New to the site and boating, build advice
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New to the site and boating, build advice

  1. #1
    Member Jmicus's Avatar
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    Default New to the site and boating, build advice

    Im new to this site and looking for some input. I have 240 outlaw with a gm 502. The motor has about 40 hours on it now and either popped a intake manifold gasket or head gasket because there was water in the oil. Leaning toward the intake manifold gasket because compression was the same plus or minus 5 psi across all cylinders.

    Figured it was a perfect time to do some mods to the motor. The motor already has cmi headers. The drive is also recently rebuild with 40 hours on it.

    I bought a b&m 174 blower setup with a holley 850 4150 double pumper from the carb shop, the setup is used with low hours and set up for a 468 so some re-jetting will be in order. I also plan on running meth and bought the snow meth stage one setup with the boost switch. Head studs and felpro mls gaskets are ordered as well as gauges.

    I know the blower is a little small for the application but i figure ill start small and work my way up. Plus the money was right. Am i missing anything? Ive read that the outlaws have a one way valve inbetween the tank and the valve but i believe its been removed. Im away at work right now and just trying to get my ducks in a row for when i get back.

    thank you for your input.

    Also, my fuel pump and water pump are connected on the front of the motor. The guy covered it with so much engine enamel i cant find any information or serial number to find info about the flow rate of the fuel pump. Any information on those would be great as well as vague as my description is on it.



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    gn7
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    Welcome to the mad house.
    It could be the intake gaskets, but it you are changing out the head gaskets it doesn't matter.

    Heads studs are fine, but unless you plan on some pretty serious boost, not really necessary. Head bolts will hold any boost pressure you will see with pump gas, even with the meth injection.
    If the fuel pump is the one that runs off the water pump and looks like this, you may want to get a fuel pressure gauge and monitor the fuel pressure. These can be marginal with a blower. It will probably keep up with a single 850 on a 174 blower, but you may what to watch the pressure.





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    yea that looks like the pump! thanks for the info. Are there any issues with taking the pump off and just going with an electric fuel pump. Do they make block off places for that port? Im looking online now but i cant seem to find anything.

    again thank you for your help

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    Member Jmicus's Avatar
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    got it i think!

    Chrome Steel Big Block Chevy Fuel Pump Block Off Plate - CP Performance

    also if i end up sticking with a mechanical pump, can i put any BBC mechanical pump on the mercruser water pump or is it only compatible with a merc fuel pump
    Last edited by Jmicus; 08-04-2013 at 01:04 AM.

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    Quote Originally Posted by gn7 View Post
    Yeah I am pretty sure the BBC blank off fits.

    so could i used a larger BBC mech pump on that merc water pump?

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    gn7
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    Quote Originally Posted by Jmicus View Post
    so could i used a larger BBC mech pump on that merc water pump?
    No, the arm is wrong



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    Bostick Racing Engines six-oh-nine's Avatar
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    Quote Originally Posted by gn7 View Post
    No, the arm is wrong
    Is it a small block pump? Seems kinda crazy to not use an existing pump if one is going through the trouble of making a water pump/fuel pump combo deal.
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    I can't find a flow rate for it. It was on my 502 when I bought it and I can't find a serial number either. I just don't want to slap the build together and find out I'm running lean because the pump can't keep up when I'm running hard.

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    gn7
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    Quote Originally Posted by six-oh-nine View Post
    Is it a small block pump? Seems kinda crazy to not use an existing pump if one is going through the trouble of making a water pump/fuel pump combo deal.
    I agree. But its only an arm change for the company making the pump. Could be an arm form one model and the body from another.

    Hard to believe the KE would go thru all the trouble of making a lower body for 200.00 if you could just replace the pump with an off the shelf Holley or Clay Smith pump.



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    Quote Originally Posted by gn7 View Post
    Hard to believe the KE would go thru all the trouble of making a lower body for 200.00 if you could just replace the pump with an off the shelf Holley or Clay Smith pump.

    Merc making a pump that is oddball when they are already going through the trouble of making a special oddball deal to mount/drive a pump... seems a bit dumb.

    KE making a lower body to mount to a pump that costs 200 bucks... that, for some odd reason, doesn't seem crazy, it just kinda goes with the whole "big boat" gig... expensive "special" parts when something off the shelf will do. I've seen dudes that own these 40' flying/floating building sized monsters spend stupid amounts of loot on "specialty" crap when a shelf performance part will do... just because it was, A) Expensive and B)Super bitchen BILLET ALUMINUM.
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    Quote Originally Posted by six-oh-nine View Post
    Merc making a pump that is oddball when they are already going through the trouble of making a special oddball deal to mount/drive a pump... seems a bit dumb.

    KE making a lower body to mount to a pump that costs 200 bucks... that, for some odd reason, doesn't seem crazy, it just kinda goes with the whole "big boat" gig... expensive "special" parts when something off the shelf will do. I've seen dudes that own these 40' flying/floating building sized monsters spend stupid amounts of loot on "specialty" crap when a shelf performance part will do... just because it was, A) Expensive and B)Super bitchen BILLET ALUMINUM.
    The big boat boyz do love their BLING. I am sure KE sells a bunch of them to guys with stock motors. The whole water/fuel pump combo thing is only used on Gen engines that don't have a mech pump mount.



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    So for the price it would be better to just get a blank off plate and run an electric fuel pump. PPrice wise it doesn't seem like it would be that much more. What flow rate should I be looking for? Around 130 gph?

    its a weird setup I've never seen anything like it. But I'm new to the boat game

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