There is a crack in my block cylinder on my 99 gst. Will .20 over get this out?

I wouldn't even attempt it. I would just toss it there's no way to tell if it will keep cracking even if it looks like its gone.

It is not all the way up and I am thinking .20 - .40 could get it out. I have a spare 95 block but wanted the split thrust design.

Doubt a simple bore will get that out, good chance it goes thu the wall into the water jacket. But a sleeve installed will fix it.

Man I wouldn't use that thing...that's like building a house on a cracked foundation...why take the risk. Bare blocks are cheap...I sold my old 7 bolt in great shape for 60 bucks.

Take it to a Machine shop and have them Magnaflux the block, Only they can tell you how extensive that crack is. There may even be other cracks that you cannot see.

BogusSVO said:

Doubt a simple bore will get that out, good chance it goes thu the wall into the water jacket. But a sleeve installed will fix it.

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Do this

the only thing i would use that block for is a boat ancher .

$60 wow, i cant even find one let alone if I did it would be over 150 bare block.

That 100% needs a sleeve.

um crack is bad, mmmkay?

Sorry I couldn't resist.

RWD4G63 said:

That 100% needs a sleeve.

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I'm sorry, but what is a sleeve?

horizontalkev said:

I'm sorry, but what is a sleeve?

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A bore insert. Some diesal engines are made with just sleeves. The cylinder isn't part of the block.

MJcanada said:

A bore insert. Some diesal engines are made with just sleeves. The cylinder isn't part of the block.

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Really?! I learn something new every single day.

horizontalkev said:

Really?! I learn something new every single day.

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All the honda kids have been doing it for years, popular brand is Darton, I know some of our sponsored vendors sell some. But if you are ballin on a budget, and think a 150 bare block is expensive, sleeves are probably not for you.

So is it just pressed in? I'm assuming the sleeve is made of steel, and being pressed to aluminum I can't see any other way.. From my experience, steel and aluminum together causes a detrimental reaction how does that work? Also, I know steel and aluminum hear up at different rates making the block and/or sleeve susceptible to cracking.. I'm just not sure how they overcome these issues, I can't see any thing other than steel being used as the sleeves material or am I over thinking it?

horizontalkev said:

So is it just pressed in? I'm assuming the sleeve is made of steel, and being pressed to aluminum I can't see any other way.. From my experience, steel and aluminum together causes a detrimental reaction how does that work? Also, I know steel and aluminum hear up at different rates making the block and/or sleeve susceptible to cracking.. I'm just not sure how they overcome these issues, I can't see any thing other than steel being used as the sleeves material or am I over thinking it?

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The head is aluminium the block is steel.

horizontalkev said:

So is it just pressed in? I'm assuming the sleeve is made of steel, and being pressed to aluminum I can't see any other way.. From my experience, steel and aluminum together causes a detrimental reaction how does that work? Also, I know steel and aluminum hear up at different rates making the block and/or sleeve susceptible to cracking.. I'm just not sure how they overcome these issues, I can't see any thing other than steel being used as the sleeves material or am I over thinking it?

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You're over thinking it. Every aluminum block on the planet has steel sleeves pressed in.

Installing a sleeve into a cast iron block isn't a big deal. It's around $200. It's the aftermarket sleeves from places like Darton and AEBS that are more expensive.

What you need is a Dry Repair sleeve, The Darton sleeves mentioned above are a wet performance sleeve, the honda boys will spend about $2000 to get the sleeves and custom machine work done.

A repair sleeve is simpler sleeve to install, about any decent machine shop can install one with out an issue.

The cracked cylinder will be over bored to about .003 smaller than the od of the repair sleeve for a press fit.

Then the cylinder with the sleeve will be bored, and hopefully the whole block, when the sleeve is pressed in, it can and will distort the cylinders on either side of the one with the sleeve.



The sleeve in my hand is for a 4 inch bore block, like a 327/350 chevy or a 302/351w Ford

The green machine in the back ground is a boring bar.

TThe appox cost to have a sleeve installed is $100 parts and labor.