Eric's cam challenge

Bewy said

Sorry, do not agree. The 050 numbers tell you the duration at 050 tappet lift. It tells you nothing else about the lobe.
Here is an example, two lobes:
- 233 @ 050/ 143 @ 200 lift/ 0.312 lobe lift
- 234 @ 050/152 @ 200/0.328 lobe lift

Click to expand...

I don't think one member here said the duration @.050" tells You everything about a lobe, not one. 2 profiles w/the same advertised checking tappet lift, be it .006,.010, or .015", will still indicate the more aggressive of the 2 in initial ramp speed @.050", the very next place anybody who knows' eyes go is the lobe lift#'s. If You've stared at enough lobe profiles, then You know that it only takes 1-3° difference @.050" to make large difference in the profile up top, even if the lobe lifts are the same.
To what NT is stating, We don't waste Our time cutting good seats & lapping them so We can pretend that they work .015" off the seat, they don't. If they ain't seated, they ain't sealed. And if they ain't sealed, they're not building pressure, or preventing reversion. So the REAL seat-to-seat matters, regardless of the adv. or @.050" #'s, although in an all-out drag rig it can mean less unless it's a big difference....but to the avg. gearhead here, it matters.