Thread: 400 SBC Rod Bearing Failure
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04-06-2006 06:15 PM #8
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- Dec 2003
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- Car Year, Make, Model: 86 S-15 Jimmy sb 400
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400s' have a larger stroke than a 350 and therefore produce more compression. A common problem is that people tune with 4 degrees too much ignition timing which causes predetination and takes out both rod and main bearings as you described. Maximum timing is 34 degrees when fully advanced which means the timing needs to be dialed in somewhere above 3000 rpm.Last edited by TyphoonZR; 05-05-2006 at 08:51 AM.
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