Opinions on Sleeving an Engine


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By Oldmics - 14 Years Ago
Well the most recent 312 that I acquired should be resleeved on all 8 cylinders.

It is original bore size but too far gone for allowable boring.

My normal machinest is not a fan of sleeves (neither am I).

The folks who dipped the engine (Chemstrip) suggest speaking to another machine shop who resleeves engines all the time.There position is that most new engines are sleeved design and that sleeves are O.K.

I"m just looking for opinions on needing a single sleeve or also multiple sleeving on the Y Block engine.

I"m NOT gonna sleeve this block as I have a few more 312s to explore to find a useable core.

Tell me what you think.

Oldmics

By 314 - 14 Years Ago
i never saw a block that wouldnt clean up at .040.or is it pitted or something.
By Speedbump - 14 Years Ago
If it's the original bore I can't believe it can't be bored.  Maybe there is a difference in what is acceptable.  I don't have a problem with .060 on most older and many newer blocks.  .040" is a slam dunk IMO.  Before you throw that block away get some other opinions.  Sleeves, properly installed, are a good fix.  I don't know about eight of them.  On a very rare block that was low performance it might be worth the time and money to do it.  I did a V-12 Lincoln flathead that had all six on one side sleeved back to standard, maybe at the factory.  I bored all the cylinders .030 and the thing ran fine. 
By kevink1955 - 14 Years Ago
My 312 had a wrist pin clip let go and score a cylinder, I thought the block was junk but my local shop said it could be sleved. While cleaning it up to send to the shop I discovered another cylinder had already been sleved. All cylinders were 40 oversize so the new sleve was punched to match the rest. A quick hone job on the other cylinders and reassembled it

That was about 15,000 miles ago and it is still going strong, It's only a stock engine but it runs great.

PS: found out it was a 312 when I gave the block to the shop, I thought it was a 292. How often does the story go that way, most think they have a 312 and it turns out to be a 292 or 272

By charliemccraney - 14 Years Ago
Sleeving is fine, but if you have to do all 8, get another block. Around here, 8 sleeves is $1200.00. Not worth it unless you have some kind of sentimental value in the block. Alternatively, you can do a sonic check of the block to see just how far it may be bored. If you're lucky, there may be enough meat that you can still use it.
By PF Arcand - 14 Years Ago
You say it is original bore size, but can't be bored enough to clean up. What happended to it? Is it terribly rusted? Most 312 blocks will bore .060 over and still have reasonably thick cylinder walls, unless the block had a bad core shift. Ford sold pistons for them up to .040 over.
By mctim64 - 14 Years Ago
Nothing wrong with sleeves when done properly, but Charlie has a very good point.  I sold a 312 block a few years back for $150 and I've seen others go for the same.  Do you have something aginst the 312 internals in a 292 block?  If you have a ECZ 292 who would know the difference?