"special high performance" 360?

In that case, the -3 simply means the mold for the block had been repaired 3 times........


Case in point, Original marine blocks, had no dash, original HD truck blocks, never went past 5..........

But the dash really doesn't mean anything, I have seen -14's that were beautiful, and -2's that had casting lines actually running up into the bottom of the cylinder.

6-21-76 is when it was made, then, after that, there will be a arrow with a clock, or 3 dots, pointing to the time of day, shift, or something.... (No issue really, just kept track of the riff raff blocks)