Get your hands on RESTORER (Spring '94); front and back cover are one continuous photo of a '67 small block engine stamp pad, at about 8x magnification. John Amgwert used a Pentax 6 x 7 view camera so that we could all enjoy. Not sure if those with the CD version getthe same detail. The broach marks are subtle; if you weren't told what to look for, you'd miss them. IMO, these are quite fine lines; many mid-60's small and big blocks I've examined (non-Corvettes = not messed with) are more pronounced.