A boat engine is essentially the same loading as if you strapped it to a dyno and held a solid load on it for hours on end at full RPM. On marine engines you usually want to run one whole less compression point than a performance auto engine due to the fact that the engine never cruises. You will want to run premium pump gas also. 9.5:1 is about the max for iron marine motors safely. If they are fast burn style chambers (vortecs) they are very prone to detonation and use much less timing than open chambers.īe careful with that much compression on cast iron heads. Frankly most sbc factory iron heads won't make the power you are looking for without a ton of expensive work in which you could have bought a nice aftermarket set cheaper. They are extremely restrictive when going over stock power levels. Auto cam's have completely too much valve overlap and when running a wet exhaust manifolds (especially your stock ones) the engine will have a tendency to suck water back into the cylinders and ruin your engine in a hurry.Īlso, if you are planning on running the factory exhaust manifolds, you won't see much of the power you think your engine should make. This is not something you want to throw a auto cam in and go. Most marine cams are also designed to give much stronger low end torque that an automotive cam. An Automotive cam has a much different overlaps and lobe center profiles.
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