Block filling???
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Senior User
Joined: Sep 2002
Posts: 107
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From: home
Block filling???
Has any one herd of taking a 390 that has been bored 060 over filling the block in with filler and bore even more and making a 428 out of it? I was wondering if any one has done this and if it is very strong. I am thinking about doing this for a towing aplication in a 71.
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Block filling???
This is a bad idea for what you are going to use the block for. You should be able to find a 390 block that goes to 4.13" with thick enough cylinder walls. You may have to sonic check a couple. There is minimal benefit of going to a 4.13" bore. Ford started doing this with the 406 to get every pony possible out of it in the racing world. A 410 will only loose a couple ft. lbs and no horsepower over a 428. Filling the block will make the filled part of the cylinder very hot. People race with filled blocks becasue they are running down the track for 1/4 mile and they get a chance to cool the engine. They would not last very long in city traffic towing something. If you want to go to a 428 bore get a 73 or later pickup block or a 361/391FT block.
