So to make a long story short, I've just had my motor rebuilt due to a cracked piston causing too much pressure in the block. During this rebuild I had the motor resleeved with some dry sleeves. I also had the machine shop build the motor this time due to me not having any time outside of work and college.
Well I got the motor put in and started runs great! It has a very strong sounding idle and just runs goood, however; when I'm under the hood with it running and I hit the throttle I hear a knock when it is under load. My first thought was a tuning issue since I knew it would need a tune due to putting a little bit bigger piston in it during the build. Brought it to the tuner and he said he wouldn't tune it cause he didnt think it was a tuning issue. So I brought it back to the machine shop for them to hear it. At first they thought rod knock, then they thought timing issue because they doubted the rod bearings going bad since they were brand new and everything was miked (or however you spell that) and nothing was off when they built it. They tried changing the timing slightly but the sound did not change so they went back to saying rod knock.
Now heres the kicker, took the oil filter off to see if we could find metal shavings in it that should be present in the case that the rod bearing were going out and we didnt find anything, not even little flakes. So now not only am I stumped by it but the machine shop is too.
Going to bring it up for valve adjustment to see if it helps, which they doubt it will but it needs to be done anyways.
Does anyone know what could be causing the knock or has this happened to anyone else before?
Any help would be greatly appreciated, I have not been driving it any because I didn't want to damage it any if I could help it. I desperatly need my car back so that I'm having to drive my gas gussling truck which I have to fill up every 4 days going back and forth to work. 
Well I got the motor put in and started runs great! It has a very strong sounding idle and just runs goood, however; when I'm under the hood with it running and I hit the throttle I hear a knock when it is under load. My first thought was a tuning issue since I knew it would need a tune due to putting a little bit bigger piston in it during the build. Brought it to the tuner and he said he wouldn't tune it cause he didnt think it was a tuning issue. So I brought it back to the machine shop for them to hear it. At first they thought rod knock, then they thought timing issue because they doubted the rod bearings going bad since they were brand new and everything was miked (or however you spell that) and nothing was off when they built it. They tried changing the timing slightly but the sound did not change so they went back to saying rod knock.
Now heres the kicker, took the oil filter off to see if we could find metal shavings in it that should be present in the case that the rod bearing were going out and we didnt find anything, not even little flakes. So now not only am I stumped by it but the machine shop is too.
Going to bring it up for valve adjustment to see if it helps, which they doubt it will but it needs to be done anyways.
Does anyone know what could be causing the knock or has this happened to anyone else before?
Any help would be greatly appreciated, I have not been driving it any because I didn't want to damage it any if I could help it. I desperatly need my car back so that I'm having to drive my gas gussling truck which I have to fill up every 4 days going back and forth to work.
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