I'm interested in upgrading my valvesprings and retainers on my 05 EVO 8 w/o having to remove the head. Is this do-able with the right tools? Have ya guys done it and what would you advise me to do?

I've already done my own cam and camgear install, so I wanna go a bit further by upgrading the valvesprings and retainers to handle to HKS 280's revving to 8000 RPM's

 

yea, you need the tool to do it but it can be done, we're doing a set this week!

 

yea it can be done, rather easiy just make sure u cover the holes so that the keepers and stuff doesnt fall into the chamber.

 

I found it to be quite frustrating, but it's not brain science. I wouldn't bother for HKS cams.

 

yes it can be done pm sabastian458

 

yeah, get the snap-on kit. just plug the oil drainback holes with paper towels in case if 1 of the valve keepers pop's out.

if your getting dual springs, buy new valve stem seals too, since you have to pull the old seals to install your new spring seats.

 

humm sounds like a lot of work.......just for HKS 280 cams

 

It probably is a lot of work for any HKS cam set, and with little return.

Nevertheless, for those who want to know how to do it, it's easiest to do if the cylinder is pressurized via a compressed air fitting with a spark plug thread.

 

Yes, that's a big part of it. I made a setup to put compressed air in the cylinder with parts from my compression tester. I'm pretty sure I got this idea from the how-to that already exists on this site.

 

Lift is the same as stock on the HKS cams, why bother?

 

good call.... but to be devils advocate...maybe the additional duration is bad for the valvetrain? Or one can argue revving to 8000 RPMs is even worse?

 

if your on the stock bottom end, i wouldnt spin the motor much past 8k anyway.

there are a lot of people who have experinced what they call "spun bearings" who had twisted their engine past 8,500.

yeah, other people have spun higher, but if your concerned about valve springs, i would be concerned about my bottom end when going past 8k.

 

Actually, the opposite is true.

 

I see.... nahh I'm not gonna spin the motor more than 8000 RPM's anyway, and I only go that high when I drag/highway race (which is a rare event anyway )

 

Yea it can be done, i made a tool that bolts to the head and you can compress each spring. I can put some pics up of it if you want