Ported LS7 heads help needed
02-06-2019, 05:31 PM
#1
Ported LS7 heads help needed
I purchased these LS7 heads used and was told they came from Lingenfelter. After talking to Linginfelter it appears they didn’t come from them. I am happy with the heads as the guides are tight and they are CNC ported but was wondering if anyone might be able to identify who might have done the work. The only identifying markings that I see is both heads have the number “26062” hand scribed on the 1st intake runner.
02-06-2019, 05:50 PM
#2
Melting Slicks
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
02-07-2019, 06:49 AM
#3
Safety Car
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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.
02-07-2019, 09:53 AM
#4
Thanks for the info. When I called Lingenfelter the person I talked to said they generally put the number on the side of the head, but he had never heard of them ever putting a marking on the intake runner. I’m not upset at all with the workmanship of the heads, it just would ease my mind knowing who did them.
02-07-2019, 10:02 AM
#6
looking at the picture I took it’s hard to tell how the porting was done because they look smooth as if they were done with a dremel. Later I may take a better picture and show the tooling marks that definitely were from a ball nose endmill with extremely uniform spacing. If they were done by hand I would love to meet the person that did them!! There was also some work done in the chambers, although it’s hard to tell with the carbon.
02-07-2019, 10:46 AM
#7
Melting Slicks
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
02-07-2019, 03:25 PM
#8
Team Owner
Check with TSP. Looks like could be TSP 265 program heads.
02-07-2019, 11:12 PM
#9
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.
02-08-2019, 08:58 AM
#11
Team Owner
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St. Jude Donor '05
CNC, someone went in with a tootsie roll and tried to get rid of the tool marks. If the guides check out run em
02-08-2019, 04:50 PM
#12
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.
02-10-2019, 09:20 AM
#18
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.
02-10-2019, 03:44 PM
#19
Le Mans Master
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.
Last edited by Dan_the_C5_Man; 02-10-2019 at 11:38 PM.
02-10-2019, 05:43 PM
#20
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 you own research and then come to a conclusion.
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 you own research and then come to a conclusion.