Too much gear?
Made it to the track with new MP 557/296 solid cam in my 340, advanced 4 degrees when I degreed it in, stock replacement pistons, X heads with some bowl clean up. Last summer at the track with the old cam, MP 508/280 solid, 4.10 rear gear and 27 inch tires, it ran 13.40's @ 102 with full exhaust, just like I drive it on the street. It usually picks up .3-.4 and 104-105 mph with open headers. The new cam and 4.56 gear with full exhaust it ran 13.55 @ only 98mph? Trapping at little over 6000 rpm. I also put an A/F meter in to help with getting the jetting right, that showed 12.5-13.02 through all the runs. Is it possible I am just reving right through the power and I need a 4.10 or 3.91 gear? It also ran the same 60 foot as the old cam. As a side note, I won the trophy class, made me feel a little better.
Made it to the track with new MP 557/296 solid cam in my 340, advanced 4 degrees when I degreed it in, stock replacement pistons, X heads with some bowl clean up. Last summer at the track with the old cam, MP 508/280 solid, 4.10 rear gear and 27 inch tires, it ran 13.40's @ 102 with full exhaust, just like I drive it on the street. It usually picks up .3-.4 and 104-105 mph with open headers. The new cam and 4.56 gear with full exhaust it ran 13.55 @ only 98mph? Trapping at little over 6000 rpm. I also put an A/F meter in to help with getting the jetting right, that showed 12.5-13.02 through all the runs. Is it possible I am just reving right through the power and I need a 4.10 or 3.91 gear? It also ran the same 60 foot as the old cam. As a side note, I won the trophy class, made me feel a little better.
