ooops..double post

I saw that must be dry pipes or? Like I said I'm not a motor guru I have just been wondering why these bigger engine didn't produce more power, I have noticed alot of engine listed from several builder that 620 to 650 is the horsepower rating, maybe the key to that is reliability , trouble free or big horsepower and broken springs, push rods or worse so who knows but i have a pm from bob and will be getting in touch with him after I get all my specs, I've never spent a dollar with Eddie young but I called him and he is a top notch good guy, he treated me as I was a long time friend so he's got my buisness in the near future.

Its plain to see that there are only (2) REAL WORLD, FIRST CLASS, ALL KNOWING CAM GURU'S. 1 begins with Pole and ends with smoker the other starts with C ends with slob....that is if you want BS. If you want a real world custom cam that will match your application down to the boat, exhaust, heads, drives, ect, ect. then save some time and call..... B O B.

He WILL NOT post hi cam #'s as they are proprietary and if there were ABC cams we (the good guys) would of only used him once or twice not for years.

Do off the shelf cams work? Sure some do. Do they work for all applications? No only the one they were designed for. The last shelf cam I bought was for a 365 Merc Mag it was for a stock build and worked well.

How do the good guys know whats works..........they have 1 of these.

Everyone has never paid attention to the original question ( which is what cam is everyone running on 540plus ci 700plus n/a engines) i was curious about others peoples not mine, only a few people caught the question everybody else started talking about my build hell i was looking for what everybody else was doing just comparing notes, ive talked to bob before and hes the man with the plan, ive started noticing everyone seems to be rude towards people on here anymore, this site was built to help each other out, if you cant help someone with out blowing a fuse and start *****ing about someone else then maybe your not for this site. We all come on here looking for advise some we beleive some goes in one ear and out the other. But before anyone starts answering maybe reading the question thru out would keep it at a simple level.

Johnny, the key to making X amount of HP per ci, is in the induction. I am pretty sure the cylinder heads you purchased from Mike Tkach, are not 355cc? I could have sworn they were reg BB2 heads or bb2 plus. They are older heads, and I am pretty sure they are good heads from a quality standpoint, and work well with a power added like Haxby stated earlier in the thread. 620HP isn't steller, but it isn't a absolute turd either. Probably about where one could be using as cast performance heads, with a shelf style hyd roller camshaft. Your still making a little better than 1.1HP per cubic inch. That would be comparable to a 454 making 500HP.

With that being said, my honest opinion, if 700HP or better is what you seek, you're gonna need to make some changes, probably in both camshaft, and cylinder heads, possibly intake. Whether it be doing some porting on those current heads by a good head specialist, or replacing them all together. You start getting into 1.3HP per ci, things start becoming more and more important as far as head flow, design, valvetrain dynamics, and the rest of the induction. If it was as simple as bolting parts on a shortblock and making huge numbers, well, we all would have 700+hp 540's that idle like stockers and live a long valvetrain life.

Dealing with Eddie or Bob madera is a win. They have proven recipes that work, and work well.

And most of my engine builder customers have that along with a full shop to do the work needed to make the numbers the engine needs to make. Some have multiple dyno and huge R&D budgets like ATK North America.

You asked what size cam is needed and I posted one. Heads with excellent low to mid lift numbers in these marine engines and the rpm they run will not require large cams to make decent power.

What good is knowing cam specs for an engine that has no relation to yours? What are you trying to compare, and how would you even compare it if you don't know what you have in yours? It seems like you started this thread to take a poke at Mike, and you obviously aren't concerned with making more HP, if possible, with yours because you won't answer the questions necessary to help you. This whole thread is a joke.

and the one you posted, if used with wet exhaust will revert all day long.

Unless lucky enough it sucks a seagull back in and stalls the motor before the water does.