Ported LS7 heads help needed
 

I have lingenfelter heads and they actually scribe a number on the exhaust side of the head that identifies their work. Im not sure where they came from but runner looks pretty clean

To me, it doesn't look like a CNC machining pattern. It appears to be a hand porting job. I honestly think you're out of luck having someone identifying the heads by looking at one intake port. The numbers "may" help.

Lingenfelter uses OEM iron guides. You have bronze. That rules them out anyway.

this is true also^^^^^

mine are NOT smooth like that (you can see all the cnc marks) ill post a pic of mine, those are a hand blend for sure (but look great)

but being they are "fixed" its still not a bad idea to replace the guides with them being a relatively cheap part

Check with TSP. Looks like could be TSP 265 program heads.

https://cimg1.ibsrv.net/gimg/www.cor...588b5109d.jpeg
I agree that they aren’t Lingenfelter heads although they did say that that they have on some occasions used bronze guides, I’m sure at the customers request. Here is a closer look at the tooling marks and I believe they are cnc.

Yep, see the telltale marks on this photo.

CNC, someone went in with a tootsie roll and tried to get rid of the tool marks. If the guides check out run em

Thats my plan. Just installing Ferrea exhaust valves and BTR dual springs. The reason for the post is more out of curiosity to see if anyone can identify who might have done the work. As “Unreal” mentioned, I will check with Texas Speed & Performance.

Looks like some clean porting, I'd run em. You might have better luck tracking through previous owners of them.

You should know stock Ti intakes and bronze guides are not a good combination.:cheers:

CHE mag bronze guides have no issues with the oem valves.

Tsp was able to look up what was done to my heads by me giving them the previous owners name. My heads also didn’t have any markings, just numbers.

That's not Katech's position, and they know a thing or two about it.. :cheers:

Thats funny because they require bronze with their moly coated Ti valves. Moly is the superior coating but the factory CRN is very good also. A few cylinder head companies use bronze with factory valves. WCCH and Advance Induction just to name 2.

The original factory CrN coating is abrasive, which is why Katech pushes the use of Moly coated stems, because the head vendor they use, WCCH (yes, NOW Katech offers in-house services, but that only started last year) didn't have access to PM guides that hold up better to the rough coating...

It's a domino affect; one component change impacts another.

And just because a shop does something doesn't make it right - GM is a Billion dollar company, and look what a mess they managed to create. Never trust anyone implicitly, try to do your own research and then come to a conclusion. :cheers:

100% agree, I’ve used CHE products before with great results. Which is why I used them in my head fix. I use a local machine shop for my machine work. Never had an issue with them so far.