[Jerryl]

Originally Posted by Turbo1dr

Since you don't see this kind of stuff posted too much I figured I'd show what a full race ported GN1-R head (out the box) looks like when compared to stock iron heads. This gives people an idea of how much larger aftermarket heads are. I ported the stock iron head you see myself and has been a best of 6.53 at 107 in the 8th mile. Also to note, my "R" heads are not the tall port offered by Champion. There's at least 3/16" or more to make the port taller. I'm sure all the really fast guys have MUCH larger re-worked heads than these.

Ported heads question
Here is a dumb question. (Hope I did not miss it in the thread)
It appears that the plug is more towards the center in the GNR’s vs the stock heads.

Is this an illusion or does do the GNR’s use a difference casting?
Welded stock heads possibly?

Also, it appears that the squish is noticeably improved.
Is this a TTA head casting?

GREAT THREAD!!!