.060 over
03-01-2006, 10:59 PM
#31
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Re: .060 over
Originally Posted by engineermike
Do me a favor and check the wall thickness near the cracks. I'd be real interested to see if the block was thin there from core shift or something.
Sounds like something screwy went on, especially in #6. The radial hoop stress is double the axial stress. That's really strange for it to get a radial crack.
Sounds like something screwy went on, especially in #6. The radial hoop stress is double the axial stress. That's really strange for it to get a radial crack.
Be glad to when my checker comes back from repair. I used it twice and it don't do anything.Brand new too. It's not a cheap one but it wasn't $1500.00 either.($800.00)
If I forget remind me.
03-02-2006, 08:00 AM
#34
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Join Date: Jun 2000
Location: North Canton, OH
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Re: .060 over
Huh...stock 4 bolt mains?
I ran a .060" over setup for years and never had issues.
I then tried to make a .125" over bore and I ruined a 4 bolt main LT1 block. It cracked in 3 places...I really wanted a bigger bore to make use of my heads.
Turned around and got lucky...true LT4 block, Milodon billet main caps, .030", completely worked over for $700 from a local machine shop that a customer never picked up.
I ran a .060" over setup for years and never had issues.
I then tried to make a .125" over bore and I ruined a 4 bolt main LT1 block. It cracked in 3 places...I really wanted a bigger bore to make use of my heads.
Turned around and got lucky...true LT4 block, Milodon billet main caps, .030", completely worked over for $700 from a local machine shop that a customer never picked up.
03-02-2006, 09:12 AM
#35
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Location: Indiana
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Re: .060 over
well, i guess i need a final vote...
i can go .045 over and get custom pistons. all together costing me $800 with the cost of a bore and custom pistons.
i can go with the .060 bore and spend $500 with the cost of pistons and the bore.
i can go with a new block and bore it .030. total cost would be around $700 with machining and pistons. but i have to find a new block first.
(custom pistos figured with diamond oversize shelf pistons. shelf pistons figured with speed pro powerforged pistons at 300 a set).
i can go .045 over and get custom pistons. all together costing me $800 with the cost of a bore and custom pistons.
i can go with the .060 bore and spend $500 with the cost of pistons and the bore.
i can go with a new block and bore it .030. total cost would be around $700 with machining and pistons. but i have to find a new block first.
(custom pistos figured with diamond oversize shelf pistons. shelf pistons figured with speed pro powerforged pistons at 300 a set).
03-02-2006, 03:55 PM
#36
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Re: .060 over
Originally Posted by engineermike
Also, I've never seen or heard of a Chevy V-8 block that split the cylinder wall. I've seen mains break, even main webbing crack and fall out, deck surface cracks, etc., but never a crack in the cylinder bore.
I have... my old stock motor somehow managed to crack a cylinder wall 3 yrs agoish (#7 i think?) :/
Had to get a new block and everything... I would attribute this to a manufacturing defect though or something weird that happend to the car maybe a long time ago before I owned it. I still dont know why it cracked, the mechanics never saw anything like that before either.
03-02-2006, 04:30 PM
#38
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Re: .060 over
Originally Posted by 97WS6NY
I was under the impression that the LT1 blocks that were in f-body's were 2 bolt mains, and the LT1's in corvettes were four bolt mains, as well as the LT4 in the firehawk
If any body needs a virgin 4 bolt,I have one.
03-02-2006, 05:24 PM
#40
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Re: .060 over
Originally Posted by WS Sick
I recently bought an LT1 out of a 96 wrecked vette (seen them pull it out of the car) I got home to find 2 bolt mains under the pan.
Somebody wanted the 4 bolt or they replaced a blown engine with one from a Camaro.
03-02-2006, 07:47 PM
#41
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Location: Bay Area, CA
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Re: .060 over
I just call it an lt4 block so that it is known that it is a 4 bolt main, since all lt4's were. I have seen multiple vette blocks that ended up being 2-bolts. Not saying your information is wrong, just going by what I have seen.
Sonic tested my std 4 bolt block today, basically it was .239"-.270" on the thrust side and oposite the thrust(side to side) and .090-.130" in-between the cylinders.
Sonic tested my std 4 bolt block today, basically it was .239"-.270" on the thrust side and oposite the thrust(side to side) and .090-.130" in-between the cylinders.
03-02-2006, 08:04 PM
#42
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Re: .060 over
Originally Posted by MachinistOne
I just call it an lt4 block so that it is known that it is a 4 bolt main, since all lt4's were. I have seen multiple vette blocks that ended up being 2-bolts. Not saying your information is wrong, just going by what I have seen.
Sonic tested my std 4 bolt block today, basically it was .239"-.270" on the thrust side and oposite the thrust(side to side) and .090-.130" in-between the cylinders.
Sonic tested my std 4 bolt block today, basically it was .239"-.270" on the thrust side and oposite the thrust(side to side) and .090-.130" in-between the cylinders.
How much is it bored?
03-02-2006, 08:21 PM
#43
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Location: Cincinnati, Ohio
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Re: .060 over
Ive seen corvettes have 2 bolts, and Ive also seen non lt4 F bodies have 4 bolts. The general uses what ever is on the shelf.
As for the original post...
Do all the bores need cleaned up? If its just a couple what about sleeving them?
As for the original post...
Do all the bores need cleaned up? If its just a couple what about sleeving them?
03-02-2006, 08:45 PM
#44
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Re: .060 over
Originally Posted by MachinistOne
I just call it an lt4 block so that it is known that it is a 4 bolt main, since all lt4's were. I have seen multiple vette blocks that ended up being 2-bolts. Not saying your information is wrong, just going by what I have seen.
Sonic tested my std 4 bolt block today, basically it was .239"-.270" on the thrust side and oposite the thrust(side to side) and .090-.130" in-between the cylinders.
Sonic tested my std 4 bolt block today, basically it was .239"-.270" on the thrust side and oposite the thrust(side to side) and .090-.130" in-between the cylinders.
That could easily go .060" over from where it is now.... can anyone say 414 cube (or more)
03-02-2006, 08:57 PM
#45
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Re: .060 over
Originally Posted by SStrokerAce
That could easily go .060" over from where it is now.... can anyone say 414 cube (or more)
You would trust .030 on the non thrust side with a .060 overbore.
I wouldn't.
Are we talking two different things here?