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Old 06-05-2011, 11:57 AM   #6 (permalink)
EcoModding Lurker
Join Date: Jan 2010
Location: Oregon state
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I read some where than those grooves started a crack in the cylinder head.

The better way is: take off a head and look at combustion chamber, if it is uniform in color throughout leave it alone if some potrion is clean put dimples in there (clean means fuel wash condition exist ) dimpling restores boundary layer action and improves burn efficiency.
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