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."

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?

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?

Re: GT Rulebook Amendments
 

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.

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

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?

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.

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.

Re: GT Rulebook Amendments
 

Larry, NHRA just took 283-237 down to 230

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