Miata Mailing List: February 1999, Message #74

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	My 90 is getting on in miles, 142k and has reached a point now
where I can go about 1000miles on an oil change (mobil 1 5w30) before I
start getting valve clatter. Also, around 5krpm, I get smoke but can't
determine the color. I contacted the dealer and he said it would run around
$500-600 to replace all the HLAs. He also threw out the option of getting
another engine for that kind of money, one with less mileage.
	If I went with an engine swap, I would like to get the 1.8. What
all is involved, labor wise and cost to swap the engine? Is it worth it, or
should I keep driving as is and rebuild this one when it hits 200k?