V6 bore-out problem

I had my 225 block bored out 020. When I got it home, I noticed a chunk missing from cyl #1 about 1/16 inch from the bottom of the bore. The chunk that was missing was about 1/8x1/8 inch. The piston bottoms out with about 1/2 inch extending out the bottom of the bore, so it does go over it. Should I JB weld it? Not worry about it? sleeve the cylinder? junk the block? I think if it doesn't get anywhere near the rings, its not a big deal. What should I do?

Josh

 

it could be ok...strokers have to notch the block sometimes for clearing and if its at the bottom, it could use the rest of the cyl for for stabilization and you might et away ith it as long as it doesnt eat up your piston...
X2 on return to machine shop for mic'ing just to be safe.

 

No it didn't throw a rod. The hole wasn't there before the bore out job.It was there afterwards. I think there must have been a porous section that he cut into while boring. My brother, a mechanic, told me it probably won't be a problem because it is so low. I thought I'd get other opinions/ experiences.

Josh

 

What you found was probably a casting bubble, or where an air bubble was trapped in the metal when it was originally cast. I have the same issue with my block. Unless the rings of the piston move over it, Don't worry about it. And even then, it would depend on if the oil control ring rode over it, or a compression ring. From the sound of your description it sounds like neither will. Unless the hole goes through to a water jacket it shouldn't be a problem where it is at the bottom of the cylinder. When I had my block bored out, we didn't find it until we were about .40 over. We took it to .60 and it was still there, although smaller. It is in the bottom of the throw, and the rings don't ride over it. I thought about JB welding it, and even looked at some other options like sleeving, etc. I decided since the rings wouldn't touch it, and that by the time the piston was near this point in its travel the valves would be open anyway. Valves open equal no cylinder pressure, and therefore no chance of 'blowby' caused by the small hole. I have had mine put together since '99 and it runs fine, burns no oil, and if I had it to do over again, I would.

On the other hand if you need an excuse not to use that block, I'll give you $50 bucks for it.....

Seriously though, I wouldnt worry about it.

I would however look things over real well, and would suspect any 'machinist' who didn't notice something like that. Did he not notice, (lack of attention to detail) or did he notice and not want to mention it? (unethical) Either way I'd go and talk to them....

 

If it is as you described and the rings don't ride over it and it busted inot a water passage don't worry about it. Things like this are common with cast engines, you just have to pay attention to where there at and judge from that.

 

I agree, as long as your rings don't travel below the piece thats missing. You'll have no problem. Also, be aware of short skirt pistons. The longer the skirts the better.

 

OK cool, I'm just going to roll with it. No I think he is a good machinist, I just made him give it to me right after boring it. It was still in the machine when I got there.

Josh