Gm Zz 572
 

Has anybody used the new GM ZZ 572 crate motor in boat yet ? saw article in hotboat in a eliminator

Re: Gm Zz 572
 

I read the same article, and then posted a similar question on the other site {speedwake} about the ZZ572 and got no responses. I have a ZZ502 crate in my boat now and have had good luck with it so far, after about 80 hrs. Like you, wondering how the 572 would be...not for my present 23 ft. boat but possibly a bigger boat down the road.

Must be some kind of voodoo 'bout them GM crate motors no one likes to talk about ;o). Might be some clearence and cam issues?? Think the HB article said the guy had 50 hours on them with no issues......yet.

Re: Gm Zz 572
 

Most people here seem to think auto motors are completely diff. I think if you get a "boat"(no reversion/proper torque range) cam in it and get enough cool oil through it the clearances are good enough. I have heard that since the jacket doesn't get hot like in an auto you might want a little more piston to cyl wall clearance. There are ample examples of "boat" motors going kaboom here but when a car motor fries in a boat people seem to think it's because of it being made for a car. Just be sure to take out the center bypass if it has one on the oil filter mount. BTW I am well aware there are lots of real experts here that know more than me but the only time I have fried an auto mtr in a boat, after about 6 of them, was when I cranked the timing tooooo far without my timing gun handy ,,duh. Just my .02

Re: Gm Zz 572
 

Maybe people just feel better when they pay the upcharge for a "boat" motor?

Re: Gm Zz 572
 

Big differance between a crate production motor and the ZZ572. The 572 is a HP - Race motor with proper set up for running hard. Just my O2.

I agree with cootoys on proper set up and cooling to keep em running strong. GM HP stuff is hard to beat for the price but again just my .02.

I have not tried one in the newer bigger boat yet but back in the day when we ran flaties the LS6 motor and if you were lucky enough to get yoru hands on an L88 or LS7 motor they ran very strong at the time. The 502-502 are in more boats than some think.

Re: Gm Zz 572
 

That could be.

My engine guy's business is a pretty even split between auto and boats. He builds awsome mills for his own dragsters. And does engine work for a lot of the local go fast boat guys. Some with pretty impressive big $ boats.

He doesn't seem to think there's much of a difference as far as the short block is concerned in an "off the shelf" engine. But I suppose if you're looking for optimal performance, or looking at an engine that will be run hard all of the time, rotaing assembley clearences would be an issue. In both marine and auto applications.

I run my ZZ at WOT only once and a while. And generally only for a few minutes at a time. Maybe that's why it's held together and stayed reliable. I suppose if I ran the snot out of it all the time it might be broken by now.

BTW, I don't know chitt compared to most of the OSOers. Like some others I'm here to learn. If I have a ?...I post it. And generally get good feed back.

Re: Gm Zz 572
 

I put one in in March. All I did was re cammed to a Crane 741 and used a Cloyes hex adjust timing set to set intake centerline to 112* as per some recommendations from some very knowledgeable people. There have been some people on other forums that have had problems with breaking valves but I think it was from the long duration stock cam causing reversion problems. I have about 60 hours on mine now. I may pull it this winter just to take a peek and see how everything looks. By the way I removed a ZZ502 with 225 hours to put this 572 in. It was still running great when I removed it.

Re: Gm Zz 572
 

Is the 502 for sale or long gone?

Re: Gm Zz 572
 

Sorry, it now resides in a 69 Camaro

Re: Gm Zz 572
 

230SX, good to hear of the ZZ502's longevity.

I'm guessing you dropped in the 620 hp version? Glad to hear that's working out for you also.

Is there a web site where I can get specs on the 572? I'm able to get general info from the GM site and also Pace Performance. But no particulars on the cam and other internals.

Thanks

Re: Gm Zz 572
 

No worries......It was worth a shot.

