Marine Heads Different? - Team Camaro Tech
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post #1 of 9 (permalink) Old Mar 26th, 08, 06:11 PM Thread Starter
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Marine Heads Different?

Just bought a set of 906 vortec heads that were on a marine engine from Mercruiser. Does anyone know if marine heads are different from truck vortecs with the same casting number? I know some parts are different due to the way marine engines are used. Thanks
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post #2 of 9 (permalink) Old Mar 26th, 08, 06:27 PM
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Thumbs up Re: Marine Heads Different?

The castings are the same.
Iron heads are the same alloys and construction. Aluminum heads are 'Hard-coated' to resist corrosion in salt water environments.
The valve train parts can vary slightly depending on engine type. Many marine applications will use truck parts v.s. car stuff. Things like valve rotators, retainers and springs can vary slightly from most car applications.
The heads may have plugs in some of the exterior holes normally used for sensors etc. in car heads.
Fittings and plugs are almost always brass instead of steel.

They are normally good candidates for street performance and feature the good HD parts from the factory.

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post #3 of 9 (permalink) Old Mar 26th, 08, 06:32 PM
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Re: Marine Heads Different?

Same exact heads, valves, springs etc. Only real difference is the marine heads are usually too corroded to mess with unless they are off an engine with a closed cooling system

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post #4 of 9 (permalink) Old Mar 26th, 08, 06:53 PM Thread Starter
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Re: Marine Heads Different?

...or a new motor torn down for upgrades.
I immediately noticed brass plugs but was mainly curious about the valves, guides and springs. If Bill is correct, guess I know now.
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post #5 of 9 (permalink) Old Mar 26th, 08, 07:04 PM
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Re: Marine Heads Different?

I had some Merc heads that were suppose to have brass guides in them..never confirmed it...but I believe they were advertised as such..
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post #6 of 9 (permalink) Old Mar 26th, 08, 07:23 PM
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Re: Marine Heads Different?

I have never seen a Mercruiser head with bronze guides. Maybe some of the newer high horsepower ones have them, but I have not seen them yet. Just did 4 of them for a 525 HP 502 and they were nothing special. The 502's do have good valves in them, inconel exhausts that are high dollar. Every small block head I have seen is basically a truck head.

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post #7 of 9 (permalink) Old Mar 26th, 08, 07:28 PM
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Re: Marine Heads Different?

Usually the exhaust valves are inconel or some form of high temp material. Lots of load on a marine engine most components are designed for torque-mid horsepower.

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post #8 of 9 (permalink) Old Mar 26th, 08, 08:02 PM
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Re: Marine Heads Different?

Quote:
Originally Posted by quickboat View Post
Usually the exhaust valves are inconel or some form of high temp material..
Only on the Rats, and even then the higher HP ones only. Every small block I have seen has been nothing more than a truck head. The newer Vortec engines dont even have any different head gaskets on them. I swear they are just GM crate engines. I have probably done at least one set of Mercruiser heads every two weeks for the last couple of years, so I have seen my share

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post #9 of 9 (permalink) Old Mar 26th, 08, 08:18 PM
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Re: Marine Heads Different?

Yea my merc small block exhausts were gone..nothing special- I was surprised to learn this. Al head with stainless valves worked well for me. Running the sodium filled fast burn valves/head now with good results so far.

Looks like these big dawgs get bronze guides...

http://site.mawebcenters.com/tristat...ttristate.html
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