Cylinder Heads: Stock compression on the 3.4 is 9.25 to 1. The Northstar V-8 has a compression ratio of 10.25 to 1. Why does that matter? Because wither you know it or not the Northstar V-8 shares the exact same pistons and rods that the 3.4 use's. So bumping the 3.4 to 10.25 to 1 is safe. Ram Air Tech can modify your 3.4 DOHC heads for $1095.00. This includes new valves, 3 angle valve job, intake and exhaust porting and deshrouding the combustion chamber. After all that you will see around a 22HP increase.
For more information you can contact Ram Air Tech at 714-901-9101 or visit their website at www.RamAirTech.com.