Repairing piston damage

[91r/t]

You mention building a stroker twice. Is this already a stroker motor? If you are building a stroker, you will not be using those pistons anyways.

Have the block checked. A 0.060 block will be fine. Just have it sonic tested to be sure something odd isn't going on.

New block or new pistons. Either way. But if this is just a beater, I'd consider bore and new pistons. Then you can focus on the 500 motor.

Why did you tear into the motor to begin with?

This is the stroker I speak of. I tore into it because I was changing the cam and I was using oil. Once I found the rockers chewed part I wanted to check the rest of it to make sure the bearings were OK. The good news is the crank and all the journals and bearings looked OK but the bad news is is shown above. I took the Pistons to work today and they will clean up no problem. The motor has always had low oil pressure at Idle. I’m not sure if the rockers we’re just set up wrong or what but I’m pretty much going to take the rotating assembly and start from scratch and build a motor that I know is correct. I’ve done that before so I’m not going to dive into how many little things caused this problem but rather just use the parts I know are good and go from there. There’s no way that the deep scratches clean up with .030” more taken from the cylinder walls. I work in a machine shop and inspect parts all day and I know the scratches are definitely deeper than .015”. The block was already bored .030 over so I’m afraid it’s pretty much junk.

 

[91r/t]

OK give that block a few strokes with a RIDGID hone and see what happens how many thou to clean up?
no glass beads they are everywhere you should be able to find one
use NEW glass bead
or pick all out as you are doing and sand above the rings
below the rings you want a cross hatch or you can Knurl
Knurl would work also if block cleans up with a few thou extra clearance
there has to be crap all the way though the motor so clean all the hidden spots
did you cut open the filter?

I just changed the oil very recently before tearing the motor down so I didn’t bother cutting the filter open. There’s really no metal anywhere in the motor so I’m confused but there is a bunch of sludge in the bottom of the pan that maybe once was something? My rockers were all chewed to **** and had low pressure at idle. Either or I’m starting with this fresh standard bore 440 block and keeping this one if I ever build a stock motor. The only reason I’m doing that is because all of my internals are balanced and my Pistons are already 30 over so I might as well just use the stuff I got and have an extra block punched 30 over and stuff my internals in it.

 

[91r/t]

I realize that the block is bad the way it sits but DO NOT throw it out. Big blocks are stating to getting hard to find and lots of people would be happy to re sleeve it if they knew it wasn’t cracked..... including myself. Good luck on the rebuild

For sure man! I will hang onto it for a more stock build. Figure it’d be great for that when your already buying pistons and such. Just makes more sense to do it this way for my current build and dilemma.