Trash

This cam is the stock cam on many Merc motors. My 1995 350 Mag EFI/MP had this cam. In spite of the 109 LSA it doesn't cause reversion. The LSA coupled with intake/exhaust overlap events and overall duration duration influence reversion. The duration on that cam is very very mild.

79formula

I have been told .480 is the limit stock. I have heard of guys running ls6 beehive valvesprings to get over .500 with no machine work.

Mr Maine

Many good suggestions here. Don't count out a gm lt4 hot cam. Roller lifter 112 separation 218/228 at .050 and .525 lift with 1.6:1 rockers. Beehive springs require no machine work. This makes very good power on a vortec 350 as .525 lift is where they make max flow. I have turned mine 5200 to 5700 depending on prop but have settled in at 5200. I gained about 1000 rpm over original motor before repropping so this isnt bench racing

Trash

Although it would require some machine work due to lift on a Vortec head another cam option is the Crower LM00483, similar to the LT4 but on a 114 lsa and its .221/.230 with .525/.545" on a 1.5 rocker.

sprink58

I thought long and hard about mine before I pulled the trigger on it. I wanted to be able to spin past 5000 RPM making power but without giving up low end torque.

The Comp Xtreme Marine 270 Roller worked out well in my application. In a twin engine application I am really pleased with the torque these engines build below 3000 RPM. With 23" Mirage props running thru Bravo One 1.5 ratio drives in a fully fueled 6000# boat I can run 35 MPH at 2000 RPM and 50 MPH at 3000 RPM !! That's not even into the secondaries of the carburetors!! The specs on these cams are:

Grind Number XM270HR

Lift Intake .495 Exhaust .503
Duration Intake 270* Exhaust 276*
Lobe Separation 112*

I am running Comp Needle Bearing 1.5 Roller rockers and make power thru 5500 RPM which seems to be a good all around set up for me. The combination of Vortec Heads with Roller Cams really gives the man utilizing Small Block Chevy's many options to push power and torque well above the 400 mark with ease. Technology moves ahead!!

Pliant

Ive went back and fixed the link, Have a read a very well articulated thread on lift with vortec's...ls6 springs...compcams 050 retainers and your good to go.

http://www.pacificp.com/forum/viewto...38779cfdf2de0e

Trash

Best of luck. I would be careful about spring selection and proper seat and open pressure with the higher lift roller cams.