Marlin 16fot, with 305 sbc, Need advice on set-up - Page 2
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Marlin 16fot, with 305 sbc, Need advice on set-up

  1. #15
    Senior Member VDRIVERACING's Avatar
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    Default Florida Guy

    I'm in the Jacksonville area...

    Changing those gears will make a big difference.

    Now this is going to sound bad, but I mean well and don't know how else to say it so here goes... I wouldn't throw any money or time at that engine. The 305 was a smog engine that didn't produce much power, and since you're not restricted by racing rules you have a lot of choices in small blocks; all of them with more cubic inches, more power, and more potential.

    For inexpensive small blocks I liked the 400ci that came in large sedans/wagons/trucks in the 70's. They are an overbore configuration and have no problem revving fast and have some wicked power with a circle track cam. They can still be had cheap, and would be a screamer in your 16' flattie.
    Last edited by VDRIVERACING; 11-12-2015 at 06:20 PM.

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  3. #16
    Senior Member Flatbottom Kevin's Avatar
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    Default Cool boat

    Where in Florida are you located? My brother lives in Sarasota and he is building an SE small block v-drive boat. I'm sure he will chime in here soon. I lived in St Petersburg prior to moving to Tennessee. I come down to Florida for the two inboard races. In the beginning of March there is a race in Lakeland and in May they race in Stuart. Both of those races they run the SE class that is similar to how your boat is set up. I am not trying to drag you into racing, but you might want to come watch and hang out or even swap parts and drink a few beers.
    Kevin

  4. #17
    Senior Member phughes SS-13's Avatar
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    Default

    Quote Originally Posted by VDRIVERACING View Post
    I'm in the Jacksonville area...

    Changing those gears will make a big difference.

    Now this is going to sound bad, but I mean well and don't know how else to say it so here goes... I wouldn't throw any money or time at that engine. The 305 was a smog engine that didn't produce much power, and since you're not restricted by racing rules you have a lot of choices in small blocks; all of them with more cubic inches, more power, and more potential.

    For inexpensive small blocks I liked the 400ci that came in large sedans/wagons/trucks in the 70's. They are an overbore configuration and have no problem revving fast and have some wicked power with a circle track cam. They can still be had cheap, and would be a screamer in your 16' flattie.
    Just what he said, 2X. Throwing money into a 305 is like putting lipstick on a pig, when you're done it's still a pig. A mild 350 or a 400 (or the very popular 383) would be a much better choice. If the prop is close to what you stated and with a set of 1.09's, a decent small block will make your boat quick, fast, and a ball to drive.

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  6. #18
    Senior Member phughes SS-13's Avatar
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    Quote Originally Posted by Flatbottom Kevin View Post
    Where in Florida are you located? My brother lives in Sarasota and he is building an SE small block v-drive boat. I'm sure he will chime in here soon...... and drink a few beers.
    Kevin
    That's me, so where in FL are you? Hollar if I can help.

  7. #19
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    Default

    the original poster with the boat is in Sweden guys

  8. #20
    Senior Member phughes SS-13's Avatar
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    Quote Originally Posted by mdsheppie View Post
    the original poster with the boat is in Sweden guys
    Screw that, too far to drive.

  9. #21
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    Default Yep long long way from US... :)

    Hello!
    Yes, I am in Sweden, across the pond. So racing in US SE class would be fun, but don't want to be the first to cross atlantic on a flatty (wonder how far one would get ).
    Well, regarding engine typ/size, yeep, your most certanly right, any of the larger like 350, 383 or even 400 would give about 100hp+. But as "Former Farmer" recomended, I have had quite some communication with Dave Weber E-39.
    The very kind man, have given me some very usefull info. But he also said that the roughly 260-300hp that can be squesed out, will give me something like 70mph, as that is what they had with 283's back in 70s.
    For now, that would probably make me a very happy!! . For info, 350's can be had quit cheep, but larger ones like 383 or 400 are not that common. Think that for something usefull I would need to pay about 3500-4000 usd here...
    As I bought the boat for 3200 usd, I thought I try to make it run ok (allthough not a 100mph+ screamer) for occational summer cruises on the local river/scaring people at the local Marina and some wakeboarding/watersking.
    This the small 305 would probably be more than enough to cope with. Having said that, I know for one how addictive high power/low weight can be.
    Have a 996 Ducati with 1098 engine, set-up for track, TZ350 2-stroke and some mini moto's for fun with the kids as well.
    And the Duc I would imagen to be close to the exprince of driving a "real" flatty ie supercharged bigblock, with other words getting a bit scared every time he he...
    Eventhough the set-up was not even half good at test drive, it was super cool as it was first time in a Flatty. Before the only high speed on water have been the 787 GSX seadoo I had previously.

    Everybody taking time to read/help, a big big thanks for educating me!
    Cheers!
    /Per

  10. #22
    Dead Member Hyperpasta's Avatar
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    Default

    Quote Originally Posted by Marlin73 View Post
    Hello!

