Tell me what the limits of the stock heads and cam are. In terms of power capabilities.

For instance...if I do everything possible to open up breathing (intake, exhaust, etc.) ... what kind of hp/torque numbers are possible? Also, what would be the best rear gear to run with that combination going through a 700R4?

How much can be gained by porting the stock heads?

 

I don't have any numbers to share, but after hogging the snot out of my L98 heads it breathes alot better.I probably gained 500 or 600 RPMs and best of all if you do it yourself it's a FREE MOD!!!