boring 400 60 over please help
Posting Guru
Joined: Jun 2002
Posts: 1,099
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I saw a 400 go .080 over once but don't know how long it lasted. Don't take a chance going .060 without having the block sonic checked. There's no other way of knowing about core shift or if the cooling system was maintained properly over the last 25-30 years. It's not that expensive.
Elder User
Joined: Jan 2004
Posts: 887
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From: Colorado
My 400 is .060 over. No overheating or vaporlock problems after it got worn in. Its worked for me, It cools fine, and i live at 9118'...
Have the block checked first though, just to be safe, and take it to someone who knows what theyre doing.
Have the block checked first though, just to be safe, and take it to someone who knows what theyre doing.
More Turbo
Joined: Dec 1999
Posts: 582
Likes: 5
From: New Orleans United States
.060 over
I bought a NAPA short block that was .060 over. It was the first engine I ever assembeled, and still runs great 30k miles later. Doesn't overheat, and has full fan shroud.
Posting Guru
Joined: Mar 2005
Posts: 2,068
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From: western montana
I recently took apart a 060 400 that had unsolvable heating problems according to the mechanic- didn't know it was 060 until we broke it down then he said 060 often leads to heating problems-lack of metal or something.
I'm not real comfortable with 040 but thats what i'm building. theres too many blocks around to build a 060 imho.
I'm not real comfortable with 040 but thats what i'm building. theres too many blocks around to build a 060 imho.
Posting Guru
Joined: Dec 2002
Posts: 2,003
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From: chicago burbs
Roger, did you check to make sure the head gaskets were on the right way as you took the problem 400 apart? i just don't buy into the "bored too far causes a hot engine" concept.
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Junior User
Joined: Apr 2005
Posts: 98
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From: Whitehorse Yukon
When i did my last 2 400's they were both .060 over. both still goin strong. What we did notice when it was bored was that we had to use the head gasket as a guide so the firing ring on the head gasket would not overhang into the cylinder . We used the largest bore head gasket felpro makes. The cylinders had to be bored slightly off center. I recomend always using torque plates as well.IF sonic testing is availble definetly have that done. Saves alot of guess work. I will add also that the engine shop i worked in a few years back, routinely bored 400,s .060 with no problems i knew of in the 7 yrs i was there.
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Posting Guru
Joined: Mar 2005
Posts: 2,068
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From: western montana
grclark; wasn't my motor- i got it after it was out and stored for a while so I don't know what they did except put a bunch on silicone down two jackets in the block- ended up being water jackets I think. lol....mechanic didn't know that...maybe the builder didn't like the customer. funny how my memory fades...not
Posting Legend
Joined: Sep 2001
Posts: 30,255
Likes: 37
Boring the block to match the gaskets is NOT a good idea. Find a set of gaskets that fit properly. Gaskets can be way off at times. If you guys only knew how they were made... 
The bores must be aligned with the crank and thrust bearing.
The bores must be aligned with the crank and thrust bearing.
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Senior User
Joined: Oct 2003
Posts: 368
Likes: 3
From: Longview Tx
thank you all for your very helpful info. i took it down to the machine shop today and they said that it would clean up .040 over and be fine. even with a crank case full of mud & water this 400 still had a ton of power. these motors ROCK!!! thanks again...
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