ls7 valve guide problem only existed around 2006?

[JAFWF]

Originally Posted by joelster

Try finding a set. I don't know if they are better, worse, or the same, but I do know that they are extremely rare. Most LS9 cars are museum pieces anyway.

I did, the first three sites had them, two bare, and one fully assembled. They were OEM heads.

[void_kp]

attached blackstone oil report. seems like my heads are still good

[acammer]

Originally Posted by JAFWF

A question, why aren't people using LS9 heads?

Because the LS7 heads feature a completely different port, and larger intake valve appropriately sized to the 4.125" bore size of a 427. Going to a LS9 head on an LS7 would be a step backwards in terms of performance.

Our take on the LS7 head is that there are a few factors that result in the failures. When we "fix" a set, we go with a quality set of guides, and extent them to provide additional support through the port. Recoat the intake valves to ensure the titanium can't go to work against the guides, run a quality aftermarket exhaust valve suited to the application, be smart about your valve-train configuration, and let 'em rip.

We've got a little write up of our own, for inquiring minds:

https://gwatneyperformance.com/ls7-v...-need-to-know/