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-   -   Need help identifying a motor - 572 or 454? (https://www.offshoreonly.com/forums/general-q/338087-need-help-identifying-motor-572-454-a.html)

SB 06-08-2016 09:16 PM

Why are we still mentioning 572 ?

getrdunn 06-08-2016 09:18 PM


Originally Posted by 14 apache (Post 4447736)
How much for the boat? This boat has the name got screwed on it. There is nothing in the picture that shows the guy will spend the money on a 572 zero.

What sucks is some first time buyer will end up with this at some point. I have s feeling it won't be anyone from OSO. :readinghelp::readinghelp::readinghelp:

getrdunn 06-08-2016 09:20 PM


Originally Posted by SB (Post 4447740)
Why are we still mentioning 572 ?

Did we rule this out for certain. I missed a page.

SB 06-08-2016 09:21 PM

I may have missed it, what year, make, model is this boat ?

getrdunn 06-08-2016 09:53 PM

Let's just send a drone over this thing and drop a little c4 care package in it and save the OP his trouble.

ezstriper 06-09-2016 07:25 AM

thats a GM perf parts or truck intake isn't it ? not a merc ?

BlackScorpion 06-09-2016 03:28 PM


Originally Posted by getrdunn (Post 4447716)
Like pretty much everyone else has come to the conclusion I'd bet anything it's a 454. Not real real rigged either. Indication engine prolly was in and out frequently. Salt water boat if I was to guess also. My gut instinct unless you can figure on an engine right from the get go then I'd pass. At times in the past I use to like those sleeper stroked engines with 454-330 stickers however I doubt this be the case. Just looks like a poorly maintained if at all boat with issues that's why it was traded in. Just my 2 cents

Thanks for your comments Getrdunn. I'm curious, what gives you the impression that it was a salt water boat? I'd like to look more into that. Is there some hints that I can look for in a boat?
Also, the dealer told me that it wasn't traded in, it was a boat that the dealer bought from a private seller in Vegas or Nevada or something like that. I can't remember where exactly now.

BlackScorpion 06-09-2016 03:30 PM


Originally Posted by SB (Post 4447745)
I may have missed it, what year, make, model is this boat ?

That's a good question, and believe it or not, the dealer isn't exactly sure either. LOL. I will start a different thread altogether on that question, as I get the feeling that will be an even more fun mystery! LOL.

BlackScorpion 06-09-2016 03:31 PM


Originally Posted by ezstriper (Post 4447850)
thats a GM perf parts or truck intake isn't it ? not a merc ?

Well, based on the side-by-side photo I posted on page 2 of this thread, comparing the mystery motor (left) to the stock L29 Mercruiser 7.4L Magnum (right), they would appear to have the same manifolds...just that the right one has the factory plastic covers on it.

BlackScorpion 06-09-2016 03:52 PM


Originally Posted by getrdunn (Post 4447743)
Did we rule this out for certain. I missed a page.

I don't think it's entirely ruled out yet. I did more research and it would appear that stock 454 block with a standard deck height of 9.80 inches (assuming the Merc blocks are the same or similar to the GM auto/truck big blocks) can be bored/stroked out all the way to 598 cubic inches:

Displacement = Bore x bore x stroke x 0.7854 x number of cylinders
Displacement = 4.5 x 4.5 x 4.5 x 0.7854 x 8
Displacement = 572 ci

Standard Deck Height: 9.80

Bore Stroke Cubic Inches
4.25 4.00 454
4.31 4.00 467
4.31 4.25 496
4.50 4.25 540
4.56 4.25 555
4.60 4.50 565
4.50 4.50 572
4.625 4.25 571
4.56 4.50 588
4.60 4.50 598

The table above is from the good folks at Hot Rod magazine:
http://www.hotrod.com/how-to/engine/...rder-strokers/


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