mv35

can anyone tell me if there is a better location to draw water pressure from rather than the bottom side ofthe block.and the best place to install a pop off valve.thanks.

737jetmech

My pressure is taken from the intake manifolds...the pop-off valves are installed just prior to entering the cross-overs and dump out the side of the boat. Pressure is around 28 psi @ full throttle which is the pressure valves by-pass. The lower block location tend to become clogged over time (fresh water cooled)

Bob

Python82

What kind of pop off valves are most people using??? and do you install it before the water goes into the crossover???

Thanks

737jetmech

Mercury racing sells them for around $102. (cheap plastic)

installed before the crossover ... and after the oil cooler ...

Bob

Python82

Does anyone else make one??? If not where could I buy the Mercury racing one? Part Number???

Thanks again

737jetmech

part # 863208A 3 (Mercury Racing)

www.mercruiserparts.com (Bam marine) is where I purchased them.

mv35

bob thanks for the info.where did you tap your water pressure line from the intakes.i have supercharged engines w\no thermostats.

737jetmech

I used a spare temp sender boss on the front of manifolds.Here are a few pics of the installation

Bob

737jetmech

each dump is located just outboard of engines ... sorry its not the best picture ...