"Tech Papers" by panic

Chrysler Cam Data

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Chrysler Poly Performance

    The information on MP cams is calculated from the published data in Chrysler manuals and catalogs. Data on other manufacturers' cams is from their catalogs or contributed from owners.
    Duration @ .050” valve lift shown in the tables is 85% (.850) of nominal for high-performance cams, and 77.7% (.777) of nominal for OEM cams, per Chrysler. Duration @ .050” lift figures should only be used for comparison between MP cams. In some cases, more (potentially) accurate duration @ .050” figures appear as "Notes", with the source or author in parentheses.
    Cam timing figures listed are as installed on Chrysler-recommended centerlines. Cams may be installed in any position. Generally, advancing or retarding the cam rotates all cam events simultaneously in one direction. The event most affected by these changes is the intake valve closing point ABDC ("After Bottom Dead Center"). Advancing the cam closes the intake valve earlier, increasing cylinder pressure in the low to mid-range, and reducing peak power. Retarding the cam closes the intake valve later, which reduces low to mid-range power (and may reduce pinging), but potentially improves peak power.
    Lobe Separation Angle is fixed, and cannot be changed.
    In mechanical-lifter (solid & roller) cams slight adjustment can be made to Overlap & Total Duration by minor changes in valve lash. Non-standard lash settings are recommended for test purposes. Crane suggests +.004" & -.008" (adjusted from manufacturer's suggested hot settings) as maximum limits for continuous use.
    Increasing lash will increase cylinder pressure at low to mid-range speeds, close the intake valve sooner, and reduce Overlap & Total Duration. The effect is slightly similar to advancing the cam. Too much lash increases wear on all components, lowers maximum RPM, and increases the possibility of breakage.
    Reducing lash will do the opposite: reduced cylinder pressure at low to mid-range speeds, later intake valve closure, and increased Overlap & Total Duration. The effect is slightly similar to retarding the cam. Too little lash may result in a valve (especially an exhaust valve) not seating completely when the engine temperature rises (such as a full-throttle 1/4 mile pass).

Select Motor:
Slant 6
170, 198, 225
LA Small Block
273, 318, 340, 360
B & RB Big Block
350, 361, 383, 400, 413, 426W, 440
Hemi
426

Slant 6: 170, 198, 225

244° Mechanical: P4120243

Intake Duration, Nominal
244°
Exhaust Duration, Nominal
244°
Intake Duration @ .050
190°
Exhaust Duration @ .050”
190°
Intake Lobe Centerline
106° ATDC
Exhaust Lobe Centerline
110°BTDC
Lobe Separation Angle
108°
Overlap
28°
Intake Opens
16° BTDC
Exhaust Opens
52° BBDC
Intake Closes
48° ABDC
Exhaust Closes
12° ATDC
Intake Lift
.436"
Exhaust Lift
.436"
Note: as installed on 106° centerline per Chrysler

268° Mechanical: P4529342

Intake Duration, Nominal
268°
Exhaust Duration, Nominal
268°
Intake Duration @ .050
208°
Exhaust Duration @ .050”
208°
Intake Lobe Centerline
104° ATDC
Exhaust Lobe Centerline
108°BTDC
Lobe Separation Angle
106°
Overlap
56°
Intake Opens
30° BTDC
Exhaust Opens
62° BBDC
Intake Closes
58° ABDC
Exhaust Closes
26° ATDC
Intake Lift
.460”
Exhaust Lift
.460”
Note: as installed on 104° centerline per Chrysler

276° Mechanical: P4286681

Intake Duration, Nominal
276°
Exhaust Duration, Nominal
276°
Intake Duration @ .050
214°
Exhaust Duration @ .050”
214°
Intake Lobe Centerline
104° ATDC
Exhaust Lobe Centerline
108°BTDC
Lobe Separation Angle
106°
Overlap
64°
Intake Opens
34° BTDC
Exhaust Opens
66° BBDC
Intake Closes
62° ABDC
Exhaust Closes
30° ATDC
Intake Lift
.490”
Exhaust Lift
.490”
Note: as installed on 104° centerline per Chrysler

284° Mechanical: P4529343

Intake Duration, Nominal
284°
Exhaust Duration, Nominal
284°
Intake Duration @ .050
221°
Exhaust Duration @ .050”
221°
Intake Lobe Centerline
102° ATDC
Exhaust Lobe Centerline
106°BTDC
Lobe Separation Angle
108°
Overlap
68°
Intake Opens
40° BTDC
Exhaust Opens
68° BBDC
Intake Closes
64° ABDC
Exhaust Closes
36° ATDC
Intake Lift
.528"
Exhaust Lift
.528"
Note: as installed on 102° centerline per Chrysler

