[Question] First time builder
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First time builder

  1. #1
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    Default First time builder

    I recently purchased a Taylor SJ 18 jet boat without motor. It had 455 with 3 point engine mount I guess the guy I bought it off of blew it up. I still have all mounts. I put in a 406 sbc that was not being used. This is my first time building boat have done numerous cars. I took motor out of my 73 nova with very low miles on it. However I installed new cam bearings rod and main bearings along with a melling high volume oil pump. All I used from car was shortblock. This is what all i've done to the engine. I bought 4 point engine mount. A brandnew set of rewarder long tube water cooled headers. I put a set of double hump 2.02, and elderbrock EPS intake, Launati voodoo cam idle to 5500 that cp performance recomended 454 intake 468 exhaust,and should make max torque at 3500 rpm, and a 650 holley carb. I refreshened the shortblock with all new bearings and brass freeze plugs. The engine is mounted, and one pump of gas fires right up. It aint been put in water yet im nervous that it aint the right parts and wont plain off. Its berkeley A cut jet. Please help me calm my nerves and tell me if this sounds like it will do what I want it to. Which is take my family out in it and run all day and have fun. Thanks Tom
    Last edited by 1974taylorSJ406; 07-11-2012 at 12:40 PM.

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    Senior Member sandeggo's Avatar
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    should work, eventually you'll wanna cut that impeller down to match your power

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    Default First build

    What cut should I have done to pump. Ls powered nice. What do you think engine rpm will be? Thanks Tom

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    first time at the lake take your time and let it idle still hooked to the trailer just floating in the water. make sure theres no leaks, check timing, check EVERYTHING. forward/reverse working, steering, etc. make sure it gets to temp. sitting in a lake and hooked up to a hose are two toooootaly different animals. adjust your gate valve to keep engine temp where it should be, etc. make sure your header valve doesnt open until 2-2500 rpms. you might wanna bring someone with you just to hold the throttle at cruising so you can look around back there and make sure things are okay, but not the whole family on a first shakedown trip. bring a spare fuel filter with you, most boats that sit around for a while get some junk in the tank that after a long trailer ride and a first outing will break free and junk up your filter and can easily ruin an outing not having a spare. make sure you assemble a little tool box to bring. plenty of rags and some simple green in case you spring a leak.

    dont forget to be safe/compliant, life jackets for everyone on board, fire extinguisher charged and properly mounted, you'll need a whistle or horn and a type IV flotation device within arms reach to throw out so the lake police are happy.

    if you're in california make sure your boat is 1000000% dry inside and out otherwise the quagga police wont even let you near the ramp. no water bottles opened, etc. they're nazis about those damn shellfish.
    Last edited by ka0tyk; 07-11-2012 at 01:10 PM.

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    Senior Member hihosilver's Avatar
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    it won't be real fast but it will get you on the water

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    Is there a certain way that you can adjust header valve? I got the tee that rewarder sent me, However i got a bassett tee that came with boat. I could blow through the rewarder tee but barely through the bassett. What should be my temp be at for my gate valve? Ive very new to this and very curious and nervous. I will do everything you said thanks. Tom

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    What do you think my speed will be?

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by 1974taylorSJ406 View Post
    Is there a certain way that you can adjust header valve? I got the tee that rewarder sent me, However i got a bassett tee that came with boat. I could blow through the rewarder tee but barely through the bassett. What should be my temp be at for my gate valve? Ive very new to this and very curious and nervous. I will do everything you said thanks. Tom
    I would set it to about 160-180* at idle....running at speed it will be much cooler. Oil temp is more important than water in a squirt boat. If your headers are getting injected too early....I would shim the spring inside with some stainless washers. If they are getting wet too late....you may need to add and use a gate valve on the dump line. And remember...no throttle= no steering at speed. If a jet ski comes in front of you....and you let off the gass and crank the wheel....you will go straight still

    Edit....you shouldnt be able to blow through the header valve....at least I cant.lol
    Last edited by H20MOFO; 07-11-2012 at 01:26 PM.
    Another Hot Boat refugee

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    If this runs good for season or 2 I will build 427 or 434 with blower on top. But that plan is for later date. I had 454 bbc but I put it in nova I took 406 shortblock out of. I just want to see my babies smiling while I cruise accross lakes here in Ohio.

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    Yeah the 1 they sent me from rewarder even looks cheap. Im going to put the bassett on it. Should I put an oil temp gauge on it?

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    Thanks for all the input. Thats why I got on here for was to ask the pros the bad boys. Im sure in years to come I will want more and more and more power. Just like my cars now. My uncle got me into jets when he would run 90 with me in his boat.

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    Hoodys and swim trunks Elkidminoltu's Avatar
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    Depending on your hull and how tight the pump is 45mph, maybe 50. Do everything that has been mentioned so far. Oil temp would be a good idea to keep an eye on, but it's not neccesary. I have a plain-jane regular ol' 350 in mine and it planes out just fine.

    Close your gate valve (turn clockwise), mark the handle and then open it (counterclock-wise) 1.5-2 turns to start out. Then have a friend drive the boat and adjust the waterflow from there. Look up some youtube videos and you'll see when the mist starts coming out the headers when they accelerate, that'll be what you want yours to do.

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    Senior Member sandeggo's Avatar
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    When I had an old smallblock in my boat I had the impeller cut down to a/b almost full B. should work for your setup depending on what condition the pump is in. Don't be in a rush to go fast, learn the boat first.

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    Senior Member 67weiman's Avatar
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    Yeah, the a cut may be a little big for where you make power but it should be perfect for you to cruise around all day and have fun. I would say you should be in the neighborhood of 50mph if pump isn't horrible.

    FWIW, I run a Sbc 377 in my boat with a stainless b.
    Last edited by 67weiman; 07-11-2012 at 02:15 PM.

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