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540 stroker,,DUD engine, dont do it.

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Old 03-31-2009, 10:37 AM
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You guys get to do that!!
OK Dean now i see how you are
Sounds like theres room for Pitbull is Arizona
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Old 03-31-2009, 12:11 PM
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I run a gen 5, 509ci and it made 660hp,it only has 30hrs on it but runs strong so far,just did a custom cam from bob madera this winter,runs even better now,it has some big heads on it and also pretty stout camshaft.
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Old 03-31-2009, 06:06 PM
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Engine builders or MARINE engine builders??????

The 540 is more capable of making more hp and torque than a 509.
he is talking about the short deck block 502 being built as a 540, I have heard the same it will have piston wear early, you I think are talking about the tall deck block which is good for 540 and will make more power. griff after reading the whole thread I quess it means all 540s are less powerfull ha hahhah and I was told wrong by a friend 2 weeks ago o boy. well I quess my 509 will be a DEAN GELLNER 540 next winter if he thinks it needs it but its only got 30hrs since last rebuild and the 572 of his will be going in next. boy this was a interesting thread.

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Old 03-31-2009, 06:16 PM
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Ofcourse if you have one or build them to sell you wont agree. But if you build BB chevy day in and out for 30 years. Dynoing them as well as taking them apart years later to freshen them you know a 540 wont make the 30 hp more it should then a 509 and will have more wear if built the same way. Not saying a 540 is junk and ofcourse it will run well but hands down the 502 is a better stroke.
The program used is used by Gale Banks and he swear by it. As far as the guys who agree with me on this, most of them asked me not drop there names. Top notch marine engine builders in NY are in a small circle. Look at Mercruisers 540 bulldog @ 470 pshp. the 500Hp is the same pshp with SLIGHTLY more compression. Why is the 500HP the choice for racing over the 540??? Call Mercruiser and get a good honest tech on the line. See what he says. I rest my case.
that 540 is a long block and has a smaller cam non roller then the 502. a long deck 540 will make more power than a 502 short deck same cam, comp, I was told not to turn my 509 into a 540, but a 522 I think and it would last longer maybe the guy was wrong I talked to. oh well as above stated I will be going 540 ha haha

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Old 03-31-2009, 06:44 PM
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mrhp, Your first post gives me the impression that you do bench work on a pic nic table in a back yard full of farm animals. And you agree with me by telling me I know the answer.. Your second post you agree again with what I said about 557s. Which proves my point. You have been building 557 FOR YEARS you say. Whats the problem? You haven't moved on to the next thing. I own a 7000 sq ft Mercedes Benz repair shop with 9 lifts that I built from the ground up. I rebuild MB engines and transmissions in house. Got a 4,000 lb 99 e class to run 10.60s. Got my Harley to run 12.0s.and my daily driven pick up in the low 12 as well. Not saying I am an expert marine engine builder. But I know how to make things work. There are a lot of engine builders that go through life thinking bigger is better,and more is better. Only because there not smart enough to read, learn or question others.Go ahead be a follower and keep building the same thing you have been. Good engine builders evolve to new things.
MR. HORSEPOWER 1 was the youngest person to get a PRO STOCK lincense in the 90s, and has built a lot of fine race boat/race car/ pokerrun/ engines and has been in the mags in book stores. HE IS BUILDING ME A 572 BLOWER MOTOR AS WE SPEAK. I quess I herd wrong about the 9.8 blocks, thats why I have a new engine builder as in him,
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Old 03-31-2009, 06:59 PM
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Okay so I'm not sure what to do now, I've got 500 bulldogs with 70hrs on them, should I send them to Pit Bull and get them refreshed before this summer or I am I safe to run them for another season.

If I do get them freshened and put a mercedees benz fuel injection system on and the black plastic covers from a 500 SL AMG would that get my boat to break 100, of course that is assuming I put 45 inch 6 blade herring's on my bravo's to handle the horse power gain.

Would I also have to run a synthetic oil because of the new fuel injection.

My Hull is very AERODYNAMIC so I think this is possible what do you guys think.

These threads seem to raise so many questions
hey when you go to change the springs after 300hrs, talk to dean about his intake/carb/ cam combo it will be just as reliable but 725 hp if I was you I would do it now with 70hours. your merc 540 500hp is a lot better than my hp500 502 was.

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Old 05-31-2009, 09:09 AM
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so what is the good summary here ?

reliable 600hp - NA - pump gas -540 stroked 502

what cam
what intake
what rods
what pistons
stock heads?

Thanks as always experts.
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Old 12-24-2012, 11:37 AM
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Default yea what he said

How do you get to 600 hp?
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Old 12-24-2012, 11:48 AM
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Default Sorry Old thread

I don't know how I stumbled on this old thread. Whooopppss
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Old 12-24-2012, 04:03 PM
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I don't know how I stumbled on this old thread. Whooopppss
Oldie but a good read for us 540 types . I thought RM Builders' formula was da chit . Very intelligent man .
PS: Good stumble
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