Any reason I shouldn't put this here? Dump line question
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Any reason I shouldn't put this here? Dump line question

  1. #1
    Senior Member H20MOFO's Avatar
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    Default Any reason I shouldn't put this here? Dump line question

    I am relocating the dump on my transom to the very upper far drivers corner...there was a tank vent that I am not using. Any reason I cant come out of the block/intake here on the back of the motor? Seems like it would help eliminate gas pockets? I dunno... Just seems cleaner than running it off the front...under the motor....and then going over to the side.

    Another Hot Boat refugee

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    Senior Member moneysucker's Avatar
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    No reason. I have 1 of my 3 dump lines coming from there. I use 3 outlet lines to 1 inlet line to reduce block pressure.
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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by moneysucker View Post
    No reason. I have 1 of my 3 dump lines coming from there. I use 3 outlet lines to 1 inlet line to reduce block pressure.
    Thanks Cy....I wasnt sure if that would leave a part of the block "un-circulated" so to speak.
    Another Hot Boat refugee

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    Senior Member Oldsquirt's Avatar
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    You would be better off teeing both rear water ports together and running a dump from that, or running two dumps, one from each side of the manifold. By only using one side, even if it is in conjunction with a dump from the front water crossover in the manifold, you will end up with uneven flow through each side of the block. If you plan on using that single port as the ONLY dump line, you would be creating some cooling issues.
    Last edited by Oldsquirt; 03-12-2011 at 10:05 AM.

  7. #5
    Senior Member moneysucker's Avatar
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    On mine I have 1 -8 inlet teed to 2 -8 in at the blower manifold 2 out at the water pump and 1 out at the rear of the manifold.
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    Senior Member bwurst1's Avatar
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    If this is your only return I would reconsider it. You wont get proper cooling to the front of the heads. A BBC cools from front-to-back of the block, up through the rear of the heads then forward to return out through the intake manifold. If your return is on the rear of the manifold your heads will run hot up front due to only having blow by to cool. Even worse if your return is only on one side....Hope this helps
    Last edited by bwurst1; 03-13-2011 at 10:29 AM.

  9. #7
    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by bwurst1 View Post
    If this is your only return I would reconsider it. You wont get proper cooling to the front of the heads. A BBC cools from front-to-back of the block, up through the rear of the heads then forward to return out through the intake manifold. If your return is on the rear of the manifold your heads will run hot up front due to only having blow by to cool. Even worse if your return is only on one side....Hope this helps
    I had changed my mind to 2 out the back after olsquirts post....I just finished making 2 new braided stainless lines.lol Part of the problem is I do not understand the flow once inside the block. If it goes in the front(water pump holes) and out the rear of the bolck/manifold....isn't that cooling ft to rear....or does it need to make its way back to the thermostat housing for a complete loop through the block?
    Another Hot Boat refugee

  10. #8
    21 Daytona Outlaw's Avatar
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    it needs to flow to the front of the heads unless you modified the head gaskets IMO
    GM spent lots of $$ designing it this way
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  11. #9
    Senior Member bwurst1's Avatar
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    Quote Originally Posted by H20MOFO View Post
    I had changed my mind to 2 out the back after olsquirts post....I just finished making 2 new braided stainless lines.lol Part of the problem is I do not understand the flow once inside the block. If it goes in the front(water pump holes) and out the rear of the bolck/manifold....isn't that cooling ft to rear....or does it need to make its way back to the thermostat housing for a complete loop through the block?
    The water enters the block from the water pump holes, travels through the block (not the heads) front to back. Then up into the heads from the rear. Then the water makes its way through the heads rear to front exiting out the Thermostat. To maximize cooling, run a equalization line between the rear holes on your intake manifold and return from the front. Hope this helps.

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    Senior Member bwurst1's Avatar
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    Taake a look at this picture. Hope it helps
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  13. #11
    Senior Member Oldsquirt's Avatar
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    Quote Originally Posted by bwurst1 View Post
    The water enters the block from the water pump holes, travels through the block (not the heads) front to back. Then up into the heads from the rear. Then the water makes its way through the heads rear to front exiting out the Thermostat. To maximize cooling, run a equalization line between the rear holes on your intake manifold and return from the front. Hope this helps.
    Not exactly. Take a look at the pic you posted. There are six holes along the block that correspond to holes in the head and head gaskets(holes in head gasket that match the upper row of coolant ports are usually much smaller than the holes in block) . The coolant is passing through these ports into the heads as well. Only some of the water goes the full distance of front-back-front. The rest takes each of the other "shortcuts". This is necessary to provide even cooling. Imagine how hot the front of cylinder head would get if this wasn't done.

  14. #12
    Senior Member H20MOFO's Avatar
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    Thanks for drawing/spelling it out for me guys...I guess I will go to plan c. lol
    Another Hot Boat refugee

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