[Pics] 20.5 advantage exhaust swap
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20.5 advantage exhaust swap

  1. #1
    Senior Member fupa's Avatar
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    Red face 20.5 advantage exhaust swap

    I finally put my new thru-transom headers on my boat last weekend! Removed the log manifolds and risers that were a pee-pee 2 3/8" outlet to a full bore 4" system!! What a differance in performance, picked up 300 rpm with no other changes! I will need to fatten her up a lil now tho. couldnt afford the jacketed style, but found a deal on these here on PB. Now it turns my "A" 5600. Super Stoked!! The only bummer is that i need to widen the hatch 3+ inches. See yall at the water!
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  3. #2
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    If those are not jacketed I would not run them under a hatch!
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  4. #3
    Senior Member Mojave85's Avatar
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    Quote Originally Posted by Oldelmn8tr View Post
    If those are not jacketed I would not run them under a hatch!
    X2 - way to much heat
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  6. #4
    Senior Member fourtznme's Avatar
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    Quote Originally Posted by Oldelmn8tr View Post
    If those are not jacketed I would not run them under a hatch!
    They are illegal and very dangerous.
    Murrieta / Needles Marina Park
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  7. #5
    Senior Member fupa's Avatar
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    whats illegal about them? seen lots of them arround....
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  8. #6
    Senior Member fupa's Avatar
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    Quote Originally Posted by Mojave85 View Post
    X2 - way to much heat
    yea i have heard some say that it will be too hot, but i dont see a problem in a properly built and vented cover. I always run the blower before i fire it so not worried about a boom. hell most of the time i run it with it on too! pulls extra heat out
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    Reminds me of the song Burning down the house.!
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  10. #8
    Senior Member fourtznme's Avatar
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    Quote Originally Posted by fupa View Post
    whats illegal about them? seen lots of them arround....
    I remember reading about this awhile back, but I can’t find it now. Still very dangerous, so good luck.
    Murrieta / Needles Marina Park
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  11. #9
    Senior Member Mojave85's Avatar
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    Quote Originally Posted by fupa View Post
    yea i have heard some say that it will be too hot, but i dont see a problem in a properly built and vented cover. I always run the blower before i fire it so not worried about a boom. hell most of the time i run it with it on too! pulls extra heat out
    I hope you have good insurance and don't value the safety of your family and friends. I think it is a bad move but good luck.
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  12. #10
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    Default 20.5 advantage exhaust swap

    Would probably change your fuel line & filter! It would also appear that you have ran the headers hot already, looking at the color. I have ran the same headers on a covered NOS engine for over 10 years with no issues. However, you should notch/file the Bassett T-valve, and also run a control valve at the drivers seat so you can have some water at an idle, then open the valve when on the throttle. May consider stainless plates on the inside of your hatch above the headers. Yes not legal, but most hot rod boats are not. If you set it up correctly, and operate it safetly, you will be fine. Just be aware and careful controling the water flow/temp of the headers.
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