Inliners International Forums General Discussion Bench racing Ethanol, E85 for fuel ???

Are you talking about the photo showing the Bolt for the Lump?? If so It has 194 valves That have Not been unshrouded.
No you DO NOT want to dish that area. that is what is known as the Quench area This is where Your compression comes into play the Most. Also That Area Is not as think as one may think.
If you Look at photo #6 You can see what Happened to the head when it ws MILLEd to thin and OVER Heated.