    Have a 996 Ducati with 1098 engine, set-up for track, TZ350 2-stroke and some mini moto's for fun with the kids as well.
    And the Duc I would imagen to be close to the exprince of driving a "real" flatty ie supercharged bigblock, with other words getting a bit scared every time he he...
    Eventhough the set-up was not even half good at test drive, it was super cool as it was first time in a Flatty. Before the only high speed on water have been the 787 GSX seadoo I had previously.

    Everybody taking time to read/help, a big big thanks for educating me!
    Cheers!
    /Per
    Did someone mention Ducati? I have one. Per you'll be in good hands here. Sage advice and true motor heads for sure on this site. Welcome to the "DarkSide" of speed and acceleration! Shoehorn a Big Block of your choice into that hull and you'll ride your bikes to work from now on....


  11. #23
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    Default update!

    Have now gotten the v-drive out for a gear change. Spunn the input shaft to count number of rev on output to calc ratio again. As it turnes out it actually did not end up at 1,22 ratio but 1,15. Don't now how it could get that wrong when checking the last time. But know I have already bought a 1,09 set, and v-drive is out so better change it anyhow. Snow is deep so it's the right time to prepare for spring! Cheers and Happy new year all fellow V-drivers!

  12. #24
    kenny nunez
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    Default carburetor

    Just a suggestion, You probably have an automotive carburetor which is also hurting. Look at the Summit selection. They have the correct Holley marine carburetors which are jetted correctly and have the vent tubes that will prevent a fire should something causing a "flooding over" happen. I had a marine repair shop for 35 years and have had to educate a few customers on this matter. I know they are not cheap but may save your boat from having a "MELT DOWN". Good luck

  13. #25
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    Quote Originally Posted by kenny nunez View Post
    Just a suggestion, You probably have an automotive carburetor which is also hurting. Look at the Summit selection. They have the correct Holley marine carburetors which are jetted correctly and have the vent tubes that will prevent a fire should something causing a "flooding over" happen. I had a marine repair shop for 35 years and have had to educate a few customers on this matter. I know they are not cheap but may save your boat from having a "MELT DOWN". Good luck
    Apart from the important setting the little vessel on fire,you don't think that the edelbrock will work? But your right,as far as I know, the carb is not only a car carb but also setup for milage not perfomance...
    Thanks for the tip!

  14. #26
    marlinjoe
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    Default If you can check out my 73' Marlin, think we may have the same boat

    Quote Originally Posted by Marlin73 View Post
    I have finaly gotten the flatty in the water, yey!, but speed was not what was hoped for. Thought I test this forum for help and maybe there is also sombody that could tell me something about it's history. I can see that I have 2012 Florida registration tax paid...
    Current set-up is:
    305 sbc, std heads 1,84 inlet, 1,5 exhaust, Holly Street eliminator inlet, edelbrock 600cfm carb, powerglide auto box with dummy converter. 10 deg casale with 1,22 gears. 2 bladed Propeller is abit hard to see markings, but should be about 11" with pitch about 14-15".
    Anybody dare to guess what in o speed one could get IF ratio on casale is revised?
    Which ratio do you recomend?
    Thanks in advance!
    /Per in Sweden
    I have an album of my Marin Super Sport in performance boats an an ad in boatrader.com.It matters with HP and weight, so the small block hypo is the way to go. If it's a v-drive the max overdrive is 12 degrees. The prop i bought from scott Baker is a RH11 1/2"X 16 pitch with quite a lot of rake which gives you the stability at higher speeds. These boats were made to go easily over 100 mph. I restored the hull, sanding off old gel coat and and re-coat with Imron epoxy and centari paint and 8 clear coats. Will stay new forever and parts will last another lifetime. I got old and am now selling sadly but it's time. It's going for $18.5K usd, priced to selll if you know anyone. Otherwise i WILL always try to help another flatty guy. My email is: [email protected] hope i can be some help. George

  15. #27
    marlinjoe
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    Default About the carb.

    Quote Originally Posted by Marlin73 View Post
    Apart from the important setting the little vessel on fire,you don't think that the edelbrock will work? But your right,as far as I know, the carb is not only a car carb but also setup for milage not perfomance...
    Thanks for the tip!
    I run a Holley 650 cfm Annialator that we checked online with Holley on the jet size that went from about 26/28 to 46/48. You may also want to add jet extenders on the rear float boat bowl. That keeps you in the fuel when accelerating, you never want to lean when it's climbing. I get 20mpg at cruise (60) because there is no drag, engine hardly has to work. The whole boat weighs 1650 lbs. so it is very effiicient. Best of luck

  16. #28
    marlinjoe
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    Default Think you should look into a chevy 383 stroker engine like mine maybe

    [QUOTE=malinjoe;4084849]I have an album of my Marin Super Sport in performance boats an an ad in boatrader.com.It matters with HP and weigt

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