Re: reliability GM ZZ502-502 HP GM CRATE ENGINE
 

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).

Re: reliability GM ZZ502-502 HP GM CRATE ENGINE
 

Kid I know you meant to say that you replaced the 11pound bypass valve to the 30lb one spec-ed for external filter/cooler :D

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 :drink:

http://www.offshoreonly.com/forums/s...d.php?t=106633

Re: reliability GM ZZ502-502 HP GM CRATE ENGINE
 

I know you knew that...I know you knew I knew....you know....ah fuggit :o

Wobble - Thanks for the correction. Hence my little disclaimer in (***) after refering to the bypass valve....senior moment perhaps? :drink:

Re: reliability GM ZZ502-502 HP GM CRATE ENGINE
 

That is THE oil temp/pressure thread for sure!!

Re: reliability GM ZZ502-502 HP GM CRATE ENGINE
 

:D :drink:

Thanks for the post. Still relevant ten years later.

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.

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.

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!