Right on! Thanks Boostin for hopping in and sharing with us. I have a set of OEM lifters ready to go into your guys's stage 3 cylinder head once I get it back and a new set of GSC lifters for back up if the oem ones go bad.

Is it safe to say that valves staying open won't be a problem just in case I do decide to run the GSC lifters at a later point in time with your cylinder head?

-pal215

Very sad to hear that a great company like GSC can't produce a lifters that won't create problems for a high performance car like the evolution. Hoping GSC will see this problem and fix them. Maybe make a new lifters that will be in spec of the oem lifters.
And let everyone that have problems with their lifters , can exchange to the future lifters.
I'm also putting my oem lifters back into my car. But the oem lifters will eventually starts to make that tapping noise again. Anyone with that problems with that noise like mine with the oem lifters?

This thread got me thinking how one would go about measuring installed tip protrusion. So I got to searching and found this video. Hopefully this makes things more clear to those that (like myself) had no idea how you would find this measurement.




By the way, if this is not what you guys are talking about, please correct me. From my understanding this is how you would measure this though.

Howulikemyevo, Read the above again. If the head work is done correctly you won't have any issues with ANY lifters.
If its done incorrectly , then its POSSIBLE that the longer GSC lifters would be compressed all the way and still hold the valves open.

You can't blame GSC for a problem they didn't create.

True. This also makes me feel like Mitsubishi Engineers designed the oem lifters to have a greater degree of freedom that would compensate for head work done incorrectly and allow the valves to close all the way anyway. In other words, the lifters can be compressed lower than the GSC lifters.

Curious to know if anyone with oem lifters has had their valves stay open after head work. GSC makes great products, but they might have designed the lifters to a strict oem spec.

-pal215

You are very correct. GSC making these lifters higher than oem spec. Grounding down the tip of your valves to compensate the higher lifters is NoT the safe way because it won't leave the keepers much space left to hold the springs in place when doing a 40+ boost. Would anyone here take that CHANCE?!?!?!?
I know I don't. The damage that it would cause $$$

Don't get me wrong , I'm still using GSC other parts on my Evo. GSC R2 cam and GSC beehive 5041 springs and retainers. But I don't want a $180 GSC lifters to damage my head and would cause me $1500+ to repair or even replace my entire head if the keepers pop off at high boost.

So I'm playing it safe with my oem lifters back in, GSC lifters is out!

The question is..... Does anybody have any problems with the oem lifters. Such as it making ticking and tapping noise??? Or can they handles under high boost condition???

there is some evidence from a high end build on MLR that stock lifters will bleed down at high rpm and will not produce adequate valve lift... hence the owner using GSC lifters and complete GSC valvetrain..

Just because they dont fit your out of spec head, doesnt mean they are made wrong. GSC lifters have been out for a long time in many builds. If you want them to make OEM spec lifters, what would be the point of upgrading? They would just start to tick and fail like OEM

But wsm says there is 0.5mm/0.02 inch to ground the valve tip.

My problem with gsc lifter was after i pushed my mechanic little to measure this, out of limit valve stem projection so had to go +1mm larger valves and exhaust valves were corroded.

I can guarantee you if there is leeway in the OEM setup, it is not intentional. The valve tip protrusion spec is actually there to ensure the rocker arm has proper geometry. GSC likely design there lifter around the valve being within spec.

Absolutely not true, just looked at the picture and compare the hieght of the GSC and oem lifters. How can you say it's within spec or the geometry is even near closed to oem spec when it's that different hieght!?!??

When turning my GSC R2 cams with the GSC lifters, the valve didn't closed all the way. After putting the oem back in, the machine shop got it to closed. The only option is to ground the valve tips down but I don't want to.
A lot of people loss compression but didn't know that it was their GSC lifters that caused that.
The only thing that I might have question and never measure is my Brain Crower valves. I don't really know if all aftermarket valves for my Evo 8 is the same hieght?!?!?
Anyone know about this, give me some input to understand please.

For me to believe any of this let the machine shop get online and explain it. I've been around the car repair business long enough to know the shop will tell the customer anything to remove the customer from their hair and then they get back to trying to figure out the problem.

You still haven't posted what you're installed height of your valves was. Or if the lifters were bled down before install. In the pic you posted, the lifters are fully extended. What they extend to doesn't matter. What matters is that they compress enough attain zero lash (on a properly set up head), which is what hydraulic lifters are intended to do.

Why can’t you grind the bottom of the lifter like you would grind the tip of the valve stem? It might be just a few thou of an inch away so 2-3mm. Is this possible or would also bring problems to the valvetrain?

I’m having a similar issue except I went from OEM to ITM and exact same issue starts ticking. So now I’m wondering if I have a valve issue. Bought the car ticking assumed it was lifters. Replaced them and since went back to my old OEM and they tick like HELL!




Is it possible to measure with just the valve cover cover off or would it require removing the head to check valve length...? Hope that makes sense. Thanks in advance.




Evo 9 60k 441whp