The Chevy 572 Crate Motors in the Gladiator
 

Re: The Chevy 572 Crate Motors in the Gladiator
 

Here ya go Jeffrey. A couple of the other pics that show off your bad a$$ ride! :drink:

Re: The Chevy 572 Crate Motors in the Gladiator
 

They would look much better with my name laser etched into the breathers! :D

Nice work JC.

Re: The Chevy 572 Crate Motors in the Gladiator
 

How fast is that boat now? how much did you gain from the other motor's? I am looking at new boats but unsure of power yet Ilmor custom or something like you have done.
I currently have a Cig but looking at 33 Eliminator or 32 Spectre.

Re: The Chevy 572 Crate Motors in the Gladiator
 

Only nice if it works Chad! :)

Re: The Chevy 572 Crate Motors in the Gladiator
 

The jury is still out on top speed. Yesterday was the first break in day. The boat ran 88.9 on GPS with 500EFI's in freshwater. I am guessing that these motors put out somewhere around 650hp each. The extra 300+hp should get me into the mid to high 90mph range.

Re: The Chevy 572 Crate Motors in the Gladiator
 

Any changes to the cam or anything to marinize?

To cover reversion issues and so forth?

Re: The Chevy 572 Crate Motors in the Gladiator
 

Don't think Pfaff changed the cam. Didnt have any signs of reversion after Saturday's run. Time will tell ...

Re: The Chevy 572 Crate Motors in the Gladiator
 

That looks great Jeffrey!!!

I have been running zz502/502's for the last 2 1/2 years on my Bullet with no problems, but they had been modified with cam, intake, valves and carb change. A leak down test was done yesterday for the new owner and....after 118 hours...no issues whatsoever.

Re: The Chevy 572 Crate Motors in the Gladiator
 

no one asked you what your running, nor does anyone care.. you dont even own that boat anymore... move on to the future, and your future is lots of fuel, and lots of oil changes... your buddy dave

Re: The Chevy 572 Crate Motors in the Gladiator
 

Glad to know were all friends around here! :D

Re: The Chevy 572 Crate Motors in the Gladiator
 

118 hours in 2-1/2 years............ Slacker. :D

Re: The Chevy 572 Crate Motors in the Gladiator
 

I thought I saw one of those 572's at the Miami show, except EFI. Doug

Re: The Chevy 572 Crate Motors in the Gladiator
 

Maybe someone converted one to an EFI system. Don't think GM has built an EFI version yet.

Re: The Chevy 572 Crate Motors in the Gladiator
 

A couple more photos ...

Re: The Chevy 572 Crate Motors in the Gladiator
 

Jeffrey,

Did you have to have different tails fabbed up for the exhaust?

Great conversion to the 572's! Can't wait to hear if they remain reliable or not. :D

Re: The Chevy 572 Crate Motors in the Gladiator
 

No. Used the headers and tailpipes that fit on the 500EFIs.

Re: The Chevy 572 Crate Motors in the Gladiator
 

No adjustments needed for the tall decks??

Re: The Chevy 572 Crate Motors in the Gladiator
 

GM has not offered the 572 Crate engines with fuel injection. They offer a low crompression ratio engine, and a high compression ratio engine. They have a few other offerings up their sleeves that they are working on.

Re: The Chevy 572 Crate Motors in the Gladiator
 

Nope.

Re: The Chevy 572 Crate Motors in the Gladiator
 

Arizona speed and marine has an EFI setup for those engines, nice package

Re: The Chevy 572 Crate Motors in the Gladiator
 

Two for two today. Second time out and second time back! :) Ran another 40 or so miles today and the motors ran well. Still running my 30 pitch props during the "break in" period. Ran it up to 5200+ for a stint and was running in the low 80's. Not enough prop. I figure I will need a set of 34's to tap 100 when I am ready to go for it.

Re: The Chevy 572 Crate Motors in the Gladiator
 

jeffrey, how many rpm will those gm 572's rev after they're broken in?

Re: The Chevy 572 Crate Motors in the Gladiator
 

5400rpm. I ran the heck out of them last week. All the way to San Diego, in and around San Diego, and all the way home. Probably 220+ miles over four days. Engines ran perfectly with the exception of the carbs which need adjusting/modifying. The Demon carbs that come stock on the motors are not marine carbs. The floats inside the bowls bounce around like heck in rough water which makes the engines load when flying off swells. Normal boating in flat water has no effect on them but if you launch it - the engines gurgle due to the excess fuel.

I am testing props right now. Have a set of 32s on the boat that are too small pitch-wise. I think I need 34s or need to do a gear ratio change from 1.5 to 1.36. Do not like the idea of running 34s due to the load they place on the drives, etc. I can easily spin the 32s to 5400. Was running about 86-87 with the 32s. If I can spin the 34s to the same rpm I should be well into the mid-90's.

