400 boring extent
Elder User
Joined: Jan 2004
Posts: 887
Likes: 0
From: Colorado
My 400 is .060 over, and runs great. It is very rare that it will get hot. The best way to be safe is to take the advice of your machinest. With the way scrap prices are right now, alot of old engines are finding their way to scrap yards, and being melted down. My advice would be to take as LITTLE out of the walls as possible to clean it up so you can have a few more rebuilds left on the block you have now.
Junior User
Joined: Feb 2007
Posts: 80
Likes: 0
From: altoona
the guy I bought my truck from,told me it was one of those comp. truck cams. not sure what one it is, but it works very well. dam thing could pull a house over. has an edelbrock intake and a 750 edelbrock carb.
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Laughing Gas
Joined: Nov 2003
Posts: 898
Likes: 1
From: southeren Oh
I would never bore a block just for the extra displacement or for the extra performance that will provide.
Look at it this way: A 400 that goes to a 408 only gains 2% in displacement.
Gains are much easier to come by with raising compression, improved breathing
in working or replacing the heads and cam.
And it will not shorten the infinite life of the block.
Look at it this way: A 400 that goes to a 408 only gains 2% in displacement.
Gains are much easier to come by with raising compression, improved breathing
in working or replacing the heads and cam.
And it will not shorten the infinite life of the block.
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New User
Joined: Jan 2008
Posts: 21
Likes: 0
Well, you don't have to. Everyone is entitled to their opinion, and everyone can do whatever they want with their engine. I plan on boring mine and beefing it up. When it craters, I'll get 460 or something. The only reason Im messing with this 400 is because it was given to me.
Posting Guru
Joined: Jul 2007
Posts: 1,355
Likes: 1
Well, you don't have to. Everyone is entitled to their opinion, and everyone can do whatever they want with their engine. I plan on boring mine and beefing it up. When it craters, I'll get 460 or something. The only reason Im messing with this 400 is because it was given to me.
Laughing Gas
Joined: Jan 2006
Posts: 883
Likes: 7
From: New-brunswick,Canada
I bore my block .030. 3 cylinders have more than .030 in some spot. My machinist drive 3 sleeves and bore to .030. To my opinion don't overbore for power but just enough to make it run.