Re: GT clarification
 

I believe, for GT classes, you take "the shipping weight of the car with the heaviest gasoline V-8 engine available".

As for hoods, if the engine used came available with ram-air, the car can use it in GT. Otherwise, no, or hood must be blocked off.

Example A: 1995 Firebird with 2000 LS-1 engine for, say, GT/BA. Ram-air is OK.
Example B: '95 Firebird with '76 Corvette 350. Flat hood, or scoops must be blocked.

So, a '68 Firebird could use dual '68 ram air hood in Example A, but not Example B (or blocked off).

Not sure about same year car/engine. I've seen racers claim a '95 Camaro/'95 LT-1 in SS/IA as a '96 Camaro/'95 LT-1 and run GT/FA.

Re: GT clarification
 

thanks Mike!

Re: GT clarification
 

In regular SS such as a ss/ia 66 chevy II 327/275 combo the hp rating for oem heads is 307 and replacement heads is 304. Does this make sense? jason

Re: GT clarification
 

I would imagine the OEM head got hit via the AHFS, whereas the replacement head did not. Just a guess.

Re: GT clarification
 

Auto 307
Stick 299

As stated before aftermarket head hasn't been hit yet.

Re: GT clarification
 

thanks that makes sense. thanks jason