ok so after a year, I finally get to start on my project when I was lookin over the block I found this score mark and I didnt see or notice when I got the block back from the machine shop, I can feel it when I run my nail over it, I have the pistons on order now, what should I do? should i rehone it or rebore it to a bigger size, the block sits at 85.5mm I really dont want to go any bigger because I just ordered pistons or should I just run with it? I just dont know what to do? please need ur help!

 

ask the macine shop they machined it so they should fix it

 

While I have yet to rebuild a Honda block have rebuilt quite a few Mitsubishi 2.0 blocks.I have seen this type of situation before.As mentioned,you could take the block back to the machine shop,and have them correct the issue.
Ultimately(in my case),it made no difference,compressions were good,and no oil consumption.If you are concerned about it,lightly hone that cylinder with "fresh" honing bars,and oil.

 

You guys think after a year of sitting in the garage they will do it? Hopefully they can fix it for free, or a small charge?
So you had this problem before? I'm thinking the same thing just to run it but this is my first build and I'm just being safe, don't want to put it together and ending having to replace it.

 

Kind of depends on how deep the "score mark" is, you may be able to hone it out, but if you can feel it, I would do something, start by taking it back to the shop, be prepared to pay a little as it is a year old, anything could have happened. 94

 

I have indeed seen it.Typically once the rings seat,it will be a non-issue unless of course what you are seeing is a crack in the wall.From what I can tell from the pic I wouldnt get in a twist about it.
At 54 Ive probably rebuilt 10+ DSM,s(Mitsubishis,Eagle Talons etc) and have never had an issue as long as there is good honing cross-hatch on the walls.

 

I dont think its a crack in the wall, its a sleeved block, it could be from the last time, I droped a valve and it scored it deep and the machine shop overlook , but then again it could be from something else, who knows.

Cross-hatching on the walls are pretty good, I think, hopefully like you said its a non issue thing.

 

looks like a mark from a dial bore gauge, it should be fine. if your nail is getting stuck on it then its a problem. if it doesn't don't worry about it. your going to make similar marks when checking ring gaps with a feeler gauge, if its barely catching your nail you can wrap 1000 grit sand paper around a pencil and very carefully debur that line. Rings will also make that mark, the ends tend to be sharp. i take a nail file and smooth out the edge a tad.

 

it does catch with my nail but not much tho, so i should be fine then right?

 

I would make the shop confirm that its fine before using it. Better safe then sorry

 

i would do the sandpaper thing. the problem with having the shop hone it again is everytime you hone your clearances are getting bigger. and if your blueprinting the motor you want all clearances the same. if its a standerd rebuild. then it wont matter as long as your still in spec.