Maßnahmen bei verschlissenen Ventilführungen im LS7-Kopf

[Chiado]

Infos/Vermutungen zum Thema Bronzeführungen im LS7 Kopf:

https://forums.corvetteforum.com/c6-z06-...heads.html

Quote:
Originally Posted by Les
Powdered metal guides....interesting.
Yep and there's a reason for that

I just got off the phone with the guy who does TFS's durability testing, has these heads on his dyno right now and will for at least the next month plus. He said all his experience shows running a bronze guide in a head/engine like the LS7 will definitely have poor life expectancy, this is why TFS spends considerably more money to use PM guides and NOT bronze. He was VERY clear, if you have bronze guides in your LS7 they WILL wear out considerably faster than PM guides, there is no debate about this fact.

This should give those who have done the typical bronze/SS 'fix' some cause to at least consider a periodic wiggle test

As for flow numbers, the 393 figure was achieved at .700" lift, at .600" they flowed 375cfm. My experience with TFS advertised numbers is that they are definitely NOT over estimated. Also remember this is being done with a small 260cc port. The stock port is 270 and I can only imagine how big they get with a typical porting job.

There is a good probability TFS will offer a ti intake valve option and I lobbied strongly to also ensure they would at least test the drilled out Ferrea exhaust valves if not the GM sodium valves too.

Cheers, Paul.