Hi All,

I'm looking to change the camshaft in my 1969 firebird, Rebuilt 455 8.9:1, stock rods, 5 C heads ,4 tube header,350 trans ,2000 stall, cast intake 750 VS. Camshaft that is currently in the engine is a 217/221 272/278 .454/.454 106. This was my choice with a 2.56 ratio. I had the rear end rebuilt and switched to 3.55 gears and thought there would be a better cam selection to go with since the gear change. After getting some advice I think I will go with a Crower grind. Is there a difference between the 60919 and 60242? I was thinking on going with the 60242 because of the avd.dur being larger. Any guidance or recommendations would be appreciated.