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reliability GM ZZ502-502 HP GM CRATE ENGINE

Old 07-11-2006, 08:38 AM
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Default Re: reliability GM ZZ502-502 HP GM CRATE ENGINE

Originally Posted by Kidnova

I'm starting my 4th season with the ZZ502/502. Other than oil temp issues covered in the above paragraph/s, to date the engine has run flawlessly and has always been dependable.

Bill
I had a pair of the zz502's in my old boat (Cigarette Bullet)and it ran great for the two seasons that i had it (115 hours). The new owner has put another 100+ hours on them and they are still running great. I believe that they had 35 hours on them when I got the boat. They had been marinized (valves changed to inconel, cam and lifters, head gaskets, brodex single plane intakes and 1050 Dominator carbs).
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Old 07-11-2006, 09:45 AM
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Default Re: reliability GM ZZ502-502 HP GM CRATE ENGINE

Originally Posted by Kidnova
Hey Jeff32 -

After some running time and 3 oil coolers later, I finally figured out that the center bypass valve in the engine oil pad needs to be removed. And the bypass valve on the side of the pad needs to be changed from a +,- 30 lb. to a +,- 11 lb. (The "lb" reference may not be correct but if you need more on this let me know and I'll see if I can dig out the info).
Kid I know you meant to say that you replaced the 11pound bypass valve to the 30lb one spec-ed for external filter/cooler
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Old 07-11-2006, 09:48 AM
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Default Re: reliability GM ZZ502-502 HP GM CRATE ENGINE

This thread should be required reading for anyone upgrading power or experiencing oil pressure/temp issues

http://www.offshoreonly.com/forums/s...d.php?t=106633
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Old 07-11-2006, 09:54 AM
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Default Re: reliability GM ZZ502-502 HP GM CRATE ENGINE

Originally Posted by Wobble
Kid I know you meant to say that you replaced the 11pound bypass valve to the 30lb one spec-ed for external filter/cooler
I know you knew that...I know you knew I knew....you know....ah fuggit

Wobble - Thanks for the correction. Hence my little disclaimer in (***) after refering to the bypass valve....senior moment perhaps?
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Old 07-11-2006, 09:56 AM
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Default Re: reliability GM ZZ502-502 HP GM CRATE ENGINE

Originally Posted by Wobble
This thread should be required reading for anyone upgrading power or experiencing oil pressure/temp issues

http://www.offshoreonly.com/forums/s...d.php?t=106633
That is THE oil temp/pressure thread for sure!!
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Old 07-11-2006, 10:04 AM
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Default Re: reliability GM ZZ502-502 HP GM CRATE ENGINE

Originally Posted by Kidnova
I know you knew that...I know you knew I knew....you know....ah fuggit

Wobble - Thanks for the correction. Hence my little disclaimer in (***) after refering to the bypass valve....senior moment perhaps?
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Old 09-09-2016, 01:58 PM
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Thanks for the post. Still relevant ten years later.
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Old 09-10-2016, 01:08 AM
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Originally Posted by GLH
He had ZZ572's speakerboy so get your facts straight !
I'm pretty sure they had issues. I don't remember that ending well. I think there is a thread in the Scarab section with someone having good luck with the GM crate motors. I forgot which though, might be the 572s.
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Old 09-10-2016, 07:25 AM
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I had been thinking of putting that exact motor in my 22 SCARAB, because GM stated in their performance catalogue that this engine was suppose to be good for marine use. I called an excellent engine builder in our area, to get his thoughts and opinion, and his answer was, if you want to see what happens when you put that engine in a boat, come out here and have a look at the 2 I have sitting here. He said some guy tried to re-power a 34' BAJA with 2 of those, and they both broke within 20 hours.
That made my decision very easy, and I left the stock 350 in my SCARAB.
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Old 09-10-2016, 07:30 AM
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It is clearly written black on white in that performance catalogue NOT INTENDED FOR MARINE USE !

No where is written they are ok... Wondering where you saw that i have one of each year for the past like 15 years!
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