What hydraulic roller cam to use in place of this solid roller cam in my 598's?
 

So I have a pair of chief 598's, with 10-71's, super chillers, low boost 5-7 psi. 900ish.... Hp. Very low hours, fresh, running excellent. But I would like to convert them to hydraulic rollers, from the solid rollers they are now. Don't plan on ever spinning them past 6k. Can someone recommend a cam grind, spring, and lifter combo that would duplicate my current power level, but in hydraulic form?

What rpm does it idle at out/in gear?
Shift in/out of gear ok without stalling? Big props?

Right now they surge from about 800 to 1400 rpm. They shift in and out of gear excellent. If I lean out the idle circuit they won't surge, but die as soon as I put them in gear. I kinda like the surge anyway. Yes big props, 37 pitch 17.5 diameter, 18 degree rake.

Rob It has been a while since I've looked into Hyd. Rollers but I'm not sure you will be able to replicate that type of aggressive cam in a hyd roller. but there are many others with more knowledge in that area than me. I hope they will chime in on this. But I bet that motor sounds real strong!

Yes these motors sound really nice :). I have been talking with some other people and they have said this should be no problem with today's hydraulic rollers... Just trying to figure out the correct recipe!!

i can pm you with the cam specs in my 588,s if you would like but i recommend calling bob madera,he is up on all the latest products and is very good at picking a cam for any application.i know someone who got a price from bob and then called to compare prices,he bought from bob.

Bob Madara is OSO's cam and valve train guru . Best of all he is a very honest man as well as being very intelligent . 585-654-8583

Hydraulic roller in my 598 is 250 258 @ .050 .696 .680 lift I run the morel high rpm lifters. The lifters will go to 7300 rpm they do like some spring pressure 200-225 closed 500-550 open. Oil can't be any thicker than 10w40. I run 30 weight and run the piss out of it with no issues so far. I tried to run these lifters on a solid roller cam when it was first put together and it did not work having preload in the lifter hung the valves open and the motor made no compression. If I set them at zero lash it would run like a champ. Zero lash on a hydraulic lifter in a boat probably not a good thing...

a+

If you pick Bob Madara of Marine Kinetics, then you will have picked the right guy for your cams....when it comes to marine cam specs for a certain application, Bob has been the "go to guy" for many years here on OSO....and he's a very smart dude.