LA Small Block: 273, 318, 340, 360

340 Stock Hydraulic: P4452782

Intake Duration, Nominal
268°
Exhaust Duration, Nominal
276°
Intake Duration @ .050”
208°
Exhaust Duration @ .050”
214°
Intake Lobe Centerline
112° ATDC
Exhaust Lobe Centerline
116° BTDC
Lobe Separation Angle
114°
Overlap
44°
Intake Opens
22° BTDC
Exhaust Opens
74° BBDC
Intake Closes
66° ABDC
Exhaust Closes
22° ATDC
Intake Lift
.429"
Exhaust Lift
.444"
Note: original standard-shift high-performance 340 4bbl. cam
Note: as installed on 112° centerline per Chrysler

268°/272° Hydraulic: P4452761

Intake Duration, Nominal
268°
Exhaust Duration, Nominal
272°
Intake Duration @ .050”
228°
Exhaust Duration @ .050”
231°
Intake Lobe Centerline
108° ATDC
Exhaust Lobe Centerline
112° BTDC
Lobe Separation Angle
110°
Overlap
50°
Intake Opens
26° BTDC
Exhaust Opens
68° BBDC
Intake Closes
62° ABDC
Exhaust Closes
24° ATDC
Intake Lift
.450”
Exhaust Lift
.455"
Note: as installed on 108° centerline per Chrysler

280° Hydraulic: P4452992

Intake Duration, Nominal
280°
Exhaust Duration, Nominal
280°
Intake Duration @ .050”
238°
Exhaust Duration @ .050”
238°
Intake Lobe Centerline
106° ATDC
Exhaust Lobe Centerline
114° BTDC
Lobe Separation Angle
110°
Overlap
60°
Intake Opens
34° BTDC
Exhaust Opens
74° BBDC
Intake Closes
66° ABDC
Exhaust Closes
26° ATDC
Intake Lift
.474"
Exhaust Lift
.474"
Note: as installed on 106° centerline per Chrysler

284° Hydraulic: P4120231

Intake Duration, Nominal

284°

Exhaust Duration, Nominal

284°

Intake Duration @ .050”
241°
Exhaust Duration @ .050”
241°
Intake Lobe Centerline
108° ATDC
Exhaust Lobe Centerline
108° BTDC
Lobe Separation Angle
108°
Overlap
68°
Intake Opens
34° BTDC
Exhaust Opens
70° BBDC
Intake Closes
70° ABDC
Exhaust Closes
34° ATDC
Intake Lift
.484"
Exhaust Lift
.484"
Note: as installed on 108° centerline per Chrysler

292° Hydraulic: P4120233

Intake Duration, Nominal
292°
Exhaust Duration, Nominal
292°
Intake Duration @ .050”
248°
Exhaust Duration @ .050”
248°
Intake Lobe Centerline
108° ATDC
Exhaust Lobe Centerline
108° BTDC
Lobe Separation Angle
108°
Overlap
76°
Intake Opens
38° BTDC
Exhaust Opens
74° BBDC
Intake Closes
74° ABDC
Exhaust Closes
38° ATDC
Intake Lift
.508"
Exhaust Lift
.508"
Note: 242° @ .050” (Herb McCandless)
Note: as installed on 108° centerline per Chrysler

276° Mechanical: P4529346

Intake Duration, Nominal
276°
Exhaust Duration, Nominal
276°
Intake Duration @ .050”
235°
Exhaust Duration @ .050”
235°
Intake Lobe Centerline
110° ATDC
Exhaust Lobe Centerline
114° BTDC
Lobe Separation Angle
112°
Overlap
52°
Intake Opens
28° BTDC
Exhaust Opens
72° BBDC
Intake Closes
68° ABDC
Exhaust Closes
24° ATDC
Intake Lift
.490”
Exhaust Lift
.490”
Note: as installed on 110° centerline per Chrysler

