Need help identifying a motor - 572 or 454?
06-08-2016, 09:16 PM
#31
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Why are we still mentioning 572 ?
06-08-2016, 09:21 PM
#34
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I may have missed it, what year, make, model is this boat ?
06-09-2016, 03:28 PM
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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
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.
06-09-2016, 03:30 PM
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06-09-2016, 03:31 PM
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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.
06-09-2016, 03:52 PM
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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/
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/
