I assume you mean it went from 352 to 375? Your post says 252 to 275.
Ron usually keeps the revs down on the first pull. I'll bet that he ran the engine higher in RPM on the second pull, and that's where the extra HP came from. But, I don't know; do you still have the data to see the RPM figures? A jump of 23 HP from only a two degree timing increase is really wild!
Jay Brown
1968 Shelby GT 500 Convertible, all aluminum 489" 1030 HP Supercharged FE
1969 XL Convertible, 460
1969 R code Mach 1, 706 HP 511" all aluminum FE, 10.457 @ 127.47, 2005 Drag Week Winner, Naturally Aspirated Big Block
