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Some heads have replaceable guides and you just drive them out with the head off. Others need to be machined to have inserts installed.

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20y ago

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How do you replace the valve guides on a 305 Chevy without removing the heads?

By using an air compressor to hold the valves shut, while you work on them. Each spark plug is removed and an adapter is used to screw into the plug location. This adapter is then connected to compressed air. Talk to may reputable mechanic and he can help you.The above answer is right WHEN replacing the VALVE SEALS. But the question was about replacing the valve guides. YOU MUST remove the heads and take them to a machine shop to have the valve guides replaced. NO OTHER WAY.


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What does it mean when Exhaust is blowing blue smoke?

If it blows blue smoke when starting up, that is usually the valve guides need replacing. If it constantly blows blue smoke, you are looking at piston rings. Either way oil is getting into the combustion chamber. If it's valve guides, you need to have the heads looked at, if it is rings, the bottom of the engine needs to come out.


How much does it cost to change valve guides?

Ballpark estimate is $100 per hour labor plus parts, the new valve guides price.


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