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Old 05-02-2003, 05:58 PM
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Post information needed on FE 428 / 390

I am building a hot 390 for one of my trucks, and went to put the main bearings in and the rear main bearing guide tab does not line up with the slot on the main cap, they are the correct bearings for a 390, but have reason to believe it is a 428 block, how do you differentiate an fe 390 block and a FE 428

P.S three of the four oil holes for the mains do not line up that well. <img src="graemlins/crash.gif" border="0" alt="[crash]" />

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Old 05-02-2003, 07:45 PM
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its been said that a 428 block will have ' 428 ' cast on the jacket in one of the freeze plug holes.
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Old 05-03-2003, 03:42 AM
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Bearings are the same for a 390/428 block,there was an earlier version bearing but it has a narrower thrust surface, the only real difference is the 428 has a bigger bore. 428 was cast into any and all types of blocks so that isn't an indicator, the oil hole mis-alignment is on all the FE blocks. We always take a die grinder and open them up to match the bearing, it's cheap insurance.
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