427 marine cam specs

[GJCAT427]

I`m gonna do a 410 build for my latest project. A 56 COE that will be used to haul my toy trailer (think Battlestar Galactic). I`m using a 5 speed over drive Clark tranny and the 2 speed rear that's in the truck. I`m thinking that the 427 marine cam should have plenty of torque to handle this setup. Right now its got a very tired 390 merc in it and the previous owner told me it would move down the highway at a cool 65-70 mph with the race car they towed behind it on the flats. I`m thinking the marine cam should do fine in the 410 and still not rev to high when tackling the hills on some trips. What I need is the marine specs so I can calculate what my compression and gearing should be.

[cammerfe]

Instead of using a performance-designed cam from about fifty years ago, how about going to one of the cam grinders who offer personalized suggestion. You can tell because they'll ask a massive multitude of questions regarding other engine features and also all about the vehicle and its characteristics. You might be a bit surprised but you'll be ultimately gratified.

As an example, I asked at Comp Cams for a stick that'd duplicate the street manners of the '64 427 I bought new. This to go in a much-modified 390 for the street. Their suggestion was a 242-248 at .050, 110 centers, and .660 lift. I thought that combo sounded pretty rowdy but when fired, it idled at about 850 RPM. It'd run right past 7K before it started to flatten out, and pull starting about 1K-1100.

Trust your supplier.

KS

[TorinoBP88]

One comment about marine cams: they were/are intended for long hours at mid to high rpm use, ppunding the RPM from mid to high to mid to high as the boat pounds the waves, so they are sometimes easier on valve trian/valve springs then some of the bumpier cams sold today, less likely to float, and with HD springs. 

I'm not saying its better or worse, but a comment. 

Years ago i hot-rodded a Honda XR650, and I went with the HRC Honda team desert Baja 500 cam because then did not increase lift much, but increase duration with a long smooth valve action - I was putting a lot of hwy miles on the engine and did not want the valves hitting the seat so hard.

I would call Ken at Oregon cams, get a custom cam for your use and personal interest.

[gt350hr]

   390 GT cam.