They are.
Chrysler's durations are tied to the ramp change on engineering drawings. @Wyrmrider helped establish that we need to use Camcraft and similar catalogs to get close to a duration at a lift.
Wyrmrider wrote:
"Chrysler has a unique yet consistent way of measuring duration. They take the blueprint point where the clearance ramp meets the acceleration ramp and add 4 degrees to the opening and 4 degrees to the close."
from what cam shaft are you running on the street
and
"340 HP CAM here you can compare MOPAR duration which is close to .008 with .004 data"
I think here .008 is at the valve, and am pretty sure .004 is SAE and therefore .006 at the valve for 1.5:1 rockers.
When I plugged those durations into Dynomation (which has to use .006 at valve), the hp and torque curves looked much closer to published dyno tests. 340 cam specs?
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Here's some 340, and 360 4bbl cam part numbers..
Chrysler
2899205 1968 Manual Transmission
2899206 1968 Automatic Transmission,1969-1975 340 & 360 with 4bbl
4214671 (1974- 1976 360 E58 package internet info. 360 Stock Cam Spec's.?)
4041998 1976-80 360 w/ 4bbl [E58 ?] in Shepard.
Other Chrysler LA HP/4bbl hydraulic FT cams almost certainly different:
4227879 1980-1987 318 4 bbl [E46 or E48? & Police pkg?]
4042000 1976 -79 360HP [Calif ? E56?]