what is the biggest cam i can put in my cars?

I have a 04 GTO and a 02 Trans Am. Both vehicles have stock heads. Both vehicles have full SLP exhaust packages, and Cold Air intakes. so with these parts what is the largest lift and duration cam i can put in them, i want a good lope without having to change any components on the heads.

Texas Speed & Performance
Magic Stick 4 cam
239/242 with 112 LSA

TSP has spent a lot of time finding the biggest cam for a stock motor.. on a stock motor this cam is meant to pick up 60hp.. the magic stick 3 the MS4s predecessor could net you 55hp.. but after a little more fine tuning the MS4 came about so enjoy having a nasty cam

Trans Am Collector Edition Corsa Exhaust

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