Better cam
 

Which would be the better cam for a 540-555 build? A lunati 245/250 duration and 629 lift 112 lsa or a 741 298/306 610/632 112 lsa. Which would make more torque and hp and live the longest?

10:1 555ci, with Dart heads, my opinion, 741 cam is too small. Especially for a twin engine setup, going into a 28 pantera. That cam will not get you to your HP goal of 700.

If those were my only two options, I'd go with the Lunati.

What off the shelf cam would you suggest?

Exhaust is as big a factor as the others. ? Running dry to the tip. Ect

Yes

Call Bob Madera and have the cam build just for your needs.

Those cams are no where near big enough for that cube engine.

Twin engine 28FT vee bottom, twin 555ci , I certainly don't think you need "max low rpm grunt" short duration cam at the expense of upper RPM power. Now, if you had a 43 Scarab , things might be a little different.

Considering the 28 Pantera came available with a single HP500, I certainly dont think having say, 1200ftlbs of torque total, instead of 1300, is going to make the boat a slug accelerating from 50-90. Having 1400HP total, will certainly make a faster boat, than 1250hp total, in your case.

From what I recall, you have a 10:1, Dart 310 Pro 1 heads, Dart Single plane intakes, and looking for 700hp . i'd be looking at something like this myself. But I would call howards, and get it in billet with an iron gear . Assuming you are willing to spin the engine to 5800-6000 rpm wide open. If only 5500, than these would be a little big.

http://www.competitionproducts.com/H.../#.V4D9iKLLpwM

http://www.competitionproducts.com/H.../#.V4D_yKLLpwM

These numbers are based off what I have for Dart 310 Flow data, and what my cam software and simulation software trend towards, as well as the handful of similar engines I've been around the dyno with.

What heads are you going with?

310 dart pro ones

When u get a chance post your other components. intake, carb, heads, comp ratio etc.

Dart blocks, dart single plane intake, not sure on compression yet but possibly 10:1, hopefully lower though and Holley carb

Will the heads be ported and flowed? Out of the box they are questionable and need a little help. Don't get me wrong they are a fine head. I have them myself on 496's and will probably use them on my new 555's. There are a lot of off the shelf cams. Surprisingly howards has some pretty good choices over others. I'm looking at some 236/242-670/660 on a 112 that is similar cam valako is currently using in his 555 making 785 hp at 6,000.

I doubt head porting is in my budget.

I understand. Gellner Racing was pumping out 540's with your combo including out of the box 310 heads and a 244/248-640/648 on a 111. Pretty conservative package making a respectable 650 plus hp. If you'd like cam card pm me.

If Jim V is making nearly 800HP at at 6000 from a 555ci, with a shorter cam than a 525 EFI cam, I need to get on his program. I've seen full CNC ported 572/598 combos, with a ton more cam, barely make that power.

I just want those guys to calibrate my dyno.:D

Actually 565. My bad.

Tunnel ram with 4150 1000 cfm carbs

Bob is not God, I learned that when my cams are horrible for my combo... 630 hp with a 540 and Afr heads with bobs cam... By far not impressive at all!

Wow that's a smaller cam then mine and I'm over 100 hp off!

Bob is not God, I learned that when my cams are horrible for my combo... 630 hp with a 540 and Afr heads with bobs cam... By far not impressive at all!

I didn't give valakos exact specs especially on the lift. Not really my place. But I will say he makes great power with shorter duration higher lift cams. It works very very well with his combo especially with his heads. Superior flowing heads don't necessarily like big cams. Just depends on what the application is for. You'll get yours figured out when time permits. I can understand your frustration. I've been there.

Tom Airharts dyno.

Think about the differences in motors and cams for a few.

Jim's 27 non stepped Fountain does 98 mph, I think it's safe to say it's making the power Getrdunn claims.

Here is the video of Jim doing 98.

https://youtu.be/e_8c5tyH9VE

15CI is 120 hp?

http://www.offshoreonly.com/forums/g...-784-hp-2.html

Looks like it made its peak power at 5750. Id like to think the tunnel ram intake is helping it carry rpm a little too.

All nicely done under 6k with duration similar to 741 cam. Most wouldn't believe it but that's ok. I've been in it and along side of it. I'd like to have had that engine in my old original 28' single saber.