Comp Cams Xtreme Marine Roller Camshaft 1967-1996 Chevy BB 396-454 11-445-8

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Competition Cams Extreme Marine Retrofit Roller Camshaft

#11-445-8 or 114458

NOTE: You Are Purchasing the Camshaft ONLY. All Other Part Numbers Shown Below Are For Reference Purposes Only

Fits: 1967-1996 Chevrolet Big Block 396, 402, 427, 454 Mark IV an d Mark V Engines

Cam Style: Hydraulic roller tappet
Basic Operating RPM Range: 1,600-5,400
Intake Duration at 050 inch Lift: 218
Exhaust Duration at 050 inch Lift: 224
Duration at 050 inch Lift: 218 int./224 exh.
Advertised Intake Duration: 270
Advertised Exhaust Duration: 276
Advertised Duration: 270 int./276 exh.
Intake Valve Lift with Factory Rocker Arm Ratio: 0.510 in.
Exhaust Valve Lift with Factory Rocker Arm Ratio: 0.510 in.
Valve Lift with Factory Rocker Arm Ratio: 0.510 int./0.510 exh.
Lobe Separation (degrees): 112
Computer-Controlled Compatible: No
Grind Number: CB XM 270HR-12
Valve Springs Required: Yes

Quantity: Sold individually.


Xtreme Marine camshafts from COMP Cams take advantage of the newest developments in camshaft engineering. Their aggressive lobe design produces better throttle response and top-end horsepower than other cams with the same duration at .050 in., while delivering increased engine vacuum. These cams are available for everything from pleasure boats to race applications, so you can always enjoy Xtreme performance on the water. From hydraulic and mechanical, to flat and roller tappet, COMP Cams offers camshafts for your watercraft dating as far back as the 1950s.


Recommended Components:

Component Part Number
Complete K-Kit K11-445-8
Small SK-Kit SK11-445-8 [7,10]
Cam & Lifter Kit CL-Kit CL11-445-8 [7,10]
Lifter Kit 854-16 / 15854-16
Timing Set 2110 / 3110
Rocker Arms 1411-16 [17,18] / 1320-16 [17,18]
Push Rods 7815-16 [16]
Valve Springs 911-16 / 924-16 [2]
Steel Retainers 748-16 / 741-16
Valve Locks 612-16 [75]
Valve Seals 504-16 / 505-16 [2]
Distributor Gears 12200
Camshaft Break-In Lube 159


Installation Notes (These notes apply to the above recommended components with the trailing installation note numbers)
Note Description
2 [2] Requires machining on cylinder heads.
7 [7] Stock springs cannot be used.
10 [10] Requires thrust button & wear plate.
16 [16] Truck engines have .400” taller block.
17 [17] Mark V and Mark VI heads must use kit w/studs.
18 [18] 50-state legal for ‘93 & earlier B.B. Chevrolet V8, 396-454 c.i., C.A.R.B. E.O. #D-279-4.
46 [46] Must use bronze tip fuel pump pushrod when using high pressure or high volume pump.
75 [75] Most aluminum heads come standard with 11/32” valve stems. Use appropriate valve locks, retainers, and seals.
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