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Old 03-17-2010, 06:01 PM
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Xtreme Marine Cam

My 454 was pieced together originally for a jet boat using comp cam # 11-236-4 now it will be placed in my 61 Chevy truck. Is there any negative draw backs to using marine cam in street application ? What is difference between marine and street cams?

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Old 03-17-2010, 07:55 PM
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Quote:
Originally Posted by truckboy61
My 454 was pieced together originally for a jet boat using comp cam # 11-236-4 now it will be placed in my 61 Chevy truck. Is there any negative draw backs to using marine cam in street application ? What is difference between marine and street cams?
I haven't seen much difference other than marine cams aren't necessarily ground for way high rpm performance. You want to make good torque at the bottom so you don't have to wing the motor coming away from the dock to get the boat moving. Most Comp automotive cams are ground on a 110 degree lobe separation angle. This cam of yours is ground on a 112 degree LSA which should show real good intake manifold vacuum for power brakes, etc. Here's the timing card on your cam. Note that in the installation notes, it calls for better springs. The springs to use are shown on the card....
http://www.compcams.com/Cam_Specs/Ca...?csid=404&sb=0
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Old 03-17-2010, 08:01 PM
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This cam will work just fine.

95% of the "marine cams" used by Mercury Marine, OHC etc are direct copies of the factory GM performance cams used in street motors.
Some odd ball Big block marine motors had special cam grinds. Some had reverse crank/prop rotation requiring a reverse grind cam.
Some used the Good "Taxi" hyd lifters and premimum quality cam cores.

With Marine water cooled "WET manifolds" you want to avoid excessive cam valve overlap valve timing to avoid getting water sucked into the marine engine at idle. You also want a smooth low rpm engine idle speed to allow easy outdrive shifting and docking. So they typically have a wide(er) cam LSA to reduce valve overlap as a rule.
Other than that, no difference.
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