5.3L cylinder head. Which side should be normal?

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rockola1971

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How long have you own the vehicle? Looks like one head has been replaced. The darker one looks like that head has at least 200k miles.

Look at the stamping on each head to see if they match.
Im going to have to totally agree here. I have never seen an LS engine with considerable amount of miles on it not having matching patina on the valvetrain and tops of the cylinder heads. Drivers side head looks to have a fair amount of miles on it and from what I can see in the pic completely normal visually. That Passenger side head looks like it was either replaced or pulled, cleaned, likely rebuilt within the last 50k or less.
 
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wazzabie

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How long have you own the vehicle? Looks like one head has been replaced. The darker one looks like that head has at least 200k miles.

Look at the stamping on each head to see if they match.
unknown history till 44k miles. total miles is 190k
 
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wazzabie

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There has been a coolant leak with this motor. Engine oil analysis report says coolant in motor oil.
 

ivin74

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There has been a coolant leak with this motor. Engine oil analysis report says coolant in motor oil.
You might have the troubled 706 heads on that suv. To identify those heads look for the stamping shown on the pictures below.
 

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