Gn1 heads any good???

[MCH86GN]

I have been running gn1s since 2009. The first set was one of the very first made. I ran into the 9s with them, other than the exhaust guides breaking, i had no issues. The set I have now have been on the car since 2010 and they are the latest casting. No issues running 8s.

That's good to hear. My initial goal is to run low 10s and I probably won't go much faster than that. Being that I will be running a 109 block with forged internals, steel mains caps, roller cam, etc. I currently have a set of Champion Irons on the motor in my car, but I wanted to drive my car this summer and I'm not 100% sure that my irons will both be reusable so I bit the bullet and my engine builder got a new set of GN1s.