Comp marine cams?
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Comp marine cams?

  1. #1
    Senior Member Sharkbit's Avatar
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    Default Comp marine cams?

    are these a good choice for jets? I have a mostly stock 454 in a 20ft cruiser. It does have intake, 850 dp, hei. Berk split bowl and droop. I know this boat will never be fast but....currently runs 55 at 4200rpm.

    I've figured out the fuel pump lobe is flat on the cam so I got to thinking about what shape the other lobes would be in. I was looking at this

    CL11-236-4 - Comp Cams 'Xtreme Marine' Hydraulic Flat Tappet Camshafts Details

    Chevy 396-454ci Big Block 1965-96
    *Note: In order to use these camshafts in 1965-66 396/427ci blocks, it is necessary to machine a 3/16'' wide x 7/64'' deep groove in the rear main journal of the cam to allow oil flow to the top of the engine. Jet with ''A'' impeller, strong mid-range good throttle response, noticeable idle.
    Operating Range:1600-5800 RPMDuration Advertised:270° Intake / 286° ExhaustDuration @ .050'' Lift:226° Intake / 236° ExhaustValve Lift w/1.7 Rockers:.544'' Intake / .547'' ExhaustLobe Separation Angle:112°

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  3. #2
    Senior Member Sharkbit's Avatar
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    I wanted to keep it reliable as ever just maybe pick up a little power. This will be a winter project along with a pump rebuild and interior. $$$$$$$

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    Senior Member Josh@JBP's Avatar
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    In a mostly stock engine(assuming 8:1 ish compression), you'll be better off with the 11-232-3, the next step down from the cam you listed.

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    Are you sure the lobe is gone and not a wore down pushrod?

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    AKA OhOneWS6 Last Mohican's Avatar
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    He just doesn't want to be shown up by 25' of Pimpness. The flat pump lobe is just an excuse for him to do a cam swap.

    In all seriousness he may be right about the lobe being flat. Several of us looked at it on several occasions at the beginning of summer. We all came to the same conclusion.

  8. #6
    Member RUFF IDLE's Avatar
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    Exclamation

    Yiu may already be aware,Be sure to use motor oil that is compatible with a flat tappit cam or the new cam won't last long.
    My garage is BIGGER than my house, NO PROBLEM ! Any questions?

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    Senior Member speedealer's Avatar
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    have a 21 sleek 482 9:1 comp,small port o49 castings with 225 /188 valves,team G intake 850. We boat at 4500ft and higher. we run solid rollers with 230 to 245 and mid .600 lift, we also tighten lobe centers to 106. really helps at altitude,does this hold true for lower altitudes. Boat runs 67mph on gps.

  10. #8
    Boat Nut sleekcrafter's Avatar
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    Ran one of these for years......

    Comp Cams High Energy 280AH hydraulic Marine camshaft for Chevrolet BB 396-427-454. Jet boat with A impeller. Skiing, pleasure use, & performance.

    Specs are as follows: 280/288 Advertised Duration
    Duration @ .050" 232/237
    Valve lift .547/.547 with 1.7 rocker ratio
    Lobe seperation angle 110 degrees
    RPM operating range 2400-6400
    Upper Midwest Power Boat Association
    DRAG BOAT RACING UMPBA #926


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    So how did you like it...hydraulic lifters or solid

  12. #10
    Senior Member Sharkbit's Avatar
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    Quote Originally Posted by [email protected] View Post
    In a mostly stock engine(assuming 8:1 ish compression), you'll be better off with the 11-232-3, the next step down from the cam you listed.
    Good point! It does have flat tops so 8:1 sounds right. A baby cam would prolly be better.

  13. #11
    Senior Member Sharkbit's Avatar
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    Quote Originally Posted by Last Mohican View Post
    He just doesn't want to be shown up by 25' of Pimpness. The flat pump lobe is just an excuse for him to do a cam swap.

    In all seriousness he may be right about the lobe being flat. Several of us looked at it on several occasions at the beginning of summer. We all came to the same conclusion.
    Don't make me sneak up and steal your drain plug!

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