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Vehicle Info NeededCOMP CAMSPART NUMBER: 249-21-249-4
Comp Cams Magnum Mechanical Flat Tappet Camshafts
$30995
Ships on 10/19/2026
Lowest Price GuaranteeChrysler 383-440 C.I. 8 CYL. 1959-1980
- Magnum 306S Mechanical Flat Tappet Camshaft
(Single Bolt)
Lift .555"/.555"
Duration 306°/306°
Lobe Separation Angle: 110°
RPM Range 3500-6500
Serious Street / Strip effort for 440. 3500 converter. 10.5:1 and up comp. 800-850 CFM. 383 requires 4000 converter. 800 to 850 CFM, 10.5 compression.
| Operating Range: | 3500-6500 RPM |
| Duration Advertised: | 306° Intake / 306° Exhaust |
| Duration @ .050' Lift: | 260° Intake / 260° Exhaust |
| Valve Lift: | .555' Intake / .555' Exhaust |
| Lobe Separation Angle: | 110° |
273, 360, 318, AMC, Dodge, Mopar, Plymouth, Dart, Road Runner, Charger, Challenger, 383, 400, 440, 426, HEMI, 426 Wedge, 426 HEMI, RB, B, HEMI, 392, Chrysler, LA
Serious street/strip effort for 440. 3500 converter. 10.5:1+ compression. 800-850 CFM. 383 requires 4000+ converter.
Emissions Note:
This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.
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Part TypeCamshaft
BrandCOMP CAMS
Package Height2.75
Package Width3.0
Package Length24.5
Weight9.12 PG
Part CategoryPerformance Parts
Exh. Duration @ .050 In. (Deg)260
Cam StyleMechanical flat tappet
Grind NumberCRB 306S-10
Exh. Duration Advertised (Deg)306
Engine Make/SizeMopar 383-440
Intake Valve Lift With Factory Rocker Arm Ratio (I0.555
Int. Duration @ .050 In. (Deg)260
Basic Operating Rpm Range3,500-6,500
Intake Valve Lash0.022 in (0.559 mm)
Intake Valve Lift0.555 in (14.097 mm)
Computer-Controlled CompatibleNo
Int. Duration Advertised (Deg)306
Lobe Separation (Deg)110
Rpm Range3500-6500
Advertised Duration306 int./306 exh.
Exhaust Valve Lift With Factory Rocker Arm Ratio (0.555
UsageStreet/Strip
Valve Lift With Factory Rocker Arm Ratio0.555 int./0.555 exh.
Camshaft Gear Attachment1-bolt
QuantitySold individually
Exhaust Valve Lash0.022 in (0.559 mm)
Exhaust Valve Lift0.555 in (14.097 mm)
Advertised Intake Duration306
Intake Duration At 050 Inch Lift262
Exhaust Duration At 050 Inch Lift262
Advertised Exhaust Duration306
Lifter TypeMechanical Flat Tappet
Part FitmentSemi Universal
Duration At 050 Inch Lift262 int./262 exh.
Valve Springs RequiredYes
Vendor Part Number21-249-4
Package Qty1
Package TypeEA
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