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    StarCraft holiday 18ft 3.0 to 4.3 swap, good idea?

    Okay so you didn’t need to strengthen them from underneath with wood running to the ribs the ? That’s what I was wondering. Sure is sad to hear she’s going to the scrap yard. I would buy another one if I see it. I love these old boats. Thank you guys very much.
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    StarCraft holiday 18ft 3.0 to 4.3 swap, good idea?

    Also if I do the 4.3 should I think about bringing my fuel tank and battery up to the bow? Would it make much difference? 20gal tank 100ah battery is what I have. Thanks.
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    StarCraft holiday 18ft 3.0 to 4.3 swap, good idea?

    Okay I’ll see if I can find there build threads. I have been through waterman’s before. I have tossed around this idea for awhile. The 3.0 actually does a really good job and it plains fast with light load. But load my family and their coolies the. people gotta stand on the beach and watch lol...
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    StarCraft holiday 18ft 3.0 to 4.3 swap, good idea?

    Okay, I found an old forum where you had posted them once. They was no longer able to view though.
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    StarCraft holiday 18ft 3.0 to 4.3 swap, good idea?

    forgot to mention I run on a small long lake. It Will never be on big water if the waves are even 8” and if it’s windy i doubt it will ever leave my shop. I use it for drift fishing, running jugs and skiing. Thanks guys.
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    StarCraft holiday 18ft 3.0 to 4.3 swap, good idea?

    I have a 1969 StarCraft holiday and was wanting to do a motor swap on it this winter. Some of you may remember I bought a cracked motor that had a bad detonated piston. Well I welded the block and ran it. Been running for a few years now, but it really struggles with skiing with a boat load...
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    Mercruiser 3.0 135hp. Crank and rods

    Only thing I could think of is maybe natural gas requires higher compression? Or maybe propane.
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    Mercruiser 3.0 135hp. Crank and rods

    Okay that’s good advice and well noted thank you. Thanks guys I’ll swap the pistons back to flat tops or ask him about milling them flat.
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    Mercruiser 3.0 135hp. Crank and rods

    Okay took it new machine shop. Crank is getting ground and checked. Found the problem we believe. Two of the rods was not very round. I’m gonna be ordering my kit once I find out the bearings sizes. My question is concerning the piston. Should I keep the pistons that came with the motor. They...
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    Mercruiser 3.0 135hp. Crank and rods

    Maybe they just started idk. I couldn’t find nothing on it also. But it’s stamped
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    Mercruiser 3.0 135hp. Crank and rods

    Scat 19215. Idk what to tell ya.
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    Mercruiser 3.0 135hp. Crank and rods

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    Mercruiser 3.0 135hp. Crank and rods

    Well that’s what I though lol. He said it will just hold oil be good to go! And here I am again. You are right though I don’t think he ground my crank flat! Holding up the bearing on back side shows daylight and a Little Rocking action.
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    Mercruiser 3.0 135hp. Crank and rods

    No evidence of water. I just pulled it apart. If I put timing to zero it won’t diesel. When I shut off. The compression test is probably not accurate. I agree super high. The mains all look good. That’s a plus I guess ha.
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    Mercruiser 3.0 135hp. Crank and rods

    Any ideas why all my rod bearings look like this? Other than one is fried. To high of compression? I checked compression with my gauge and I got 220-225psi....... it does diesel for awhile when shut off with 91 and timing retarded. Cant win for loosing.
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    Mercruiser 3.0 135hp. Crank and rods

    Not sure the factory this came out of it is from Dallas I believe.
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    Mercruiser 3.0 135hp. Crank and rods

    Also maybe you may know. Why the narrow rod bearings? The rods are the same size. Just narrow bearings. Also this mother r is 10.5 to 1. I’m thinking about rebuilding it with flat top pistons. It has domed pistons right now. Maybe harder on the rod bearings also? It ran well until it brought...
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    Mercruiser 3.0 135hp. Crank and rods

    Here is crank groove.
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    Mercruiser 3.0 135hp. Crank and rods

    It was not a gm. It’s an aftermarket 3.0. It has a scat crank in it. Not sure on the manufacture.
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    Mercruiser 3.0 135hp. Crank and rods

    Well my old boat motor has two bad detonated pistons and two pistons with broke. Skirts. Still pulling skies lol. Pretty good motors in these light boats. So better idea to have the current crank turned? It’s a scat crank.
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