OK - a little history on Big Black first:
1992.5, N/A 7.3, ZF5, 3.55's, 242k miles, OE IP (never timed), new stanadyne 'E' injectors @ 220k miles.
Amsoil A/F, 3" true dual straightpipes, new AL pyro (thermocouple is about 1.5" from manifold),.
about a month ago, our own Dsl_Dog_Catcher (Ron...