Replacing intake and exhaust valves?

Question:
Do you need to lap the valves prior to installing them? Or can you just drop the new ones in and put everything back together?

Answers:

What happens if i add a diesel full in to not diesel car?

Now-a-days, just drop them in. (lubed of course)
The tolerences of manufacturing are much better today than they were in the past.

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95 Montero 3.5 Engine Intake manifold question?

You should lap them for pattern check.

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I am about to buy a 2000 (X) Vauxhall Comfort 1.0L..?

you have to make sure they will seat before you drop them in,by doing so,you have to make sure the seat is good and clean.

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I have a 2003 Oldsmobile Alero with approx. 86000 miles on it, and I have a security light problem?

I take it you had the head repaired or replaced? Go to parts store get small tube of valve seating compound. If you do have the tool to spin them in hand take a rubber hose and attach at the top of valve while in head and then apply a small amount of of compound are valve seat and spin the hose with your hands to seat. That way you can see where the valves are seating and if proper.

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Vans radiator bubbling??

Don't lap them. That's an old way to make burnt valves seat a little better but it's not good for new valves because the point where they contact the seat shifts a little when the engine warms up and the uneven surface it leaves behind will shorten the valve and seat life, and disrupts the fuel/air flow. If you have the heads off a good way to check the seating is to pour gummout into the chambers and see if it leaks past the valve seats.

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