This is what I would check, If he has done a leak-down along with a pressure test on the coolant then it could be lean because of timing..Originally Posted by Mr. KiDD
Not very common but in this case unless it has a Hairline crack in the coolant passage or Block, also a Warped block or head would cause this But unless you have done ether leak down or coolant test you will never know..Just my
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:Also If your unsure about some timing marks then you need to search online.. 