Re: Gm Zz 572
 

The new ZZ572/620 is built around an all-new Gen VI tall deck Bow Tie cylinder block. This all new race block is filled with a forged 4340 steel crankshaft with 4.375” stroke, shot peened forged 4340 H-beam rods, and forged aluminum pistons with full floating wrist pins. Plasma-moly rings are standard as is the screened and louvered windage tray. Hard core parts for hard core long term durability.
The redesigned rectangular port aluminum cylinder heads result in a pump gas friendly 9.6:1 compression ratio. A hydraulic roller cam with 0.632 inch lift actuates the stainless steel valves. And, of course, hardened chromemoly retainers, roller rocker arms, and dual valve springs are used to complete the valvetrain.
A new GM tall deck single plane intake manifold and 850 CFM Demon carburetor deliver enough air and fuel to make the 620 horsepower at 5,500 RPM and 650 ft. lbs. of torque at 4,500 RPM. Ignition is handled by a GM HEI distributor.
This impressive big-block engine is pump gas friendly, massive torque and horsepower, all from GM, the ZZ572/620 is for who consider excess to be barely enough and suitable for street/strip applications.
Finally released by GM but gone is the bright red paint and Chevy Bow Tie logo on the valve covers. In are traditional Chevy orange paint and 572 on the valve covers.
12499190 Partial Engine (Short-Block) 12498792 Base Engine (Long-Block) 12498793 Premium Engine
572 C.I.D. - 9.6:1 Compression Crate Engine Technical Information
Horsepower 620 @ 5500 RPM
Torque 650 Ft. Lbs. @ 4500 RPM
Max. Recommended RPM 6000 RPM
Compression Ratio 9.6:1
Bore 4.560”
Stroke 4.375”
Ignition Timing 36° total advance
Fuel 92 Octane
12499190 Short-Block Components
Rear Main Seal New! One-piece design
Block 25534368 - Sportsman Tall Deck Bow Tie Gen VI, 10.200” Deck Height
Crankshaft 88961554 - Forged 4340 steel
Connecting Rods 88962926 - Forged 4340 steel, H-beam style, Shot peened
Pistons 88962925 - Forged Aluminum, Full Floating Wrist Pin
Piston Rings 12499212 - STD size premium plasma-moly
Main Bearings 88962212 - STD size premium main bearing kit.
Rod Bearings 88961556 - STD size premium rod bering kit.
Cam Bearings 12499434 - STD size premium cam bering kit.
12498792 Long-Block Components (Short-Block Components Plus The Following:)
Camshaft 88961557 - Hydraulic Roller (Valve lift: .632” I, .632” E; Duration @ .050” 254° I, 264° E)
Lifters 17120060 - Hydraulic Roller Tappet
Cylinder Heads 12499255 - Aluminum rectangular port, 118cc combustion chamber
Head Gaskets 88961561
Intake Valves 12366987 - 2.25” Stainless steel
Exhaust Valves 88963128 - 1.88” Stainless steel
Valve Springs 88963934 - Dual valve springs, 1.564” coil dia., 1.800” installed height, 197 Lbs. seat pressure
Valve Spring Retainers 12366990 - Hardened chrome moly steel
Valve Retainer Key 12366992
Rocker Arms
12361323 - Aluminum roller rockers, 1.7:1 ratio
Push Rods Intake 88961559 - High performance one piece
Push Rods Exhaust 88961558 - High performance one piece
Valve Covers 12499200 - Special 572, Orange Powder Coat
Damper 88962814 - High RPM torsional damper SFI approved, 8”.
Oil Pan 88963707
Windage Tray New! Screened and louvered
Oil Pan Gasket 10106407
Oil Pump 88963707
Spark Plug 05613878 - R45XLS
12498827 Premium Engine (Long-Block Components Plus The Following:)
Intake Manifold 88961161 - Aluminum tall deck single plane, 4150 series carburetor.
Carburetor 88961560 - 850 cfm Demon, mechanical secondary
Distributor 88961867 - HEI
Water Pump 14058915 - Aluminum, Short Style
Flex Plate 12561217 - Special 572, Automatic Transmission
Intake Gasket 88962213 - Gasket, Intake Manifold
Spark Plug Wires 12499211 - Red
Plug Wire Looms 12495502 - Black Wire Loom Kit

Re: Gm Zz 572
 

thanks bpine, where'd ya get that?

Re: Gm Zz 572
 

A Cam change for sure...valves and springs too, not to mention fatting up the mains a bit, MSD dist. too, and I would think it will work at 5200rpm for a while.

bpine, great info but you missed this...$12,995.00

Re: Gm Zz 572
 

This was a little piece of info from a post RAYLAR did a month or so ago.

Thought I would chime in with some facts. The ZZ572 crate engines are a GM High Performance creation. The engine is machined and assembled outside of Detroit by a company called P.A.S. whcih is a joint venture by Rousch Industries and the Unibore Company. The blocks are tall deck Merlin castings. The pistons are forged J&E, the rods and Cranks come from Callies and the heads are by Edelbrock.

The rest of the post was not to kind to the motor being used in a boat.

Re: Gm Zz 572
 

Any one know who Unibore Co is?
When I bought a GM pro stock block, included in the paper work was a sonic test and clearance sheet from Unibore.
As far as the 572 motor goes... I would invest in a gasket set and pull that puppy apart and double check everything!!! But for the money and with those quality parts it seems like a pretty good deal.
The pro stock block is advertised by GM as being cnc machined and ready to assemble. Not quite true. I suppose I could have run it, but after inspection decks were out .005 corner to corner so I decked it to put the pistons .005 in the hole and I decided to line hone prior to boring just to make sure everything was square and straight and be able to use std bearings. But I guess I may be over anal.

Re: Gm Zz 572
 

Re: Gm Zz 572
 

Hot Rod Magazine had a pretty decent article on those motors, think it was August issue.

Re: Gm Zz 572
 

Wish I had pulled mine down from new and checked clearances etc.
Had problems with oil pressure from start.
Very bouncy timing mark also ? maybe from oil pump.
Raced it last weekend, 1st time since taking it out of crate, and now have sump full of metal :mad:
GM ZZ 572 720 HP

Re: Gm Zz 572
 

run a search on here, Jeffrey cheng put the 572's in his gladiator and it seemed to do fine, almost 100 right out the box, he did change valves and "marinized" it.