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I just got a set of refurbished heads. The only thing I am unsure about is the valve seals. The intake just has a umbrella type seal on it and the exhaust just has an o-ring on it. Do they both need umbrella and o-ring on them? Or should I leave it as is? Thanks.
 

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Some motors have them on both intake and exhaust valves, some only on the intake. I am currently redoing the springs and seals on my heads and I am going with the umbrella seals on all 16 valves. Pesonally I think the umbrella seals are far better than the simple O ring seals. The reason for them only being on the intake is because that is the most common spot for a problem occuring with start-up smoke issues. Not so important on the exhaust valves, but if you want to be sure do both intake/exhaust valves. This is just my personal opinion.
 

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Some motors have them on both intake and exhaust valves, some only on the intake. I am currently redoing the springs and seals on my heads and I am going with the umbrella seals on all 16 valves. Pesonally I think the umbrella seals are far better than the simple O ring seals. The reason for them only being on the intake is because that is the most common spot for a problem occuring with start-up smoke issues. Not so important on the exhaust valves, but if you want to be sure do both intake/exhaust valves. This is just my personal opinion.
That's right,,, The old O ring type on the exhaust only gets more oil to the guides. I understand it helps the last longer due to heat. It just fine tho..
 
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