GN1 Aluminum Heads Question

[boostmaster]

I got an opportunity to buy a set of Champion GN1 Aluminum heads. How do I identify what casting I'm looking at? Also can I use stock style T&D rockers on them?

Thanks, Pete

 

[wickedtt]

Do they say GN1 on the side of them and what are the numbers on the intake side of the head? Can you post pics

 

[750H.P.V6]

If the logo is on the side of the head between the spark plug holes they are older castings. The newer heads have the logo on the end.

Neal

 

[earcher1]

What are the differences between the old castings and the new ones? Are there pros or cons betwween them?

 

[dsapper]

only thing I'm aware of is that the new ones have more material on the bottom of the head to aid in clamping more.