Originally posted by XA coupe
the cam was supposed to be a stock XA GT cam.. it was breathing mods like extractors and the holley that gave it the extra grunt
"When it became apparant the Phase IV was stillborn some of the smarties at FoMoCo decided to tip the hot parts already produced into regular Gts. This option was called RPO83"
780 Holley had a manual choke - idle 800, fast idle 2800. 8000rpm tacho, extractors (same as phase 111) modyfied sump (with baffles) and in some cases - Rear discs (from the LTD)
That info is from my magazine "History of the Falcon GT"
hope it helps