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Old 09-13-2002, 11:24 AM   #1
sgwinn
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Join Date: Feb 2001
Posts: 84
Default Knockers are killing me- Help!

Help! My 1990 5.0 purchased new in 1990 with 83k on it and bone stock has always run like the wind; perfectly. now all of a sudden, under WOT my boys are knocking near the end of the rpm range, around 4000-4500. Have always run 87 octane and never had a problem. any ideas? bump the timing up help?
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