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The Water Cooler
General Discussion
Car guys - should I do a top-half rebuild on my GM 5.3L?
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<blockquote data-quote="MacFromOK" data-source="post: 3235652" data-attributes="member: 40864"><p>It's possibly just a head gasket. If so, I'd do nothing but replace the head gaskets.</p><p></p><p>Warnings against doing head replacements (or even a valve job) on high-mileage engines are valid.</p><p></p><p>Either one increases compression quite a bit (which can be hard on worn rod/main bearings), but it also increases vacuum on the intake stroke, which can start sucking a lot of oil around worn rings and turn it into a genuine oil burner.</p><p></p><p>Been there/done that, as a young mechanic in the '70s.</p><p><img src="/images/smilies/new/drunk.gif" class="smilie" loading="lazy" alt=":drunk2:" title="Drunk 2 :drunk2:" data-shortname=":drunk2:" /></p></blockquote><p></p>
[QUOTE="MacFromOK, post: 3235652, member: 40864"] It's possibly just a head gasket. If so, I'd do nothing but replace the head gaskets. Warnings against doing head replacements (or even a valve job) on high-mileage engines are valid. Either one increases compression quite a bit (which can be hard on worn rod/main bearings), but it also increases vacuum on the intake stroke, which can start sucking a lot of oil around worn rings and turn it into a genuine oil burner. Been there/done that, as a young mechanic in the '70s. :drunk2: [/QUOTE]
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Car guys - should I do a top-half rebuild on my GM 5.3L?
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