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Thread: Mercury 300 PROMAX Heads
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11-01-2016, 07:45 PM #1
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Mercury 300 PROMAX Heads
3.0l Promax Heads off of 1999 300 Promax. #4 has a cracked in the combustion chamber I don't know if it can be fixed or not. It had sucked in water because of a bad oring gasket. The other head is in great shape. No other damage was done to the motor. I just bought new heads and it runs great still. $100 plus shipping
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11-01-2016, 10:18 PM #2
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That's very interesting looking. The cups don't look like the standard mercury shape. After looking more I think I see someone has machined the factory cup out and put removable chambers in them... if so that's an easy fix by just swapping out one of the cups
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11-02-2016, 01:17 PM #3
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The motor has had some work done to it by Simon Motorsports so you are probably right. Still up for grabs
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11-09-2016, 04:58 AM #4
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Hi there, are the heads still For Sale?
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11-12-2016, 09:49 AM #5
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if the one good is still around I would be interested....
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03-04-2018, 06:04 PM #6
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Still available
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03-08-2018, 04:45 PM #7
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Would like to talk to you about them. Call me or text at 903-733-5286 when you get a chance.
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08-21-2018, 07:01 AM #8
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PM me your contact info if the heads are still for sale. Do you know what CC the chamber size is? Thanks, Paul
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08-21-2018, 02:24 PM #9
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Sorry for not posting this earlier but these have sold.
Originally Posted by Tinbanger1979
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