Cam selection

[565edge]

Got my cam in the mail today.What do you guys think.How about the overlap and cam size.The cam is for a 11 to 1 comp 565" chevy going in a 22' daytna sterndrive boat.How much rpm will this idle at?What about reversion with lightning headers--water jacketed.
This is the cam card.
duration at .050 is 262-272
lobe lift-- .4100
lobe seperation--114
timing events at .050--open/close intake--19/63
open/close exhaust---72/20
seat duration at .020--296/306
gross valve lift--697-697
valve lash hot .029 intake--.030 exhaust.
This is a custom grind solid roller from bullet cams.I kept the lift down for spring life.The rockers are 1.7.Where will this cam make power at.The carb is a 1195 king demon and the intake is a brodix hv2001.

[77charger]

I would talk to an engine builder who does boat motors that use I/Os.I am pretty sure they use a different set up vs jet or light v drive.

[77charger]

I think on a bravo type drive you want it to idle under 1k no more than that

[Infomaniac]

I am going to guess that cam in a 565 will peak power somewhere around 6,400 RPM maybe a bit higher. I doubt whether you will spin it that much but there are other considerations.
Some of the big name sterndrive engine builders use a cam that is bigger or peaks power higher than where it is actually used. I cannot speak for them but I think some of them do that to limit the torque a bit to save the drive. Cannot put engines out there and expect to sell a lot of them if they kill the drive instantly. Also sometimes a cam that is a bit big for the application will make more power at 5,300 RPM than a cam that peaks power at 5,300 RPM. Just for example.
As far as the selection. I would probably run a 110 or 112 LSA cam on an N/A deal but 114 will not kill you.
Are your lightnings reduced water versions? It should idle 800 -900 RPM.

[565edge]

They actually wanted the cam on a 112 lobe seperation but i was worried about reversion.My headers are not the dry ones.I am going to run another water dump to help get rid of the water.

[Infomaniac]

The reduced water lightnings have a 1/2 NPT bung where the water enters the exhaust to dump overboard. the outlets in the exhaust stream are only 3/16" and there are only about 6 of them in each header. You might be able to do that yourself.

[cstraub]

What cylinder head is on the boat? Cam seems big to me unless it has OEM type heads.
Chris

[565edge]

The heads are dart cnc ported 355 pro-1's.I would of been better off with a smaller head but this is what i already had.Dont you have a cam program?Let me know what you think it should be?Im sure i will be playing around with it some.The bore is 4.600 and stroke is 4.25".Thanks