Need help identifying a motor - 572 or 454?
 

Hi everyone,
Long time reader, first time poster here.
I'm interested in buying a particular used offshore boat from the 1980s.
This boat is a bit of an anomaly (I'll probably have more questions about it later), but based on the photos looks in fair shape...at least fair enough to get me to go see it in person.

Here's the part I'm having doubts about. The current seller (a used boat dealer) says that the previous owner put a "new 572" motor in it 2 years ago.
I asked for a photo of the motor, and to me it looks like a L29 Mercruiser 7.4L (454) from the late 1990s, with the plastic covers removed.
I was able to identify that unique looking intake manifold and the exhaust risers which look JUST like the stock 7.4L units in the photo below.
I'd like to post a photo, but I'm a newbie and not allowed. However, here's a link to what a normal 7.4L looks like complete with the covers on it.

https://i.ytimg.com/vi/DjKNG7LhOao/maxresdefault.jpg


My question: is there any chance that someone could take a 572 block and put those L29 454 heads/intake/exhaust on it? I've heard it could be done with a 502 block, but a 572 block?
Is there such a thing as an old school 572 block? I always assumed that when someone says 572, they're talking about the hot rod crate motor ZZ572 from GM...
I hope it's not an old Cadillac block...

I welcome all opinions... I'm a newbie...Either way, I'm going to go check it out tomorrow to see if I can find the block ID numbers and finally settle it....

Thanks!

I totally agree with you already mentioning for checking - on the side of the blocks GM has their number codes - run that number and it will tell you what the block is.

I doubt its a 572 a 572 would be a tall deck intake would need spacers.

My guess would be a typo for a 502, which is still a good motor.

unless its a 4.375 x 4.560 bore short deck.

If someone did put a 572 shortblock , under those L29 heads/intake setup, they need to lay off the drugs :bong:

post the 8 diget number that is cast into the flywheel area and i will tell you what block you have.i doubt it is a 572.

Puff puff give.

Tell the used boat dealer he should sell what he's best at. Jokes. What a Joker.

You can post pics on a remote site like Photobucket or wherever and link it back here.

Yup. Classic case of someone asking for more toke, I mean torque, no I mean toke, Ha !

Anything is possible but doubtful. You had me at used boat dealer. Ha. Like MT said its not out of realm to build a short deck 572 or get a mail order. Companies are all over the place but the L29 heads is almost a dead giveaway. But then again I've seen some joe dirts buddies builds who really do need to lay off the pipe and go back to go carts.