abmotorman

I was thinking about the comp cams xtreme energy 270/276 or 276/282 hydraulic roller cam. Has anyone used either one of these? If so what are the docking manners like. Staying with the stock bore 350cu engine. Going mostly dry with the exhaust. Water will enter at the tips.

sprink58

I'm not familiar with the two you have listed...I have twin 355's in my 255 Formula and I'm running a Comp XM264/270 Hydraulic Roller. These engines idle at 700 and drop to 650 in gear. The "dock manners" are great. great!! You have to open the hatch to hear any "Cam" sound at all...thru hub stock exhaust. Here's the link to mine http://www.compcams.com/Company/CC/c...?csid=168&sb=2.

I'm still tuning mine in but these are sweet cams. I'm running their whole kit...had to work the spring pockets a little to take the big springs and I have Comps "Scorpion" Needle Bearing Rockers....very smooth...very quiet...and great power to 5500 plus. I'm running Bravo I's with 1.5 gears and Mirage 23" props. My boat is a close match to yours and performs very well.

I recommend the Comp XM Roller Series.

ACrooks69

iTrader: (1)

I had a 383 with trick flow heads and a Performer RPM intake and the XM276HR, I made 437hp@5400RPM and 479 lbs/ft @ 4100. It had a noticeable idle over stock, but still went into gear fine. You will be just fine keeping it dry to the tips. My water entered right after the short EMI riser and went into a S-pipe and had no problems, but I had a few more cubes. I have since gone to a bigger cam and have this one wrapped in newspaper waiting for another motor. Let me know if you want to save over paying full price. $150 shipped sounds fair to me. PM me if you are interested.

I should also note that it is a step nose for an 87 and later OEM block.

abmotorman

Nice, thanks for the feedback. andy

ACrooks69

iTrader: (1)

What heads are you going to run and what other modifications are you going to do?

ACrooks69

iTrader: (1)

Oh I now see you have twins. Well you could at least save on half your cams.

79formula

I am running the comp 262 Xtreme Marine flat cam on my Vortec 355. wish I would have went bigger.

abmotorman

Vortec heads modified for the larger lift and port the exhaust side mainly with full roller rocker setup.

Trash

Not running a Comp cams but a Crower hyd roller with 221/230 @.050 thru GLM manifolds, stock elbow/risers and thru hull. Bark at light off is impressive, but is tamed a bit once it stabilizes (EFI motor). Noticeable idle, no reversion noted, docking is fine. I run about 700 rpm idle once warmed up. Cam has a 114 LSA.

abmotorman

That spec is almost the same. What did you do with the ecm? Did you try it without making fuel changes? Oh yeah, what year is yours? Mine are 1998 or 1999 engines. Still need to confirm that.