I'm in Southern Ontario, so pretty far . If you can figure out shipping I could send them after I disassemble. Not sure about the too rich thing , mine ran low 10s AFR many times in the early stages of tuning and no hint of problems . I just thought of something else though, are you using the oem fuel cut rev limiter? And have you hit the limit ? In my early reading on this site there were a few that had engine damage after hitting the limiter, could be it cuts fuel part way through a cylinder's injector pulse - don't know

 

Weak coils could 100% cause the plugs not to fire properly, same with low quality wires. I only run D510C coils, I don't think early LS1 coils are as strong. This past summer, I had a misfire under boost and nothing would fix it. Turns out the cheaper spark plug wires I installed ( which work great on my N/A Camaro, so I won't knock them ) just weren't up to the task of firing my plugs. I bought a set of Taylor 10.4MM wires and the misfire was fixed.

 

Hello,

Work started to pick up so I havemt had a chance until now to look at my old tune and my fuel cut off is at 6950 rpms. I am confident I didnt spin it that high.

I did look into shipping and have a rough idea of the cost. If youd like i can private message you for more info to get a more accurate price to ship.

I do have cheap NGK wires from Canadian Tire, they were just replacement wires for a stock engine. So I will look into upgrading those as well

 

Hello,

The weather got a little warmer so I finally pulled the intake and driver side cylinder head.

Found more oil than i expected around the intake gasket and to my surpise the pistons and cylinders cleaned up fairly good with quick brake kleen and rag. Im wondering if I blew the turbo seal and it was sending oil through. The catch can only had what looked like water with a tiny bit of oil on the top.

Valves look good at a quick glance but i will get them looked at.

There is no hole in my #7 piston like I thought with the crappy bore scope picture. The ls9 small bore headgasket was very wavey when I pulled it off.

It was getting a little chilly again so I gave up and will have to do some more investigating.

 

So what was the original issue, was it missing or something? Could you have just fouled out a spark plug or two?

 

The engine was down on power, blowing alot of smoke out of the exhaust. Compression was down on both banks of the engine. So I assumed it was a ringland or a hole in the piston in cylinder #7. A head gasket issue on the passenger side since every cylinder is at 100psi on that side. From the bore scoped picture I thought I had seen a hole in the #7 piston but the quality of the picture had deceived me.

When this all happened i noticed that my oil pressure was stuck at 60psi either at idle or driving it didnt move. Im curious what would be causing that.

I also had oil leaking out the back of the engine so im also guessing I have a damaged rear main seal.

Im still planning on pulling engine to go through it at this point.

 

Might as well, can't see the ringlands with the pistons still in the engine. I'd check to make sure the rods aren't bent either.

 

I ran the ngk wires for a few years with no issues, I did switch to moroso wires last yr when I planned on upping the boost. Another thing to mention is that I started with br7s gapped at .025 , after about 25000miles I put in a fresh set , the old ones the gap had grown to. 034 but it still ran fine and did a personal best at the time. You may have a problem with the coils or wiring/ grounds

 

Had another response in there but it got left out somehow, yes you can message me about the pistons /rods . Will take me a week or two to get that block apart as I'm backed up in the shop and my engine lift is out on loan but I can get that back soon I think

 

Im not in a rush to get them, let me know whenever you have them removed.

On another note, I started looking into my cylinder heads and all the exhaust valves were leaking, some worse than others. I started pulling the #7 cylinder valves out and upon doing so I found the valve seal was pushed up on the exhaust valve and was floating on the valve stem. Secondly I starting cleaning the surface to start lapping when I found a Crack between the exhaust and intake port.

Now ill be sending my spare set of cylinder heads out to be resurfaced and checked over.

 

Is that a crack in the top photo?

 

It sure is!

 

If that valve seal was off and that cylinder was sucking oil in past the valve, that could cause detonation.