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Old 06-15-2011, 12:27 PM
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Barnsnake Barnsnake is offline
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Join Date: Nov 2003
Location: Parker County, Tx
Cobra Make, Engine: LoneStar LS427 , 427 Windsor
Posts: 381
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Hey Paul,
I'm no EFI expert so I'll stick to the basics. Given the things you've tried, it appears you're convinced it's pre-ignition/detonation knock.
When this engine was rebuilt were stock parts used? No high compression pistons, etc?
Were the heads milled and/or the block decked? Was the cam changed? Do you have the equipment on hand to check whether the cam is in time?
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