If you have a water hose coming off the rear of the water log which feeds the bottom of the headers, and this hose connects to the tailpipe, then remove this hose and cap off the rear of the water log with a pipe plug, and cap off the tail pipe side with an apporopriate sized cane end.

I discovered that Mercury racing had removed this hose on later 600/700 motors because of the many water pressure issues with the 600sci and 700sci motors they were having.

This hose is one of the major causes of low water pressure and possible header discoloration.

Removal of this hose is explained as part of the water re-route for the innercooler on these motors that is included in Whipples upgrade kits.

Chris

Chris thanks for the help that cleared it up for me.

According to my diagram you also have to drill a larger whole in the tail pipe feed bypass hose

I could not open the file you attached, but yes, we also opened up the water restrictor holes in the top of the tail pipes.

I would love to be able to open that file.

Chris

Chris I finally got a new scanner see if you open this one

Has Dustin finished and sold you a new flame arrestor?

I was able to open your file.... thanks... that is very similar to what we did.

The engine process was delayed due to the extreme time it took to develop a CNC program for the heads.

The motor is back on the dyno, and we should see some numbers today.

Chris

How do you feel about the Hydro P5X?

Any opinion / info on the Hydro vs the Merc Maximus?

Chris so you did drill out the stb. side to 13/32 at the tail pipe

I couldn't get the first one open either, this one is fine.

Does this apply to the 525's as well, or just the 600/700 SC motors?

Ragged I would have to make a phone call to confirm that, but I think that includes 525 but dont hold me to that

How did you get your boat to turn 5600 with out hitting rev limiters

Is this a Merc recall of sorts? If you can find out I would like to know.


Mine @ 5600? Did I miss something here?