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COMP Cams 20-232-4 - Comp Cams 'Magnum' Hydraulic Flat Tappet Camshafts

COMP Cams 20-232-4 - Comp Cams 'Magnum' Hydraulic Flat Tappet Camshafts

COMP Cams#249-20-232-4

Magnum 280H Hydraulic Flat Tappet Camshaft Only
Lift: .480''
Duration: 280°
RPM Range: 2500-6000
  • Fits Applications:
  • 1971-1972
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COMP Cams 20-232-4 - Comp Cams 'Magnum' Hydraulic Flat Tappet Camshafts Details

Chrysler 273-360ci Small Block 1964-2000

Note: The basic 273-360ci engines, produced since the mid-1960's, have remained relatively unchanged as far as the valve train is concerned. The 1964-91 engines used shaft type rocker arms which required some special changes in the camshaft design to allow oil to flow to the top of the engine and into the rocker arm shafts. Most of these early engines featured either grooved or offset holes in the third and fourth cam journal. In some instances a combination of both grooves and holes were employed. You must remember that if your engine has shaft type rocker arms there must be some groove or oiling hole combination on the cam journals. Chrysler began producing engines with hydraulic roller cams in 1986. These early roller cam engines still used the shaft mount rocker arms and had oil holes in the #2 and #4 bearing journal. Early 1986-91 318ci/5.2L and early 1987-91 360ci/5.9L engines equipped with hydraulic roller camshafts and lifters will allow conventional hydraulic, mechanical or roller camshafts and lifters to be installed in these engines, providing the appropriate components are used. In 1992 the new Magnum ''A'' engine was released using a pedestal style individual mount rocker arm design that oiled through the pushrod and did not have oil holes in the cam. There were also two different styles of snouts on the cams, the longer snout (.950'' from the first step) accommodates a fuel pump eccentric and the upper timing gear while the shorter snout (.650'' from the first step) came in the fuel injected engines that do not use a fuel pump eccentric. Using the wrong cam core will result in engine failure. It is very critical that the new cam match the old cam's characteristics.

Use in 340-360 street machine. Dual exhaust, 3.53-3.91 gear, 9:1 compression. Headers & aftermarket intake, 2500 stall converter.

Operating Range:2500-6000 RPM
Duration Advertised:280° Intake / 280° Exhaust
Duration @ .050'' Lift:230° Intake / 230° Exhaust
Valve Lift w/1.5 Rockers:.480'' Intake / .480'' Exhaust
Lobe Separation Angle:110°

COMP Cams 20-232-4 - Comp Cams 'Magnum' Hydraulic Flat Tappet Camshafts

Comp Cams Magnum Camshafts are very aggressive and specifically designed for the street enthusiast looking for more power with that Pro Street sound. Intended for performance oriented vehicles that will see little street use. The idle characteristics of your engine will change due to the increased duration and overlap of the Magnum Cam Series. You will notice a racey idle with the 280-grind while the 292 and 305-grinds will produce a rough or ''rumbly'' idle. Stock components are generally incompatible. Changes are needed in rear end gear ratios, headers and the torque converter. Magnum Cams will affect your power accessories to a certain extent. The 280 and 292-grinds are the biggest cams that should be used with power assisted brakes, air conditioning, etc. You should remember that the bigger the engine is, the less the cam will affect the vacuum which affects your power accessories. The smaller your engine is, the more the Magnum Camshaft will affect your power accessories. Most late model vehicles have a vacuum canister. If your vehicle does not have a vacuum canister, it may be necessary to add one.

268H Series
Good street performance with stock converter, choppy idle.

270H Series
Great for high performance driving in street machines. The 270H has a rough idle in small blocks and a noticeable idle in big blocks. This is the largest cam that can be used with a stock torque converter. The 270H should not affect power accessories, but should be used with headers and 4bbl carburetor.

280H Series
Best for serious street machines. This cam has a definite rough idle and will sometimes affect power accessories. It can be driven extensively on the street or raced on the weekends. The 280H needs an aftermarket converter, intake manifold and headers.

286H Series
Designed to fill in the gap between teh 280H and 292H. For serious street machines and bracket racers. With a rough idle and lower vacuum signal, this is not an average street cam. At least a 2500-RPM converter must be used, but a 3000 is recommended.

292H Series
This cam is for the serious street/strip type car. An aftermarket torque converter should be used as well as headers, intake and increased compression. The 292H has a radical, rough idle.

305H Series
The 305H should really be considered for Pro-Street type cars where actual streetability is not a major concern. The design of this cam also makes it ideal for all bracket racing engines. Major engine modifications are needed as well as transmission and driveline improvements. The 305H works best in large cubic inch engines and has a radical idle. This is the only hydraulic cam in the series that does not have an advance made into it and will need to be degreed in.

Camshaft & Lifter Kits are indicated by a CL in their part number and include Camshaft, Lifters, Assembly Lube, Decals, and Instructions.

Complete Kits are indicated by a K in their part number and include Camshaft, Lifters, Timing Chain & Gears, Valve Springs, Retainers, Locks, Assembly Lube, Decals, and Instructions.

Small Kits are indicated by a SK in their part number and include Camshaft, Lifters, Timing Chain Set, Assembly Lube, Decals, and Instructions.

COMP Cams 249-20-232-4

Exhaust Valve Lift (in.)
Intake Valve Lift (in.)
Exh. Duration @ .050 in. (Deg)
Int. Duration @ .050 in. (Deg)
Exh. Duration Advertised (Deg)
Int. Duration Advertised (Deg)
Lifter Type
Hydraulic Flat Tappet
Engine Make/Size
Mopar 273-360
RPM Range
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