Yes we do naturally aspirated builds!!! In fact ECS the first to crack the 500 rwhp mark with a stock bottom Heads and Cam combination and one of the first to crack 600 rwhp with a NA 447 ci back in 2004. From the most basic cam package, to an all out race prepped motor ECS only uses the most proven parts to ensure reliability and power. Click here to see some of our proven NA combinations.