340 cam specs?

Here's what I get for a stock 340.
4.04" Bore, 3.13" stroke, 6.13" rod.
Using: 279* Intake Duration, 112 Installed Centerline
Intake Closing Angle (after bdc) 71.5*
Using Static compression ratio of 10.0:1.
Effective stroke is 2.24 inches.
Your dynamic compression ratio is 7.44:1 .
Your dynamic cranking pressure is 146.05 PSI.
Your effective boost compression ratio, reflecting static c.r., cam timing, altitude of 500' is 7.34 :1.
V/P (Volume to Pressure Index) is 101

same stock 340.
4.04" Bore, 3.13" stroke, 6.13" rod.
Using: 268* Intake Duration, 112 Installed Centerline
Intake Closing Angle (after bdc) 66*
Static compression ratio of 10.0:1.
Effective stroke is 2.37 inches.
Your dynamic compression ratio is 7.81:1 .
Your dynamic cranking pressure is 155.82 PSI.
Your effective boost compression ratio, reflecting static c.r., cam timing, altitude of 500' is 7.71 :1.
V/P (Volume to Pressure Index) is 114

So that's the difference between using the Chrysler advertised duration and the .004 seat to seat duration.


Stock 340 with less compression.
Using: 279* Intake Duration, 112 Installed Centerline
Using Static compression ratio of 9.0:1.
Effective stroke is 2.24 inches.
Your dynamic compression ratio is 6.73:1 .
Your dynamic cranking pressure is 127.58 PSI.
Your effective boost compression ratio, reflecting static c.r., cam timing, and altitude of 500' is 6.63 :1.
V/P (Volume to Pressure Index) is 88