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Bill,
Back when I was thinking about buying the boat I turned you on to, I threw down the gauntlet about the motor Keith had in it to the "car motor guys" on the site. Here is the feedback. The boys thought that 550hp was not real based on the data Keith provided about his build up.
Greg Guimond 550 HorsepowerDoes this build up have the "good stuff" and is 550 ponies about right?
454cid 550hp Dart Big M Iron block, 9 1/2 to 1 compression, Bravo drive w/shower
Crane hyd roller Cam w/roller lifters & gold roller rockers, Hardin SS sea pump
Manley SS intake valves & Inconel exhaust valves -10hrs on engine fresh water only
Imco exhaust manifolds with SS risers, Cyclone SS mufflers tips, Halon fire system
Holly 830 carb, MSD ign system w/rev limiter & distrib, dual batteries w/switch
05-19-2013, 02:53 PM
Pismo Cam specs? Heads?
05-19-2013, 04:31 PM
gcarter That may be a little high for a 454 running at the engine speeds we need.
05-20-2013, 01:28 PM
Donzi_Dude the first one to make 550HP with a 454 we will call "Hot Sauce".
05-22-2013, 05:49 PM
Pat McPherson
Need to turn high rpm to make 550HPI know a couple of guys that have built marine 454s that dyno'd just over 500 @ 5600. Need to build a 454 to spin over 6000rpm or have a blower on top to get 550.
05-23-2013, 05:08 AM
Donzi_Dude i thinks it possible. you are just having to be "that guy" to do it.
05-23-2013, 06:35 AM
pipnit 550 w a 454 is easy. Go buy some good heads.
05-23-2013, 09:41 AM
Ed Donnelly It might be hard to build one in the the back hills
of Nirvana, but, in the big city with a good engine
builder, its not that hard. Cam, compression, heads,
and manifold.. Try it you'll like it ..Ed
05-23-2013, 10:24 AM
pipnit
It's not hard at all to do, just takes a little coin and some smart thinking. I have a '76 2+3 with a big old honking TRS drive (re: inefficient) with a small block that runs 75mph on a gps on 87 octane. She runs like a top, no detonation, great response and a lot of fun!
To the original poster, you might want to call Bob Madera at Marine Kinetics. He'll give you good advice and could design a 454 which will get you to 550hp easily.
05-23-2013, 01:54 PM
pipnit My point is 550 out of a 454 isn't that difficult. I have seen MANY 454's with that much power and a lot more. If you have the coin, have someone build it for you.
my short list would be a callies, lightweight forged stroker crank
some afr heads
good exhaust
victor intake
pro systems carb
if you can afford the stuff above, you can afford buying a cam and some advice from RMbuilder...
05-23-2013, 03:20 PM
MDonziM Greg, 550hp sounds a little optimistic for 9.6:1 compression. I have well built 454's in my magnum that are 550 to 575hp and that's with 4-5lbs of boost. Without the sc's probably around 450hp. 500 hp should be doable without loosing reliability but beyond that you are trying to 10 10ths out of a marine engine which is not for me. I would rather start with 502ci if 550 hp is your goal. - Marshall