Time to buy remanu engine--help

B

backwater dawg

Petty Officer 2nd Class
Joined
Apr 12, 2007
Messages
183
OK---now it's time to buy a remanu long block--my 1988 Merc 5.7--260 hp blew last summer and now it's time to start working on it---I pulled the bad one out last fall-- put the boat away --so here we go --i need some advise on your favorite rebuilders-----any help would be great--thanks Steve
 
chiefalen

chiefalen

Captain
Joined
May 18, 2008
Messages
3,598
Re: Time to buy remanu engine--help

Michigan motors. Friends bought from them. One had to readjust the rockers but thats common and should be done anyway when your first start up the motor.
 
Fishermark

Fishermark

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Joined
Oct 19, 2003
Messages
5,617
Re: Time to buy remanu engine--help

If you have an engine with all the marine accessories already and simply need a long block, I would strongly suggest buying a brand new truck crate engine from GM. The truck cam is nearly identical to a marine grind and you can simply bolt your marine externals on. You can check to make sure the freeze plugs are brass - but those are easy to change. Here's what I am talking about:



80912568758.jpg



The engine pictured is sold at Jeggs for $1769.99. Here's the description and specs:

This four-bolt main block has a one-piece nodular iron crankshaft and powdered metal connecting rods with dished hypereutectic pistons for a 9.4:1 compression ratio. It features a flat tappet hydraulic camshaft and swirl port intake design. The exhaust flange is 7-bolt, and the valve covers are centerbolt. 200 horsepower rating at 4000 RPM (300 ft/lbs TQ) and includes an 8" balancer, 4-quart oil pan, timing cover, and valve covers.

Specifications
Block: Cast iron, 4-bolt main, 1-piece rear main seal
Connecting Rods: Powdered Metal Connecting Rods
Pistons: Dished Hypereutectic
Compression Ratio: 9.4:1
Oil Pump: High-Volume Oil Pump
Timing Chain: Morse link-type
Camshaft: Flat Tappet Hydraulic (Lift .382" Int/.402" Exh; Duration @ .050" 165.9? Int/174.8? Exh; Lobe Separation Angle 111.9?)
Cylinder Heads: 65.3cc chambers, 1.94"/1.50" valves, swirl port intake design (heads are not performance-oriented; intended for good bottom end torque and fuel economy; intake runner is restrictive because it has a ramp cast into the bottom of the bowl to promote high swirl)
 
Howard Sterndrive

Howard Sterndrive

Rear Admiral
Joined
Nov 5, 2008
Messages
4,603
Re: Time to buy remanu engine--help

I'm with Fishermark... I much prefer factory assembled new units... rebuilds are hit and miss due to the human factor at the quality control level, and a warranty does you no good if you are paddling... fine when a tow truck can latch onto your car...

And the GM crate engines all clearly state no warranty if used in marine applications. But it's still the way I would go.

Check your local chevy dealer... the one near me has one sitting in the parts dept for $1500 cash and carry
 
chiefalen

chiefalen

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Joined
May 18, 2008
Messages
3,598
Re: Time to buy remanu engine--help

Excuse me Fishermark, may i ask a question about the factory motor straight from gm.

Did i see a high volume oil pump in the specs??
 
J

jy118lfd

Chief Petty Officer
Joined
Jun 18, 2004
Messages
497
Re: Time to buy remanu engine--help

This is the way I am going when I have to repower, Brand new Roller cam vortec motor. The very best that ever came stock from GM for marine. These are GM marine long blocks. You will need a vortec manifold or an older model year motor but I would not put anything in it other than a vortec head motor. I am lucky and have a vortec motor but it is a 5.0. I can't wait to feel how good it runs with the torque of a 350 in my boat. I also would not put a flat tappet cam in a boat anymore. The rollers are just so much better.

http://cgi.ebay.com/ebaymotors/5-7-...5974997QQptZBoatQ5fPartsQ5fAccessoriesQ5fGear
 
chiefalen

chiefalen

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Messages
3,598
Re: Time to buy remanu engine--help

Buy a motor setup as marine will save you all kinds of hassle.

If your rebuilding yourself than you can build to marine specs.

A high volume oil pump is not what you want in a marine engine.

Never use a High Volume oil pump in a marine engine with a stock pan...they can suck up oil out of the pan faster than it can recover.

Bye the way there is another option not explored here.

A good used motor checked out and fresh water used. And all dressed out and ready to drop in.

Good luck ! Want a recommendation of a guy i know won't cheat you just ask.
 
B

bolo78910

Chief Petty Officer
Joined
Jun 25, 2006
Messages
503
Re: Time to buy remanu engine--help

just have to be careful who you perchase rebuild engine from , just my two cent, sometimes it better you just get the new long block.
 
P

piratedude

Petty Officer 2nd Class
Joined
Nov 18, 2004
Messages
112
Re: Time to buy remanu engine--help

Do Not Use Michigan Motors!!!! Lousy Service - I Got A Motor From Them And Was Damaged When Unpacked. They Refused To Send The Repair Parts! Also Sent Wrong Wiring W/ Motor. Refused To Send Correct One. Just Rebuild What U Have .
 
chiefalen

chiefalen

Captain
Joined
May 18, 2008
Messages
3,598
Re: Time to buy remanu engine--help

By the way there is a 4 quart pan on the motor totally wrong, for a high volume oil pump, for marine use.

Also why a V8 that only makes 200 hp, when 4.3 V6 makes more ??

So whats the fix to the high volume oil pump if you wish to keep it ?

Any one know ?

I do.

Look below.























Install a low pressure bypass spring (they normally come with the high pressure spring installed from the factory)

But then it's not stock from the factory.

This motor is fine for a automobile, on a track " maybe " not on a boat.
 
Big Boat Bay Buster

Big Boat Bay Buster

Petty Officer 2nd Class
Joined
Jul 1, 2007
Messages
118
Re: Time to buy remanu engine--help

I rebuilt my 260 myself mainly because I have the tools and know how. Its something I enjoy and I wanted to teach my son the inner workings of an engine. BUT, after I added up the cost of the parts and machine work, it was the same as some of these mail order engines. I knew this going into the project, but I'm very happy with the outcome!:)

Its my understanding that high pressure pumps and high volume pumps are TWO DIFFERENT types of pumps!
High volume has TALLER gears and will sit deeper in the oil pan, If you use the stock pan with the original pick-up screen you will have clearance problems.High pressure is just a stronger relief spring. This pump will add unnecessary drag and is not needed for our motors. Chevy oiling systems have a great reputation, no need to change things. During a rebuild, replaced the pump with a stock one (real cheap!)and reuse the pick up since its matched to the mercruiser oil pan. What's important here is that you change the OIL PUMP SHAFT! , especially the nylon connector--Basic Chevy knowledge!
Chris
 
chiefalen

chiefalen

Captain
Joined
May 18, 2008
Messages
3,598
Re: Time to buy remanu engine--help

Nice Cris, to teach your boy what you know. What sorta heads you throw on that 260.

There may be a project going on in the Chiefs Tepee this summer, with a 260.

And my son will be helping me.

More on this latter, if i can get the wompum together for the boat.

I have been waiting many, many moons for something special, might have found it.
 
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