Camshaft Degreeing it in?
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Camshaft Degreeing it in?

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    Senior Member Daniel Palin's Avatar
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    Default Camshaft Degreeing it in?

    Any preference to degreeing in a cam on a BBC in a jet boat? I figured I would just go 0 "straight up" with my offset bushing but Im just curious as to how most of us are setting theres up? My motor set up is a 427, Tunnel Ram Intake with 2 Holley 450cfm carbs. Camshaft is a Comp Cams 11-240-4 extreme marine and im running a gear drive. Is it better to go advanced some? Im not looking to race or anything, just wanna sound good & run good. Thanks for anyones input on this.

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    Quote Originally Posted by Daniel Palin View Post
    Any preference to degreeing in a cam on a BBC in a jet boat? I figured I would just go 0 "straight up" with my offset bushing but Im just curious as to how most of us are setting theres up? My motor set up is a 427, Tunnel Ram Intake with 2 Holley 450cfm carbs. Camshaft is a Comp Cams 11-240-4 extreme marine and im running a gear drive. Is it better to go advanced some? Im not looking to race or anything, just wanna sound good & run good. Thanks for anyones input on this.
    Set cam at 4degrees advanced.

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    Senior Member jetboatperformance's Avatar
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    Quote Originally Posted by Daniel Palin View Post
    Any preference to degreeing in a cam on a BBC in a jet boat? I figured I would just go 0 "straight up" with my offset bushing but Im just curious as to how most of us are setting theres up? My motor set up is a 427, Tunnel Ram Intake with 2 Holley 450cfm carbs. Camshaft is a Comp Cams 11-240-4 extreme marine and im running a gear drive. Is it better to go advanced some? Im not looking to race or anything, just wanna sound good & run good. Thanks for anyones input on this.
    If memory serves some Comps are already advanced , might check with them
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    Senior Member Daniel Palin's Avatar
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    So with the cam grind already 2 degrees advanced which offset bushing should I use then?
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    Senior Member Daniel Palin's Avatar
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    Cam specs:
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    Senior Member ol guy's Avatar
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    Put the cam in straight up and try it! No offense but you don't give enough info for a proper opinion! As in induction hull weight impeller cut and intended use! Buying an off the shelf cam is a crap shoot. All I can say is run it and see how it performs! If it's lazy on the bottom, advance it a pinch, if it is hard on the bottom and lays down on the top, retard a pinch. Good luck!!!

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    Senior Member ol guy's Avatar
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    Never fails!!! info coming up as I am typing! With the specs on that cam I would probably retard 2 degrees to start.

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    LP-25.com Infomaniac's Avatar
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    Are you actually checking it Daniel?

    You have to put a degree wheel on it. The mix of cam pin, timing set etc will more than likely not put it where you think you are.

    It's extremely rare for me to find one exactly where it should be by the install.

    And you verify the timing marks on the balancer and pointer while the wheel is still on it.
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    Senior Member Daniel Palin's Avatar
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    Thanks for the input. The hull is a 87 Youngblood Picklefork, not sure what the weight is or which impeller is in it. Im running a Weiand Tunnel Ram with 2 Holley 450cfm carbs. 1970 BBC Oval Port Heads and a 1969 427 Engine

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    Senior Member Daniel Palin's Avatar
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    My neighbor races dirt cars and he has a degree wheel so i am gonna have him help me out with degreeing it in correctly.

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    Quote Originally Posted by Daniel Palin View Post
    Thanks for the input. The hull is a 87 Youngblood Picklefork, not sure what the weight is or which impeller is in it. Im running a Weiand Tunnel Ram with 2 Holley 450cfm carbs. 1970 BBC Oval Port Heads and a 1969 427 Engine
    I will stick with advising 2 degrees retard with the heads and carb set up. The oval ports will need a little help on the top end. Buy themselves they will produce enough bottom end! Changing cam timing is an easy fix in the boat! Try it and go!!! Good luck!!!!!!

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    Senior Member Daniel Palin's Avatar
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    Quote Originally Posted by ol guy View Post
    I will stick with advising 2 degrees retard with the heads and carb set up. The oval ports will need a little help on the top end. Buy themselves they will produce enough bottom end! Changing cam timing is an easy fix in the boat! Try it and go!!! Good luck!!!!!!
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    Quote Originally Posted by Infomaniac View Post
    Are you actually checking it Daniel?

    You have to put a degree wheel on it. The mix of cam pin, timing set etc will more than likely not put it where you think you are.

    It's extremely rare for me to find one exactly where it should be by the install.

    And you verify the timing marks on the balancer and pointer while the wheel is still on it.
    X2!

    Put wheel on it and see where you actually are. Just randomly throwing a +4, +2, -8, x64, /3, whatever bushing is just about as good as guessing how many fingers I'm holding up right now. Personally, I'd degree it and make sure it is where the cam mfg actually wants all the timing events to occur... if you were to exactly know what all you have going on there... then playing around with timing events may be beneficial... but, seeing as you haven't listed any details such as compression, impeller, etc... best bet is go with where it was ground to and go with it.
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