The 7cc myth.....

66fs said
So what's the difference in weight between tulip or nail head valves?

A good question as weight lowers peak RPM for valve float.

I found 2 cc's in the dimple's in the valves of our 675 heads off of a '68 273. More 'anti-compression' in the cylinders....

Soooo, does anyone have a 4 valve relief, low compression 318 piston to measure the volume in those reliefs?