284° Mechanical: P4120653

Intake Duration, Nominal
284°
Exhaust Duration, Nominal
284°
Intake Duration @ .050”
241°
Exhaust Duration @.050”
241°
Intake Lobe Centerline
110° ATDC
Exhaust Lobe Centerline
114° BTDC
Lobe Separation Angle
112°
Overlap
60°
Intake Opens
32° BTDC
Exhaust Opens
76° BBDC
Intake Closes
72° ABDC
Exhaust Closes
28°ATDC
Intake Lift
.528"
Exhaust Lift
.528"
Note: as installed on 110° centerline per Chrysler

296° Mechanical: P4120655

Duration Intake Nominal
296°
Duration Exhaust Nominal
296°
Duration Intake @ .050”
252°
Duration Exhaust @ .050”
252°
Intake Lobe Centerline
108° ATDC
Exhaust Lobe Centerline
112° BTDC
Lobe Separation Angle
110°
Overlap
76°
Intake Opens
40° BTDC
Exhaust Opens
80° BBDC
Intake Closes
76° ABDC
Exhaust Closes
36° ATDC
Intake Lift
.557"
Exhaust Lift
.557"
Note: as installed on 108° centerline per Chrysler

312° Mechanical: P4120657

Duration Intake Nominal
312°
Duration Exhaust Nominal
312°
Duration Intake @ .050”
265°
Duration Exhaust @ .050”
265°
Intake Lobe Centerline
104° ATDC
Exhaust Lobe Centerline
108° BTDC
Lobe Separation Angle
106°
Overlap
100°
Intake Opens
52° BTDC
Exhaust Opens
84° BBDC
Intake Closes
80° ABDC
Exhaust Closes
48° ATDC
Intake Lift
.590”
Exhaust Lift
.590”
Note: catalog data appears incorrect - shows impossible figure (104°) for overlap
Note: as installed on 104° centerline per Chrysler

B & RB Big Block: 350, 361, 383, 400, 413, 426W, 440

440: Stock Hydraulic P4452783

Intake Duration, Nominal
268°
Exhaust Duration, Nominal
284°
Intake Duration @ .050”
208°
Exhaust Duration @ .050”
221°
Intake Lobe Centerline
113° ATDC
Exhaust Lobe Centerline
117° BTDC
Lobe Separation Angle
115°
Overlap
46°
Intake Opens
21° BTDC
Exhaust Opens
79° BBDC
Intake Closes
67° ABDC
Exhaust Closes
25° ATDC
Intake Lift
.450”
Exhaust Lift
.458"
Note: original 440, Commando, 383 Magnum etc. high-performance cam
Note: 208/220° @ .050” (R. Karkashian)
Note: as installed on 113° centerline per Chrysler

272° Hydraulic: P4286677

Intake Duration, Nominal
272°
Exhaust Duration, Nominal
272°
Intake Duration @ .050”
231°
Exhaust Duration @ .050”
231°
Intake Lobe Centerline
110° ATDC
Exhaust Lobe Centerline
114° BTDC
Lobe Separation Angle
112°
Overlap
48°
Intake Opens
26° BTDC
Exhaust Opens
70° BBDC
Intake Closes
66° ABDC
Exhaust Closes
22° ATDC
Intake Lift
.455"
Exhaust Lift
.455"
Note: 222° @ .050” (Brad H)
Note: as installed on 110° centerline per Chrysler

280° Hydraulic: P4452993

Intake Duration, Nominal
280°
Exhaust Duration, Nominal
280°
Intake Duration @ .050”
238°
Exhaust Duration @ .050”
238°
Intake Lobe Centerline
106° ATDC
Exhaust Lobe Centerline
114° BTDC
Lobe Separation Angle
110°
Overlap
60°
Intake Opens
34° BTDC
Exhaust Opens
74° BBDC
Intake Closes
66° ABDC
Exhaust Closes
26° ATDC
Intake Lift
.474"
Exhaust Lift
.474"
Note: as installed on 106° centerline per Chrysler

284° Hydraulic: P4120235

Intake Duration, Nominal
284°
Exhaust Duration, Nominal
284°
Intake Duration @ .050”
241°
Exhaust Duration @ .050”
241°
Intake Lobe Centerline
108° ATDC
Exhaust Lobe Centerline
108° BTDC
Lobe Separation Angle
108°
Overlap
68°
Intake Opens
34° BTDC
Exhaust Opens
70° BBDC
Intake Closes
70° ABDC
Exhaust Closes
34° ATDC
Intake Lift
.484"
Exhaust Lift
.484"
Note: as installed on 108° centerline per Chrysler

