What type of cam profile should I be looking for to be in the 325-350 hp range.

Thanks for all the great info.

I suggest contacting Comp Cams and telling them you want a camshaft with the above specs and a 110 LSA.This will get you 325 -330 horsepower @ 5000 rpm with a smooth running engine and acceptable fuel economy.
Dennis Moore

what do you think of some of the newer Marine cams I listed from Comp??

I think they are fine but they are also flat lifter cams. If you have a roller cam engine I strongly suggest you install a roller camshaft/lifters for better durability.
Maximum camshaft for a 350 would be 224/230 intake/exhaust duration @ .050 with a 110 LSA but you will need to twist the engine to 5200-5500 RPM for maximum performance. You might get 350 horsepower with this camshaft...
Dennis Moore

LSA 110 or 112
 

Dennis,

I have always thought that 112 LSA was the safest to avoid reversion?

Unless you run long risers to dump the water as far back in the exhaust flow.

Just wondering

I'm just wondering if you are the same guy that wrote the books on marine performance engines?

Sounds like him with his cam info and rpm ranges.

Very good books Dennis !

I may not agree with everything you say/recommend/etc cam wise / power wise / etc but your books are really well done. Very good resources for most everyone. Wholly crap are they worth alot now since publishing has ceased.

That said, for shelf cams, the Hot Cam and Comp XM270HR (I'd rather the XM) have been time proven for power, idle, mileage, etc,etc for everyday driving 5.7's with Vortec and other typical performance heads. They idle great and pull to 5000-5200rpm.
383's will need a little more cam, like the 224,230 that DM mentions. Or bigger of course if a 'more juiced' build. More power than the typicals, a wise call would be to RMBuilder.

I experimented a little a few years ago and installed the Comp XM EFI cam with 218,224" at .050" , .575 lift, 113LSA on bone stock '91 Merc 5.7L , and installed BrodixIK180 heads/w beehives, etc,etc. 52-55 (55 was best)stockmph, 65-68mph
(68.1 was best) after. Idle like stock, brutal acceleration out of hole, and very good top end. Both Engine Versions used Eddie Marine exhaust.

Experimentation was really just the 113LSA. Normally I'm like Dennis where I like the tighter LSA's on small blocks, but I've found with good heads we don't have to run our chances of poorer idle, reversion chances, etc, etc that a tighter LSA will give. I still would not go wider than 112LSA for pretty much anybuild. Of course if building 'all out' we throw all compromises out the window and give the motor everything it needs. Alpha's need not apply. LOL.

Anyhow, if anyone wants to hang (online) with a big group of smaller deep vee I/O boats with single small block engines from 50mph's to 80+mph's, send me a PM and I'll direct you to where they are. Never any BS (weird I know) and always willing to help (with actual experiences) when they are around.

I can't send pm's. So where is this hangout ?I swear I have been everywhere online lol. Run a lil 185xlt powerplay w/ 13.1 428 abc/ alpha ss.

Thanks!

I am going to give rmbuilder a call to see what he recomends for a cam. I am going to stick with the roller setup because I am using the whole vortec block not just the heads. I will post his reply.

Now if you aren't Tdaddy shoot me dead. LOL.

You already hang out there and you're pretty much on top.

"It's a small block nation" - Tdaddy

- CFM (SB here)