head bolt bulge in runner?

All small block 340/360 heads are similar in port shape from the factory, for production use. 273/318 heads are similar in port shape but in a smaller version. The 318 heads above were 120 cc's on the intake runner and the 915's were 167 cc's, the 318/302s started at 118cc's and the 915's started at 150 cc's.