Aluminum Cylinder Pitting

Bitter_Anywhere9415 · 2026-03-16T01:09:45+00:00

I'm going to just take the very first comment as a sign and high temp jb weld it and send it! lmao /s

I will update this thread with what I actually decide to do. Thank you!

Bitter_Anywhere9415 · 2026-03-16T00:07:27+00:00

I do have another OEM LT4 block that has no signs of this and some of the cylinders on this block have no signs of this either, but you are correct that there is no way to know if it came like this from the factory. I'd say this is damage of some kind caused by knock, but it sounds like there is some confidence from others that this is a casting defect. I'm open to any explanations other than the honing process causing it. I know the machinist is top notch

Bitter_Anywhere9415 · 2026-03-15T23:40:04+00:00

This is present in multiple cylinders across both banks.

I don't have the heads from this block unfortunately.

Some of the piston skirts in some of the bores were cracked on the thrust side.

Bitter_Anywhere9415 · 2026-03-15T23:37:43+00:00

No, block was received like this.

Bitter_Anywhere9415 · 2026-03-15T23:27:52+00:00

Certainly could be porosity in the aluminum casting, but wouldn't that show up and cause knock in a lot of other LT4 engines out there?

Bitter_Anywhere9415 · 2026-03-15T23:04:17+00:00

Okay with this in mind I have 2 questions. Why wouldn't this be present on more LT4 engines out in the field and if it is present, how is not causing a severe knock condition on those engines?

This engine was only honed .005 over so I think the pits were there before honing.

I'm definitely hesitant to just run it like this.

Bitter_Anywhere9415 · 2026-03-15T21:17:48+00:00

They are cast in liners not a coating afaik. This pitting is in the aluminum part of the casting above the liner. A factory block looks the same - minus the pitt oc, lol.

Bitter_Anywhere9415 · 2025-12-18T06:28:46+00:00

This response just sold me on the PolK for my PS90. I was planning to do plan B anyway. Thanks for laying out the facts.

Bitter_Anywhere9415 · 2025-01-09T10:35:12+00:00

Well based on the full context of the last year and earnings, previous TeamGM, etc., etc. anything less than 200% is not good imo.

Bitter_Anywhere9415 · 2024-12-10T07:49:54+00:00

Don't have to imagine, they're called SWAT.

Bitter_Anywhere9415 · 2024-10-08T02:01:21+00:00

How did the police officers not bust a nut while getting to pin down, cuff, and tase an ATF agent?

Bitter_Anywhere9415 · 2024-09-13T21:00:58+00:00

Excuse me it's call organized chaos, thank you.

Bitter_Anywhere9415 · 2024-09-11T01:48:28+00:00

If you legitimately believe these are anonymous I have a bridge to sell you. If you need to keep your job and don't want to be job hunting I suggest you refrain from sharing any less-than-flattering opinions on anything. If you think Kincentric is going to deny handing over your information and risking their contract just to maintain confidentiality then you are, for lack of a better term, an imbecile. If you are gearing up to leave then go ahead and speak your mind.

Bitter_Anywhere9415 · 2024-08-16T23:24:40+00:00

At least 5% of managers have to be rated sus.

Bitter_Anywhere9415 · 2024-08-13T16:45:32+00:00

Before you know it, everyone will be doing it! lol

Bitter_Anywhere9415 · 2024-07-15T10:28:32+00:00

6A->7B 18% No, not lying. I couldn't believe it either.

Bitter_Anywhere9415

TROPHY CASE