Posting the link to gfacter's FS thread. These can be installed with the head on the block... no need to remove the head! Especially good if your car is run hard or has over 50k miles.

gfacter's FS thread

 

$415 is a great price

 

 

bump

 

how much boost would you need to run for these parts to be of any benefit?

 

It's not really about boost that I'm aware of. By purchasing upgraded retainers, you're buying insurance that helps reduce the chance of dropping a valve via a cracked retainer. High mileage motors should have the retainers checked regularly as it is much cheaper to replace these than having work done after dropping a valve.

Personally, I'll be raising my redline to 9500 rpm and this is a must along with the springs. For the record, I had over 12psi on my motor(CTSC). This is why I was going to purchase these. As it turns out, I needed to have more work done to my head because of the damage that occurred when a sprk plug electrode broke off and decided to do a jig on my piston face. , so I'm having them do everything at once.

 

 

Hey I just bought these!

Tuner

 

Bump.

Still for sale....

 

must-resist-spending money.....