Installing Custom Roller Cam per FABO reccomendations
FWIW
Here are those Crane hyd flat lobe profiles for around 268-270 advertised duration. The .842 min dia looks to be a bit crisper down to the close of the valves, but they both have some slow and fast ramps. The H218/306 and H212/306 look to be the best of the bunch and don't strike me as being all that different. .904 profile actually looks slower around the 'tails' of the ramps but faster from .200" tappet lift to full lift. Of course, this is not conclusive as to all that COULD be done with one or the other, and things may change with different tappet types, mfr's, etc.
Thanks wym. That is good to know... I noticed that the cam we used in my sons' 340 was a Z series which is listed as for a .842 min diameter lifter.... one of the 2 best of their profiles IMHO for around 268 adv duration for area under the curve for hyd flat profiles. Yes, on the .200" duration.... and I'll look at the Comp numbers too.
FWIW
Here are those Crane hyd flat lobe profiles for around 268-270 advertised duration. The .842 min dia looks to be a bit crisper down to the close of the valves, but they both have some slow and fast ramps. The H218/306 and H212/306 look to be the best of the bunch and don't strike me as being all that different. .904 profile actually looks slower around the 'tails' of the ramps but faster from .200" tappet lift to full lift. Of course, this is not conclusive as to all that COULD be done with one or the other, and things may change with different tappet types, mfr's, etc.
