I got tired of seeing my stupid lid question at the top so let's try something new.
What cam and heads are you running in your Vette and seen as how not everyone out there runs a LS1 you better put what motor it's in as well.
I personally have a Texas Speed cam 232/234 .595/.598 113LSA in and LS1 with Ported 243 heads from Advanced Induction with PAC springs.