Speedmaster Small block porting tips and results Part 1

MOPAROFFICIAL said
Put them on the block after its been finish honed to size...then scribe the bore to the head/chambers. Mark each head L&R So they go back on the same.
That's how you do it. You want it exact or a hair smaller than the bore...but definitely not bigger than the bore. Fyi most head gaskets are bigger , like 4.180 , than the 4-4.080 bores we use. And no, a ledge would disrupt and cause deflection into the path of the other air most near...and basically slow or crash the good air.=flows less n exhibits some turbulence perhaps

I grabbed these a while ago, to use on my 410 (.040” over bore) to get a little more cr, assuming they would work even though they are for bigger 340 bores. Curious about the DG logo, and what the compressed thickness would be. I’ve read they are .028” thick (mine still sealed) that’s it. Can you fill me in? Thanks