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Topic Review (Newest First)

  • 05-03-2008, 12:04 AM
    ol guy
    Quote Originally Posted by JAY4SPEED View Post
    GM crate engines are not warrantied for marine use unless the specific model crate engine is designated for marine use by GM. So, you could drop 12K in a 572 and your on your own as far as warranty goes.

    Jay
    F.Y.I. For years G.M.crate motors have been used in boats by people you may have heard of,Hardin,OMC,Mer-Cruiser and the list goes on and on. Also don't forget the Fords that went in alot of boats to. As far as warranty goes! Hi perf use voids all warranty by all, except the marine installer. M
  • 05-01-2008, 07:18 PM
    hotfish
    A buddy put a 572 in his boat and had nothing but problems. They even sent it back to GM because of a problem with the lifters. GM said there was nothing wrong. Ended up messing up a piston and head. Maybe he just got a bad apple I dont know but I guess it does happen
  • 05-01-2008, 06:57 PM
    downsouth
    Has anybody used the 528 crate hemi in a v drive or jet application? And if so, what mods were necessary, if any?
  • 04-30-2008, 11:51 PM
    Sangerx3

    28 Season on a GM Crate Motor

    In 1979 I purchased a GM LS6 from the local Chevy Dealer, installed a jet boat cam, tunnel ram, and twin 750's. Over the last 28 years I've replaced the cam once and the valve springs three times. Two years ago I installed a V-Drive oil pan and a cam driven water pump, turn it around backwards and installed it in a V-Drive. In my jet it turned 6000 rpm giving me about 80 mph, in the hydro it turned 6700 rpm giving me 112 mph. The compression and leak down numbers are still not bad. This season I've had a new Dart 540 built for the jet and intend to rebuild the LS6 as a blower motor. I've more that got my money out this Crate Motor, wholesale in 1979 for $1300 plus shipping.
  • 04-16-2008, 07:43 PM
    DuaneHTP
    Yes.
  • 04-16-2008, 03:01 PM
    Rocket-J
    CStaub recommends the Melling 10770 oil pump. About $30 dollars more but worth it.
    I don't know about the 572 motor, but a lot of Chevy motors are externally balanced, such as the 502. Keep that in mind when changing parts on them.
    I nearly bought a 572 but did not want to have to use Race Fuel all the time. It has a 12:1 compression ratio.
    Duane. Are you using the stock heads and pistons in your 572's ?
  • 04-15-2008, 08:17 PM
    Boat 405
    Quote Originally Posted by Rocket-J View Post
    There have been some problems with the oil pump drive shafts. You might as will update the oil pump while you are there. Cheap insurance. Al
    Great point, I have replaced both shafts with ARP shafts and Mellings 77HV pumps with canton 9 quart oil pans. Actually the race motor has a custom Stef Pan.
    Both of them work great.
  • 04-14-2008, 10:33 PM
    Rocket-J

    GMPP motors

    There have been some problems with the oil pump drive shafts. You might as will update the oil pump while you are there. Cheap insurance. Al
  • 04-11-2008, 10:17 PM
    SmokinLowriderSS
    Quote Originally Posted by DuaneHTP View Post
    We've used over 20 of the 572 motors. Of all of them used, we've only had trouble with one. He has blown it up three times. But no matter who builds what for him, he will blow it up.
    Hmmmmmmmm..............


    Pretty funny actually, since that isn't me.
  • 04-11-2008, 07:41 PM
    DuaneHTP
    We've used over 20 of the 572 motors. Of all of them used, we've only had trouble with one. He has blown it up three times. But no matter who builds what for him, he will blow it up. The clearances are pretty tight for a marine application, but with a long easy break in, they seem to survive just fine. We've ran about half of them on the dyno. Only two of the ones we ran dynoed under their rated HP. One major problem that we've ran in to with them is the Demon carburetors and the intake manifolds that come on them. We use an innoivators system to check the fuel mixtures. When hooked up to the collectors side to side of engine, the mixture reads just fine. But when we hook up the innovators 8 channel system, one to each cylinder, we find 4 very rich cylinders and 4 cylinders lean enough to detonate. All you have to do is put a Super Sucker under that Demon and it will straighten it right up. Then send the manifold to Rehor-Morrison, they will rework the dividers and you pick up another 11 to 19 hp and the mixtures get near perfect. I just pulled some records and one of the motors we dynoed went like this. 720Hp - 572 crate motor out of the box dynoed 724HP. Put a super sucker under the carb and got 738HP with a lot better A/F ratio. Put a Holley out of the box on it and only got 2 more HP, but the mixtures were better yet. Sent the manifold in and run it again and it went to 758Hp. We put this motor in a jet boat and he won the championship in his class that year. The next year he put a N2O set up on it that would go to 500 hp and he is still running it. I don't think he ever sprayed over 350hp though. Oh, BTW we put a Basset 10 quart oil pan on every one of them. This has been my experience with them. Now, on the 502 crate engine, I've never got one that would dyno at or above 502 HP.
  • 04-11-2008, 06:32 PM
    SmokinLowriderSS
    And you will not likely get any corrosion in the water passages unless you start parking it for weeks at a time in a slip in the water continuously.

    Put it on the trailer, the water drains out of the heads and upper block, the engine heat dries them, moisture required for galvanic (dissimilar metals) corrosion is gone.
  • 04-11-2008, 05:35 PM
    sleekcrafter
    Quote Originally Posted by widowmaker View Post


    I have two crate motors. a 2000 Gen VI 454 HO in my 21' Eliminator Daycruiser with about 100hrs on it. Runs flawlessly

    2008 Gen VI 502/502 short block for my motor in my race boat. With the top end combo and AFR heads and a dart tunnel ram. Pushes my 19 Daytona to 113mph at 9.25 at Lake Ming Last weekend.

    These two motors are the best ones I've ever had.

    I've ran the ZZ502 aluminum heads in marine use for 8 seasons. no problems, they were gone thru when new, guides reamed, and inconel exhaust valves. Motor is apart for freshen up, heads still look great, no corrosion in the water passages.
  • 04-11-2008, 05:24 PM
    Boat 405
    Quote Originally Posted by sangercat View Post
    Was wondering if someone with real know-how could explain to me why a chevy big block crate motor will not work in a marine application. The 572 720hp motor looks killer but engine builders in my area say it wont work and will blow up. Same with evey other crate motor, 502, 454, ect. Any info would help.

    Thansks


    I have two crate motors. a 2000 Gen VI 454 HO in my 21' Eliminator Daycruiser with about 100hrs on it. Runs flawlessly

    2008 Gen VI 502/502 short block for my motor in my race boat. With the top end combo and AFR heads and a dart tunnel ram. Pushes my 19 Daytona to 113mph at 9.25 at Lake Ming Last weekend.

    These two motors are the best ones I've ever had.
  • 04-03-2008, 03:49 PM
    SmokinLowriderSS
    Quote Originally Posted by Outlaw View Post
    just what part # do they put on the 572? How cheap??? I need one for my
    68 El Camino
    Ask Duane http://hi-techperformance.com/1-417-856-8616
This thread has more than 14 replies. Click here to review the whole thread.

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