So far so good!

Re: The Chevy 572 Crate Motors in the Gladiator
 

Sounds great.

Keep us updated with how the big chevys are doing.

These look like a great way to go for 600 + hp w/o going apesh*t on blowers etc.

The secret is to do the right clerancing/set-up before installing. The components in the engines are top notch.

Wannabe

Re: The Chevy 572 Crate Motors in the Gladiator
 

JC,
How are they running? Did you ever get the right props dialed in?? Looking forward to seeing some running shots from the SCOPE poker run.

Craig

Re: The Chevy 572 Crate Motors in the Gladiator
 

I am interested in how you dealt with the fuel float bouncing.

Re: The Chevy 572 Crate Motors in the Gladiator
 

I have been looking into using one of these bad boys I heard there was some exhaust valve issues, was that part of the clearance problem or was that simply reverson?
Could you tell me what I should pay particular attention to if I buy one of these ?
Sounds like a sea demon would help

Re: The Chevy 572 Crate Motors in the Gladiator
 

Haven't received the parts yet from the Barry Grant guys. They are supposed to be sending some small pieces that are in their marien carbs that are not on the car versions. However, it has not really been an issue since that one severly rough day in San Diego. Running in average conditions doesn't affect it.

Re: The Chevy 572 Crate Motors in the Gladiator
 

The valve guides do neet to be honed due to the different tolerances between and automotive and marine application. The work that Paul Pfaff did cost about $2500 per motor. I have had no issue with reversion thus far. A Sea Demon would help.

Re: The Chevy 572 Crate Motors in the Gladiator
 

What is a sea demon?

Re: The Chevy 572 Crate Motors in the Gladiator
 

Marine carberator

Re: The Chevy 572 Crate Motors in the Gladiator
 

Please do keep us posted on the bill of materials that are necessary to correct the float bowl issue. I am converting two ZZ502 crate motors over to marine. Running the 4150HP Holley 950 carbs. Like you, I don't wish to have any carb issues while running in the slop.

Re: The Chevy 572 Crate Motors in the Gladiator
 

Can you give me a list of what you did to the motors? I just would like to know if I missed anything. Do you remember the cam specs? What exhaust did you end up with? Any dyno numbers. Tyler Cockett will have one of my soon for some dyno time. Will be interesting to see what the changes to the base motor will bring.

Re: The Chevy 572 Crate Motors in the Gladiator
 

Scoggin Dickey has a true ZZ572 EFI motor. But, the CR in print is high. Maybe it is a misprint. Only 650HP at 12.1?

Re: The Chevy 572 Crate Motors in the Gladiator
 

The valves were changed to inconel.
The valve springs were changed.
The cam was changed. 598/610 lift 230/236 duration hydraulic roller.
The head gaskets were changed.
The oil pans were changed to Eickert 12 quart.
Brodix single plane intake.
Holly 1050 Dominator carb.
Eickert thermostatically controlled oil system.


The engines made a little over 625 HP and are still running very strong for the new owner of the boat after 160 hours.


Craig

Re: The Chevy 572 Crate Motors in the Gladiator
 

Weeks later and still no parts. I finally emailed them again and he said he thought they went out. He is going to check.

Ran the boat again this past weekend. Water was nice - small chop. Motors are running perfectly. I had not run the boat in seven weeks since my San Diego outing in mid-July. Both motors fired right away and ran flawlessly. I was able to hit 90 easily at 5200rpm with the 32s. I definately need a set of 34s as there was quite a bit of throttle left. It felt like I could spin the 32s to 6000 if I had tried!

Re: The Chevy 572 Crate Motors in the Gladiator
 

Thanks Craig, Couple missing things. What did you degree the cam to? 108, 110, 112, 114 degree's
At what rpm did it make it's peak HP?
We have some similar specs in both of our ZZ502 motors. Some main differences are: I used the Edlebrock Air Gap dual plane manifold. Hard anodized, powder coated and port matched. 950 HP carb w/1" HVH spacer. KE cast exhaust.

Did you use the GM bow tie oval port heads? Where they ported? Good HP numbers from your motors. What was the peak torque?

Re: The Chevy 572 Crate Motors in the Gladiator
 

No idea on any of those questions although it was the GM heads (Edlebrock). I'll call the guys that did the motor and PM you the info. I've got the cam spec sheets. I can fax them to you if you'd like.

Craig

Re: The Chevy 572 Crate Motors in the Gladiator
 

Thanks Craig, Fax number is: 734-281-9255. Usally the cam builder/grinder recommends the degree. Some designs/grinds have a certain amount of advance "built into" the cam. You are exactly correct. Edlebrock is the contracter supplying the aluminum heads (at least the oval CNC ported) to the GM performance parts people.