my bob mandura cam he specked for my 598 was lot smaller than that , its for sale cheap brand new . in box id have to dig it out to give final specs .. 254 260 632 lift maybe not sure though 10 to 1 , dart 345 s . dart block . close to same as you

What did the boat not do good before? Top speed? Anyone out there with same boat as yours to compare some numbers? Don't over cam it if you only want to spin it to 5400. What other parts you have in the motor? Crank Rods?

Think its to much camshaft for his exhaust would need a good header on it.

I don't. He has a head with a small csa. The larger cam will help carry the torque with the smaller head. Anything smaller than that I think he will end up with a turd.

Sounds like a nice cam for a 454

I tried several different cams in my 598, all solid rollers. It depends on what you're wanting to do with the boat, enjoy the day with the wife and kids or go to the shootouts and see if it stays together. You may be looking at more than just a cam change, valve springs, push rods, rockers, more detail may help.

Thanks for all of the advise. I have no issue with running it above 5400. The engine was just torn down on Friday. The engine builder said it had a Callies crank, good rods etc. It needs bored out a little and he will get custom pistons for it. I'm waiting until next week to get specifics of the cam and top end as well as the rest of the components will be cleaned up and checked for problems. The engine shop is well known for their marine engines and I will get their recommendations as to how to build it hopefully soon.

Hopefully they can go 4.610 and leave a little for the next time.

That is what the builder said he plans on doing.

If I had to bet I would say he might be off with his memory. Just a guess... Would be interesting to see what cam card says. I can't imagine cam that size in a 598 performance engine.