what kind of power increase

[malibuick231]

What kind of power increase sould I get going to gn1 heads with the other mods listed below. Thanks for your input.

 

[John Purdom]

GN1

Be aware that many people have reported problems with porosity in the aluminum used in the GN1's. This problem may be fixed by now, but I would research it before buying them.

Also, TA Performance is releasing a new aluminum head in Jan that sounds very promising. They told me that the price should be around $ 1095 complete. http://www.taperformance.com/