Has anyones valve seats ever broke out?
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Registered User
Joined: Jan 2003
Posts: 108
From: Rock Falls IL
Has anyones valve seats ever broke out?
My valve seat fell out of my head the other night and caused abunch of damage on my new rebuilt engine... is there any reason this happened ? The car did not over heat. there was no knock befor this happened . was this just a case of bad luck or what?????
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Joined: May 2003
Posts: 19
OMG-
Were the heads worked on at all? were they a complete assembly with the shortblock?
The valve seats REQIRE a certain amont of press. especially into a head like the LT1. If it does not have enough press, the seat will literally fall out of the head due to the different expansion rates of aluminum and steel. If it wasnt overheated (which wouldnt really matter in this case, the seat should have enough press to withstand extremely high tems without falling out) I would have a SERIOUS talk with the engine builder.
This is not your fault. I would be pissed. It is bad luck, but it is due to someone else's mistake.
Were the heads worked on at all? were they a complete assembly with the shortblock?
The valve seats REQIRE a certain amont of press. especially into a head like the LT1. If it does not have enough press, the seat will literally fall out of the head due to the different expansion rates of aluminum and steel. If it wasnt overheated (which wouldnt really matter in this case, the seat should have enough press to withstand extremely high tems without falling out) I would have a SERIOUS talk with the engine builder.
This is not your fault. I would be pissed. It is bad luck, but it is due to someone else's mistake.
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Joined: Dec 1998
Posts: 209
Our Datsun 510 had a valve seat that poped out, after 275k miles.
With aluminum heads, the valve seats are hardened steel rings that are pressed into the head. Depending on the manufacturing tolerances, age, wear, heat etc. they can work loose, although its rare.
Curios, was it the intake or exhaust seat?
With aluminum heads, the valve seats are hardened steel rings that are pressed into the head. Depending on the manufacturing tolerances, age, wear, heat etc. they can work loose, although its rare.
Curios, was it the intake or exhaust seat?
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Joined: Apr 2000
Posts: 1,070
From: Austin, TX or Texas State University at San Marcos
When i got my cam put in one of my valve seats was cracked and almost broke. I was lucky i put the cam in when i did or i would have dropped a valve into my engine............
Chris
Oh yeah and i had NO previous head work done and only 65K on the engine!!!!!!! ****ty GM quality i guess.
Chris
Oh yeah and i had NO previous head work done and only 65K on the engine!!!!!!! ****ty GM quality i guess.
Thread Starter
Registered User
Joined: Jan 2003
Posts: 108
From: Rock Falls IL
there was no major head work done and none to the valve seats.
I match ported the heads and that was it. they came off My stock engine and that only had 60k on it !!!!!!!!!!!!! So about $600 later im going to be putting it back together!
I match ported the heads and that was it. they came off My stock engine and that only had 60k on it !!!!!!!!!!!!! So about $600 later im going to be putting it back together!
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