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Old 11-13-2017, 12:23 AM   #1
Join Date: Jul 2011
Posts: 340
Default Mercruiser 357 Mag Bravo 4V

These have 6 drain plugs in case anyone is wondering.
Two on the block itself, low on each side.
Two under each exhaust manifold.
One on the starboard side, it drains the large host going to the theromstat housing.
And one under the port side, where the water hose turns into a metal pipe, drains that line.
Unlike the Mercruiser 350/5.7L which usually have only 4.

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Old 11-13-2017, 02:11 AM   #2
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Join Date: Feb 2012
Location: Essex, Maryland
Posts: 7,768

Thanks for sharing. Is there one on the power steering cooler?
1997 2400 SCR
5.7 Vortec / Bravo 2
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