[Adger Smith]

Put the head on the empty block and scribe the head in the area of the ex. Lay the head back to the cylinder wall and then scoop the quench area out on that side to direct the flow toward the ex port/valve. The spark plug tip needs to be at least .100 away from the piston when it is positioned @ approx 36-40 degrees before TDC. .035-.040 @ TDC. I've done this on a couple of SS engines as well as shifted the heads with offset dowels (intake toward the center of the cylinder) and seen over .010 in ET & some MPH improvement .