Scratched bore reassembling shortblock

Number 4 cylinder oil retaining ring scratch cylinder. Pulled piston rehoned gonna try it what do you guys think about .001 deep .Every thing fresh ughhhhh

is that a crack???

that's a crack

Holy Batcrack Robin!

Gouge, crack, whatever... not good.

not a crack block just magged

I would agree...scratches usually are straight as a string...cracks not so much

Unless you dropped something harder then the bore in it, it does lookie like buttcrack, buttman.

UMMM did you by chance file your own rings?

That is a crack - no doubt time for a sleeve

I will take your word for it and assume that is not a crack.

It looks like there is some flashing over the edge of the scratch making it appear as a crack though? I can see the skipping of the ring in the gouge after looking close at your picture. I have ran bores that were pitted pretty good but never a long, horizontal wound like that. What kind of ring are you using? Can you hone it another thou and make it go away completely?

How much hp are we talking?

its not a crack the thing everyone thinks is a crack is actually standing proud. The pic was before i remove piston and rehoned

C A rings plama moly standard tension 416 360-1 head ported 266 @50 .637 cam 500 vert 4.10 gear hp should be 600 to 625

It looks like a crack to me, you can use heat to make sure. I've used heat guns, hair dryers, propane torches to help identify cracks in cast iron, apply heat and watch closely to see if it moves, grows or change how it looks
Way better to find out now before reassembling it
BTW, if it was sticking above the cylinder wall, what would cause that It should have flatten out with the honing unless you use a dingle berry hone

The block sonic tested well over .200 in that area dont know how i would .have cracked the wall tapping a piston in.

Get it magnafluxed, then you'll know for sure.

k just had it magged and cooked before new ring and bearings

Hone it and run it. Less area there than in your ring gap.You ought to see what dirt track guys run.

I missed the mag post. Doh.

Yep, run it.

No way in the world that you could have caused that crack, NO WAY
I've assembled more than one motor, I see straight scratches in the new honed cylinder a lot from me not getting the file to fit ring ends smooth enough to not scratch the cylinder walls, none of them have ever looked like your does s
Me thinks your shop did not mag that cylinder wall, take it back and have them look at it now to be safe
I've had several good auto Hi Po machine shops in SO CA miss external cracks on several different 906 heads that where cracked under the exhaust ports, most shops do a lot more other brands than BB Mopars and neither one was aware that those freeze cracks are not uncommon on 906 heads

um I mag my own stuff at my friends shop that has been building my motors and my fathers motors for over 45 years. So no i did not miss this. I have assembled alot of motors and made a mistake. Thanx for alll the opinions WOW

Let us know what it runs once you have it back together!

So what does it look like after the hone?

Kevin

71Pan- I don't think anyone was talking down to you. People were just giving you their best advice based on their experiences and we all have a little passion around this type of stuff. Please report back what you find and how it goes. Good Luck!

Thanx bore looks pretty good. Motor together

did that myself once on a 318 Magnum, somehow the skinny lower rail on an oil ring got folded over.... soon as piston cleared the ring compressor and wouldn't move I went "ohhh $#!t..." took it back and had it re evaluated at machine shop, they honed it out and said "run it".... but I'm afraid to... that was 10 years ago and that bare block is still sitting unused.... gonna get it bored and buy matching pistons to the new bore when it gets used.... 0.007" bore to piston clearance on that one hole seems too much (I don't have forged pistons and this engine isn't being built to crazy enough power levels to need them)

Have the skirt coated on one piston, call it good.

I wouldn't fret much over being a couple thou over size in the bore. Will change your ring gap more than anything else.

Thanks for posting motor back together,This the first motor ever i didnt total assembly my self heads valve springs etc. I found 1 guess 939 springs i guess on the heads. The box listed 936 spring Difference 130lb at 1.950 370 @1.350= 936 sprngs on motor are 145 @1950 426 at 1.9250 I guess 939 both 1,538 odi break cam in without inner springs and Amzoil br oil. Everything went great.I bought head fully ported 360-1 heads by BGR Called Bob abut heads he had flow numbers about heads t he motor was built by BGR racing,Long story short to motor to my guy flowed heads and put crank connecting rods
s bore honed assembleds heads etc. put whole motor together. Had indy rocker on motor and could not keep lash. Just set valves took it out starting popping at 6900. Number on rocker pushed out adjuster flatten cam, cam 271 @ 50 637 lift used aszoil oil. Going with tool steel lifters 266 @ 50 cam .637motor is 11.66 to one buying HS rockers also.Going back to doing everything spring height assembly EVERYTHING, Been doing thin for 35 years , Some thing my father told me i did to due always, Cleanliness Patience and measure everything TWICE . My fault fault for not following procedure

Would you please post another picture of that scratch in that cylinder after running it

That would be very interesting and educational