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525,600,700 header gaskets

Old 01-31-2017, 06:54 AM
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Originally Posted by Young Performance
We have some MLS stainless steel gaskets made for the 525, 600,700. They are lifetime gaskets. You can not hurt them. If the header loosens, the stock gasket will push out. You then have to take the header off and remove the gasket and replace it. Mercury gets almost $60 per set. Our gaskets are a little more, but they will last forever. If the header comes loose and starts to leak exhaust gases, just tighten it back it. You WILL NOT blow the gasket out. They are $85 per set and worth every penny.
Eddie
Damn, I wish I knew about this. I just bought three sets of gaskets. Next replacement cycle, I'll be calling you.

Plus, I bet it's pretty nice not to have to scrape the old gasket material off the heads every time too..
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Old 01-31-2017, 09:40 AM
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That is the biggest pain of all of it. After they have been run for a while, the Merc gaskets get very hard and stick to the head with vengeance. You have to completely remove the header to be able to scrape (beat) the gasket off. No more of that with these gaskets.
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Old 01-31-2017, 10:06 AM
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Originally Posted by Young Performance
We have some MLS stainless steel gaskets made for the 525, 600,700. They are lifetime gaskets. You can not hurt them. If the header loosens, the stock gasket will push out. You then have to take the header off and remove the gasket and replace it. Mercury gets almost $60 per set. Our gaskets are a little more, but they will last forever. If the header comes loose and starts to leak exhaust gases, just tighten it back it. You WILL NOT blow the gasket out. They are $85 per set and worth every penny.
Eddie
Sounds like the hot ticket, I'll ring you up as I get closer

Thanks
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Old 01-31-2017, 10:08 AM
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I can get the MLS gaskets as well and yes that's the way to go 4 sure. I TOTALLY AGREE with Mr. Young. My problem is I do not see that many 525 or 600's around in my area anymore like we use to. Currently I do not have any in stock but will soon as boating season seems to be starting early this year. Weather warmer and lake levels up / normal here.
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Old 01-31-2017, 10:22 AM
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I'm about to reinstall my 525 headers after pressure testing them and will be using new Mercury gaskets. Should I install them raw as Mercury appeared to do or should I use a copper sealant?
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Old 01-31-2017, 11:10 AM
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Here are pic of them
Attached Thumbnails 525,600,700 header gaskets-20170131_110701.jpg  
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Old 01-31-2017, 04:32 PM
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Originally Posted by Young Performance
Here are pic of them
I sent you a pm but your box is full.
Tks
John
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Old 01-31-2017, 06:23 PM
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502 gaskets can be modified to work.
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Old 01-31-2017, 11:20 PM
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Originally Posted by getrdunn
I sent you a pm but your box is full.
Tks
John
Sorry. I emptied it.
Eddie
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