572 marinized?
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572 marinized?

  1. #1
    Screamin SeaMonkees Schi-502's Avatar
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    Default 572 marinized?

    I've got a ZZ502/502, ahead of a Berk, 12jg, SS "A", droop,Place and open loader, in my 22' Schiada Daycruiser. I want to put in a ZZ572/620 (p/n 12498793) in the same boat. The GM performance catalog states this engine is not for marine use. Any input? Anybody?
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    Quote Originally Posted by Schi-502 View Post
    I've got a ZZ502/502, ahead of a Berk, 12jg, SS "A", droop,Place and open loader, in my 22' Schiada Daycruiser. I want to put in a ZZ572/620 (p/n 12498793) in the same boat. The GM performance catalog states this engine is not for marine use. Any input? Anybody?
    You are going to hear from people that have done this before but what it all comes down to is the clearances aren't made for a marine application. IMO you are rolling the dice.

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    Quote Originally Posted by Some Kind Of Monster View Post
    You are going to hear from people that have done this before but what it all comes down to is the clearances aren't made for a marine application. IMO you are rolling the dice.

    and you will hear that lots of people have done this without a hiccup! There are a ton of boats out there than don't pay the $$$ for a "marine" engine. Often just getting at the roots what makes a marine engine is questionable (besides J tubes, sealed started, etc.). ZZ502, isn't that already a non-marine engine????

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    Marine engines experience a wide range of temperature during operation as opposed to an engine in a car that has a thermostat keeping the engine at a defined operating temp at all times. Loose tolerances to allow the metal (block/pistons) to expand and contract in conjunction with sometimes rapidly fluctuating temperatures.

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    Contact Duane at HTP he has experiance with these engines.

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by Oldelmn8tr View Post
    Contact Duane at HTP he has experiance with these engines.
    I concur, contact Duane...AND I believe he has even used the higher compression 720 HP 572 >on pump gas with very good results.
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    Default 572

    It has been my experience that this engine is completly torn down and go thru all of the spec's. Balance and reassemble with all marine gaskets.We dyno the engine over at WesTech and the 620 version will make approx.680hp with a little tweaking.

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    Quote Originally Posted by Master Sergeant View Post
    Marine engines experience a wide range of temperature during operation as opposed to an engine in a car that has a thermostat keeping the engine at a defined operating temp at all times. Loose tolerances to allow the metal (block/pistons) to expand and contract in conjunction with sometimes rapidly fluctuating temperatures.

    does this apply to closed cooling? There is a thread somewhere (maybe *gasp* on HB) regarding 572 build-up by Duane at HTP.

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    I have had 2 different customers put these in marine applications and both dropped valves. Knowing where GM is getting their valves and what they are paying for them I would pull the heads and put good valves in them.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    Default 572

    Chris, It's not the valve that is the problem the problem is the guide clearance.All of the heads are set up with an automotive spec on a closed cooling system.The guide clearance has to be opened up to atleast 1.5 thousandth's.This also applies to the Edlebrock cylinder head because they are the people that cast up the Chevy head. A severe duty valve is a good choice for a normally asperated engine and an inconel for a blown or nos engine.I know this first hand because the same thing has happened to me ,cooler cylinder head tight guide clearance means valve get stuck in the guide makes contact with the piston and then all hell breaks loose.

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    Quote Originally Posted by SlowSquirt View Post
    does this apply to closed cooling? There is a thread somewhere (maybe *gasp* on HB) regarding 572 build-up by Duane at HTP.
    No, as long as you have a thermostat.

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    Quote Originally Posted by greg shoemaker View Post
    Chris, It's not the valve that is the problem the problem is the guide clearance.All of the heads are set up with an automotive spec on a closed cooling system.The guide clearance has to be opened up to atleast 1.5 thousandth's.This also applies to the Edlebrock cylinder head because they are the people that cast up the Chevy head. A severe duty valve is a good choice for a normally asperated engine and an inconel for a blown or nos engine.I know this first hand because the same thing has happened to me ,cooler cylinder head tight guide clearance means valve get stuck in the guide makes contact with the piston and then all hell breaks loose.
    Agreed. I don't feel these are bad engines to start with but they need to come down and have some marine parts and clearances put in them. Once this is done go play.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

  15. #13
    Screamin SeaMonkees Schi-502's Avatar
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    Default Thanks

    Thanks for the replies. I'll contact Duane.

    And yes, my ZZ502 is of the same "crate". I've not had any problems. It runs fine. I would like to try something new (bigger).
    Mark
    Loose, the Dogs of War!

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    Screamin SeaMonkees Schi-502's Avatar
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    Default PM'd Greg

    I'll wait to see what Greg can do for me.
    Thanks for the input.
    Greg,
    I'm currently turning 5200 rpm, 65 mph on the SS "A", 12 jg. Pump recently rebuilt by Dave @ GT Boats in Cordelia. Every thing is tight, I just want to go faster. 5 mile an hour itch...
    Loose, the Dogs of War!

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