Dropped an exhaust valve seat out of the head in the number 7 cylinder last time out. Had a head gasket leak earlier in the year in the same cylinder, we fixed that but I'm assuming the leaky head-gasket was the precursor to the valve seat falling out. The head cracked between the valve seats, I'm assuming this head is junk? Not to mention the valve seat pieces beating the chit out ot it...
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Dropped a valve seat, head trashed?
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11-11-2009 10:08 PM
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11-11-2009 10:41 PMI have a picture of my #7 cyl. on my 99 Powerquest, lost the valve seat and took out my piston, 4 days before our Boyne Thunder Poker Run 2008. I now have a new engine on the starboard side. When I find the pic I'll post it.
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11-12-2009 07:50 AMWhat kind of engine is it? What head? is it a 454or502 Mag?
Originally Posted by insanity
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11-12-2009 08:47 AMHP500 Carb. Square port, 088 casting.
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11-12-2009 09:00 AMFound the picture of my sick 454
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11-12-2009 10:09 AMFunny how similar the same issues look Originally Posted by Blue Oval
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11-12-2009 09:11 AMDamn near anything can be fixed, but why bother? Those heads are easy to find and are pretty cheap. If it was out of a numbers matching L-88 67 vette I would say take it to the machine shop but not a boat.
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11-12-2009 10:42 AMcast steel head, throw it out... they're cheap!
At least it didn't get the block!
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11-12-2009 12:40 PMI've been around motors all my life, the valve seat dropping out was odd. Then again most of the engines I've been around were Ford engines. Not that we have not had problems, I just have not seen this before.
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11-12-2009 04:03 PMThe 502 with the GM steel heads seems to have a reputation for dropping valve seats. I don't know why. Reversion? Was it an exhaust seat? Originally Posted by Blue Oval
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11-12-2009 05:43 PMI can put new ones in for you we have the tools
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11-13-2009 07:45 AMIf you need a piston let me know, I have a view spares that I can sell.
LE
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11-13-2009 09:19 AMHe will need to go with a oversize piston in that hole. I can see the scratches I have some .005 over pistons. Tyler 8103242720 Originally Posted by LAKE EFFECT
The Michigan Madman
url]www.crockettmarineengines.com[/url]
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11-13-2009 09:52 AMI dropped a valve seat in mine a couple years ago. Gen VI 502MPI, #8. LWP got plugged and the motor got hot, next time out dropped the seat. Mine also cracked between the seats. Now it's 509" with SRP pistons and Brodix heads.
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11-13-2009 02:46 PM"088 head cracked between the valve seats and dropped the seat" Been there done that.
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