292° Hydraulic: P4120237

Intake Duration, Nominal
292°
Exhaust Duration, Nominal
292°
Intake Duration @ .050”
248°
Exhaust Duration @ .050”
248°
Intake Lobe Centerline
108° ATDC
Exhaust Lobe Centerline
108° BTDC
Lobe Separation Angle
108°
Overlap
76°
Intake Opens
38° BTDC
Exhaust Opens
74° BBDC
Intake Closes
74° ABDC
Exhaust Closes
38° ATDC
Intake Lift
.509"
Exhaust Lift
.509"
Note: 242° @ .050” (Herb McCandless)
Note: as installed on 108° centerline per Chrysler

284° Mechanical: P4120659

Intake Duration, Nominal
284°
Exhaust Duration, Nominal
284°
Intake Duration @ .050”
241°
Exhaust Duration @.050”
241°
Intake Lobe Centerline
110° ATDC
Exhaust Lobe Centerline
114° BTDC
Lobe Separation Angle
112°
Overlap
60°
Intake Opens
32° BTDC
Exhaust Opens
76° BBDC
Intake Closes
72° ABDC
Exhaust Closes
28°ATDC
Intake Lift
.528"
Exhaust Lift
.528"
Note: as installed on 110° centerline per Chrysler

296° Mechanical: P4120661

Duration Intake Nominal
296°
Duration Exhaust Nominal
296°
Duration Intake @ .050”
252°
Duration Exhaust @ .050”
252°
Intake Lobe Centerline
108° ATDC
Exhaust Lobe Centerline
112° BTDC
Lobe Separation Angle
110°
Overlap
76°
Intake Opens
40° BTDC
Exhaust Opens
80° BBDC
Intake Closes
76° ABDC
Exhaust Closes
36° ATDC
Intake Lift
.557"
Exhaust Lift
.557"
Note: as installed on 108° centerline per Chrysler

312° Mechanical: P4120663

Duration Intake Nominal
312°
Duration Exhaust Nominal
312°
Duration Intake @ .050”
265°
Duration Exhaust @ .050”
265°
Intake Lobe Centerline
104° ATDC
Exhaust Lobe Centerline
108° BTDC
Lobe Separation Angle
106°
Overlap
100°
Intake Opens
52° BTDC
Exhaust Opens
84° BBDC
Intake Closes
80° ABDC
Exhaust Closes
48° ATDC
Intake Lift
.590”
Exhaust Lift
.590”
Note: catalog data appears incorrect - shows impossible figure (104°) for overlap
Note: as installed on 104° centerline per Chrysler

282° Mechanical: Competition Cams

Duration Intake Nominal
282°
Duration Exhaust Nominal
282°
Duration Intake @ .050”
255°
Duration Exhaust @ .050”
255°
Intake Lobe Centerline
108° ATDC
Exhaust Lobe Centerline
108° BTDC
Lobe Separation Angle
108°
Overlap
66°
Intake Opens
33° BTDC
Exhaust Opens
69° BBDC
Intake Closes
69° ABDC
Exhaust Closes
33° ATDC
Intake Lift
.582"
Exhaust Lift
.582"
Note: data courtesy of rat roaster

Hemi: 426

278° Hydraulic: P4349259

Intake Duration, Nominal
278°
Exhaust Duration, Nominal
278°
Intake Duration @ .050”
236°
Exhaust Duration @ .050”
236°
Intake Lobe Centerline
104° ATDC
Exhaust Lobe Centerline
112° BTDC
Lobe Separation Angle
108°
Overlap
62°
Intake Opens
35° BTDC
Exhaust Opens
71° BBDC
Intake Closes
63° ABDC
Exhaust Closes
27° ATDC
Intake Lift
.495"
Exhaust Lift
.480”
Note: 228° @ .050” (R. Karkashian)
Note: as installed on 104° centerline per Chrysler

292° Hydraulic: P4349257

Intake Duration, Nominal
292°
Exhaust Duration, Nominal
292°
Intake Duration @ .050”
248°
Exhaust Duration @ .050”
248°
Intake Lobe Centerline
108° ATDC
Exhaust Lobe Centerline
108° BTDC
Lobe Separation Angle
108°
Overlap
76°
Intake Opens
38° BTDC
Exhaust Opens
74° BBDC
Intake Closes
74° ABDC
Exhaust Closes
38° ATDC
Intake Lift
.524"
Exhaust Lift
.507"
Note: 242° @ .050” (Herb McCandless)
Note: as installed on 108° centerline per Chrysler

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