Originally Posted by Baja226sport (Post 4146800)

Exhaust is about 6 inches above water line when not running, yes external flappers. Water did not come back up the exhaust from outside the boat. My only other question which I have been avoiding is this.....zz502 GM performance cam is what I found in this engine when I tore it down. Not real big. .527/.544 duration at .050 in. for intake is 224 and 234 for exhaust with 110 LSA.

The boat had Stainless marine exhaust with standard risers (about as long as stock mercruiser). With the 110 LSA could it pull enough water back to do this if that was happening?

Again, 200 hours on these engines. So it has been fine for a while. The only thing I changed was lowered idle from 1000 to 750 and all of a sudden I have problems.

Originally Posted by donzi matt (Post 4146879)

Is it the same motor that was the subject of this thread?

http://www.offshoreonly.com/forums/g...-pressure.html

Originally Posted by donzi matt (Post 4146879)

Is it the same motor that was the subject of this thread?

http://www.offshoreonly.com/forums/g...-pressure.html

Originally Posted by Black Baja (Post 4146957)

When it was hard to start to it just crank and crank and not start or was it difficult turning over and broke the starter that way?