1970 Dodge Dart 318 upgrades

I have cam doc info for all the factory cams
however the only two I have access right now are a couple of DC cams including the Early (evidently) DC 260
I also have the Moon and Jones Cams
here is a little more data for the DCR guys
From Melling site
SPD 25 360 single pattern cam- intake and exhaust the same (this year)
22 76 62 37 278
-7 29 31 -9 203
29 31 intensity .004< .050 opening sides intake and exhaust
49 46 - intensity .050 >004 negative- closing sides

SPD 22 340 360 HP
20 79 79 30 279/289
-8 37 46 -6 209/220
28 33 intensity .004< .050 opening sides
42 36 - intensity .050 >004

SPD 20 318
12 72 57 38 264/275
-20 20 24 -12 180/192
32 33 intensity .004< .050 opening sides
52 50 - intensity .050 >004

you can add the intake and exhaust separately to get total lobe intensity for in and ex
Jones [email protected] [email protected] total intensity Opening + closing 62 120@200
DC 260 [email protected] [email protected] total intensity 72 115@200
but jones holds to 50 % more duration at .275 just below the centerlines

SPD 11 B/RB
22 74 74 39 284/293
-7 33 40 -11 206/209
29 34 intensity .004< .050 opening sides
41 50 - intensity .050 >004 closing sides

SPD 31 B/RB HP/Magnum
26 96 83 61 302/324
-6 39 50 -5 213/225
32 33 intensity .004< .050 opening sides intake and exhaust
63 66 - intensity .050 >004 closing sides

I put intake closed @.004 in bold
does not take much to see the excessive large intensities especially on the closing sides
This affects Dynamic compression on the intake and exhaust gas reversion on the exhaust
you can also see why advancing these cams may help apparent torque but really hurts the overlap/ reversion problem and causes more heat in the exhaust- as if that's possible
realtively speaking you can compare with the comp lobe catalog but comp uses some non stated numbers for their "intensities" show as (total) Intake exhaust)
most likely .006 and as has been shown elsewhere there can be a big difference between MOPAR, 006 and 004
IMHO you do not start to build compression till the valve is fully closed
the flow stalls then reverses if it is open even a tiny bit (piston is coming up- compression is almost trapped and is increasing rapidly
you can get exhaust torching with slow exhaust opening
etc