eligible for competition. Also see WEIGHT. Cars will be classified using the class weight break multiplied by the horsepower or performance rating of the engine used. Minimum weight with driver: 2,670 pounds."

Nick Heath · 12-06-2022, 01:50 PM

Seems like a reasonable idea, but where exactly is the line drawn and how exactly will this be enforced?

I can't run a LT1 in my GT/xx 1998 Firebird because it's in the 1998 class guide as an SS/xx. OK, makes sense.

I can't run a LS1 in my GT/xx 1999 Firebird because it's in the 1999 class guide as an SS/xx. OK, makes sense.

Can I run a 1998 LT1 in my GT/xx 1999 Firebird because there's no LT1 in a 1999 Firebird?

If so, isn't this the sort of thing people were doing anyway? And if not, where do you draw the line?

442OLDS · 12-06-2022, 06:46 PM

I'm really surprised there hasn't been more discussion or questions on this.
Could you run a low compression 1972 Oldsmobile 455 in a 1970 body?
What exactly are they saying if someone claims a different year car vs engine?
Who is this rule affecting the most?

Mike Mans · 12-06-2022, 06:47 PM

Quote:

Originally Posted by Nick Heath

Seems like a reasonable idea, but where exactly is the line drawn and how exactly will this be enforced?

I can't run a LT1 in my GT/xx 1998 Firebird because it's in the 1998 class guide as an SS/xx. OK, makes sense.

I can't run a LS1 in my GT/xx 1999 Firebird because it's in the 1999 class guide as an SS/xx. OK, makes sense.

Can I run a 1998 LT1 in my GT/xx 1999 Firebird because there's no LT1 in a 1999 Firebird?

If so, isn't this the sort of thing people were doing anyway? And if not, where do you draw the line?

You're spot on, there are some very popular body combinations that can be claimed as many different years to avoid the intended rule. I'm curious what controls they are putting in place for this rule to be effective.

Tom Meyer · 12-06-2022, 11:24 PM

How about this one 1966 Chevy 283/220. GT rated 233, Nova 233, Big cars 229, Chevelle 217 all different platforms but same engine specs. Tom

CMcAllister · 12-08-2022, 01:55 PM

Combinations where a simple carb/intake change changes the year of the engine?

'68 - '71 or even '73 Darts/Dusters with 340s?

Or is a different year spec engine all that is required to go to GT?

Mike Pearson · 12-08-2022, 02:06 PM

The way I interpret the rule is if the engine in your car is correct to run a specific super stock class then it cannot run GT. Some change would have to be done for it to be legal in GT. Carb change, Different heads etc.

LE WILSON · 12-08-2022, 07:50 PM

I agree with what Mike said. I have a 1964 Chevy ll with a 283, a natural K or L car in regular SS therefore can’t run that combo in GT/M or N any more. What’s unfortunate with that is the stick hp rating is 7 hp less in GT.

J Gower · 12-08-2022, 09:53 PM

Larry, NHRA just took 283-237 down to 230

Tom Meyer · 12-09-2022, 12:16 AM

NHRA just took 283-237 down to 230 This stick cars in a Chevy II only Autos is 233. Chevelle with a stick is still 227, Auto is 217. SS/J K L M is a 1# weight break, where do the GT classes go 1/2# breaks? Tom

12-06-2022, 11:47 AM	#1
Adub464Q Member Join Date: Mar 2010 Posts: 209 Likes: 35 Liked 372 Times in 73 Posts	GT Rulebook Amendments "Reserved for foreign and domestic factory-production coupes, sedans, sports cars, convertibles, or station wagons with any production V-8 engine of the same make. Year of engine optional, engine/body platform combinations that fit base Super Stock not eligible. Only those engines and/or bodies listed in the Official NHRA Stock Car Classification Guide are eligible for competition. Also see WEIGHT. Cars will be classified using the class weight break multiplied by the horsepower or performance rating of the engine used. Minimum weight with driver: 2,670 pounds." __________________ Austin Williams 3 SG 464Q STK SC

12-06-2022, 01:50 PM	#2
Nick Heath Member Join Date: Sep 2010 Location: Jersey Shore Posts: 332 Likes: 1,351 Liked 497 Times in 114 Posts	Re: GT Rulebook Amendments Seems like a reasonable idea, but where exactly is the line drawn and how exactly will this be enforced? I can't run a LT1 in my GT/xx 1998 Firebird because it's in the 1998 class guide as an SS/xx. OK, makes sense. I can't run a LS1 in my GT/xx 1999 Firebird because it's in the 1999 class guide as an SS/xx. OK, makes sense. Can I run a 1998 LT1 in my GT/xx 1999 Firebird because there's no LT1 in a 1999 Firebird? If so, isn't this the sort of thing people were doing anyway? And if not, where do you draw the line?

12-06-2022, 06:46 PM	#3
442OLDS VIP Member Join Date: Sep 2004 Location: Elgin,IL Posts: 1,333 Likes: 5 Liked 262 Times in 100 Posts	Re: GT Rulebook Amendments I'm really surprised there hasn't been more discussion or questions on this. Could you run a low compression 1972 Oldsmobile 455 in a 1970 body? What exactly are they saying if someone claims a different year car vs engine? Who is this rule affecting the most?

12-06-2022, 11:24 PM	#5
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 900 Likes: 51 Liked 301 Times in 105 Posts	Re: GT Rulebook Amendments How about this one 1966 Chevy 283/220. GT rated 233, Nova 233, Big cars 229, Chevelle 217 all different platforms but same engine specs. Tom __________________ Tom Meyer 5240 SS Stock ???

12-08-2022, 01:55 PM	#6
CMcAllister Senior Member Join Date: Sep 2006 Location: Fulton County, PA Posts: 533 Likes: 9 Liked 745 Times in 206 Posts	Re: GT Rulebook Amendments Combinations where a simple carb/intake change changes the year of the engine? '68 - '71 or even '73 Darts/Dusters with 340s? Or is a different year spec engine all that is required to go to GT?

12-08-2022, 02:06 PM	#7
Mike Pearson VIP Member Join Date: Mar 2007 Posts: 2,320 Likes: 546 Liked 1,629 Times in 502 Posts	Re: GT Rulebook Amendments The way I interpret the rule is if the engine in your car is correct to run a specific super stock class then it cannot run GT. Some change would have to be done for it to be legal in GT. Carb change, Different heads etc. __________________ Mike Pearson 2485 SS

12-08-2022, 07:50 PM	#8
LE WILSON Junior Member Join Date: Feb 2007 Posts: 21 Likes: 0 Liked 0 Times in 0 Posts	Re: GT Rulebook Amendments I agree with what Mike said. I have a 1964 Chevy ll with a 283, a natural K or L car in regular SS therefore can’t run that combo in GT/M or N any more. What’s unfortunate with that is the stick hp rating is 7 hp less in GT.

12-08-2022, 09:53 PM	#9
J Gower Member Join Date: Mar 2006 Location: Leitchfield, Ky. Posts: 129 Likes: 19 Liked 19 Times in 7 Posts	Re: GT Rulebook Amendments Larry, NHRA just took 283-237 down to 230

12-09-2022, 12:16 AM	#10
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 900 Likes: 51 Liked 301 Times in 105 Posts	Re: GT Rulebook Amendments NHRA just took 283-237 down to 230 This stick cars in a Chevy II only Autos is 233. Chevelle with a stick is still 227, Auto is 217. SS/J K L M is a 1# weight break, where do the GT classes go 1/2# breaks? Tom __________________ Tom Meyer 5240 SS Stock ??? Last edited by Tom Meyer; 12-09-2022 at 12:27 AM.