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No the valve seals are between the cam and the head, under the valve spring
intake valves are the larger valves or if you count from from either end its number 2,3,6,&7 valve
It is normal to replace them.It is normal to replace them.
The idle air control valve on the Chevy Colorado actually controls the speed of your engine's idle. The valve is sometimes called the idle speed control valve.
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You can purchase a kit at most auto parts stores that includes an air fitting and a compression tool to remove the locks and change the seals.
No, oil treatment will react in the same way as regular oil. Replace the valve seals.
The head, or top part of the motor, must be removed to replace valve seals. After the head is removed take it to a machine shop and they will mill the head to make sure it is flat and also grind down the valves and replace the valve seals.
bad oil rings==head gasket== valve seals
sounds like a small block chevy...the best fix is to replace the seals. they make tools that allow you to pump air into a cylinder so you can repalce the valve seal without removing the head.
yes heads need to be removed