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Old 11-24-2012, 06:36 PM
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327 chevy small journal engine

I have a 327 chevy small journal that came out of a boat and will go back in a boat. I ordered main bearings (the engine was machined for .020 under mains) and what I got was sealed power 994 M 20. They fit but the oil hole on the block side do not line up with the oil hole in the block. The hole in the block is at thevery bottom while the oil hole in the bearing is odffset by about 1/2". I went to NAPA and they got me a set that was exactly the same. They asked for the engine code. On the tab is stamped 327F and E07I83U. (The middle letter is an i). I looked at Nasty online and got nowhere. Can anyone tell me what year it is and why the replacement part won't work.

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Old 11-26-2012, 03:57 PM
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Search 327 F. and you'll fine all you need to know. The marine 327 is a little different than the car version. It was probably painted Bluesih?
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Old 11-26-2012, 08:29 PM
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I'd order a set of bearings from another source and see if the holes line up. If they don't line up either, I'd get out the rat tail file and make 'em work.
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Old 11-27-2012, 06:24 AM
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Quote:
Originally Posted by john werner View Post
I have a 327 chevy small journal that came out of a boat and will go back in a boat. I ordered main bearings (the engine was machined for .020 under mains) and what I got was sealed power 994 M 20. They fit but the oil hole on the block side do not line up with the oil hole in the block. The hole in the block is at thevery bottom while the oil hole in the bearing is odffset by about 1/2". I went to NAPA and they got me a set that was exactly the same. They asked for the engine code. On the tab is stamped 327F and E07I83U. (The middle letter is an i). I looked at Nasty online and got nowhere. Can anyone tell me what year it is and why the replacement part won't work.
You could try a set of Federal Mogul 4930 M 20 main bearings. The set I have has the oil holes centered.

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Old 11-27-2012, 08:13 AM
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It is a common blueprint practice to match the holes in the block with the holes in the upper half of the main bearings in order to provide additional oil to the rod bearings.

Example: Rod bearing oiling is a sore spot with Pontiac engines. The three center 5/16" oil feed holes in a Pontiac block are larger than the oil holes in the upper half of the main bearings. I drill out and chamfer the main bearing oil holes in the bearings to 5/16" to match the oil feed holes in the block. No special fixture in needed, just lightly chuck the upper bearing half in a vise, drill out the hole with a 5/16" bit and lightly touch the new hole with a tapered steel burr then polish the bearing with a Scotch Brite pad.

If the feed hole in the block is mismatched, scribe the new hole in the block that matches the hole in the upper half of the main bearing. Remove the bearing, then enlarge and taper the hole to match the scribe mark.

Last edited by MouseFink; 11-27-2012 at 08:21 AM.
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Old 11-27-2012, 03:12 PM
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You could try a set of Federal Mogul 4930 M 20 main bearings. The set I have has the oil holes centered.

Or slot the bearing. No need to grind the block.
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