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  1. #21
    Join Date
    Jun 2007
    The alt and starter dist, etc. have spark protection and should be coast guard approved.

  2. #22
    Join Date
    Feb 2001
    When GM was making the old style small block 350 and 305 for passenger cars and trucks, how many do you think they made a year. As a percentage, how many went into boats? I think this is where you will find the answer to the great debate.

  3. #23
    Join Date
    Oct 2004
    Newbury Park, CA
    Quote Originally Posted by fandango View Post
    Can anyone (specifically anyone who works/worked for either company or has FIRST hand knowledge- not I know someone who knows someone) answer the question of what is the difference between the short block that GM performance sells -ZZ502 - and the shortblock that come with the "marine engines" from 1800runsnew and the likes. We are talking about only the shortblocks (not heads, cams, etc). You can buy a GM ZZ502 shortblock for approx $ 4400 I think and the 1800runsnew total engine is about $ 5400. Is someone taking apart these shortblocks, changing/checking clearances, balancing and reassembly, and then charge only an extra $1000 for the entire motor?? Point is I have heard that the 415 horse 502 comes from a plain GM performance shortblock (forged piston, steel crank, 7/16 rods etc.) and the 500 hp was disassembled and changed/checked, balanced and reassembed. Sorry for the long post.
    I spoke to a high volume marine engine manufacturer recently, and one of their engines is based off the ZZ502. They just get a GM crate engine, replace the valves with Inconel, put it back together, and dress it. That's it. He's says they have had no problems.

    This is not to take away from what people have mentioned here. The higher the performance, and load, the more changes you should be making, including changing clearances, etc.


  4. #24
    Registered Liquid Liability's Avatar
    My Boats:
    Baja H2X, 2008 Fountoon Quad-Step-Tri-Toon Stripper Pole Edition
    Join Date
    Sep 2004
    Looking for my lost EBITDA!!
    Quote Originally Posted by Bigyellowcat View Post
    paint it blue and put a mercury sticker on it and you will have magically turned it into a marine engine.

  5. #25
    Registered ZBODaytona's Avatar
    My Boats:
    2001, Eliminator, Daytona 28
    Join Date
    Oct 2004
    Leesburg, FL
    Didn't eliminator take the 572 motor from gm, change the cam and put it in a boat. Thought i read in magazine that they did and it worked good. Of course i don't think they said how long it worked good.

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