GSC R2's with Supertech duel valvetrain is a NO GO
so i measured the thickness of the oem stem seals & supertech VS-M6.6E/I, lets say the distance/material between the top of the guide & the top part of the stem seal that is visible when installed, looking to pick up some clearance for the 12mm lift.
oem seals ~0.167"
S/T seals ~0.165"
not much difference there = still not enough for me @ the moment.
oem seals ~0.167"
S/T seals ~0.165"
not much difference there = still not enough for me @ the moment.
Greg told us that there isn't going to be any difference between valve stem seals as far as the retainer to stem seal clearance goes.
These cams are definitely a measure each case by case. Every head is difference especially one from mitsubishi or one that has been modified.
With that said less headache using beehives and more HP.
These cams are definitely a measure each case by case. Every head is difference especially one from mitsubishi or one that has been modified.
With that said less headache using beehives and more HP.
supertech behives
Turns out that there is a 2mm shoulder portion of the retainer that does nothing...maybe a carry-over from a dual spring design or something, regardless I will knock ~1.5mm off the bottom of these tomorrow.
the keepers are still 0.5mm deep into the retainer, so i am not worrying about them pulling through or anything like that.
No disrespect to greg @ gsc, i personally dont know what seals he measured. Besides that, I dont believe everything i read on the web, let alone evom, i also recall reading that someone offered a low profile seal & i wasnt sure who it was, so i decided to measure them.
it took all of about ~2 minutes to set up the indicator on the granite plate to measure the 4 seals.
Now people have an idea about how thick the oem & supertech stem seals are for the evo 8/9 head, between the top of the guide & rubber bit above the spring.
Turns out that there is a 2mm shoulder portion of the retainer that does nothing...maybe a carry-over from a dual spring design or something, regardless I will knock ~1.5mm off the bottom of these tomorrow.
the keepers are still 0.5mm deep into the retainer, so i am not worrying about them pulling through or anything like that.
it took all of about ~2 minutes to set up the indicator on the granite plate to measure the 4 seals.
Now people have an idea about how thick the oem & supertech stem seals are for the evo 8/9 head, between the top of the guide & rubber bit above the spring.
Last edited by Aby@MIL.SPEC; Apr 9, 2013 at 06:19 PM.
^^ That should work out for you Aby. Yours sound just like mine. 1.5mm would be perfect for me also. I also don't think the seals are an issue. Not with these cams anyway. I think a low profile retainer like the gsc will make these cams work with OEM seals. Or mod the one you got! :-)
supertech behives
Turns out that there is a 2mm shoulder portion of the retainer that does nothing...maybe a carry-over from a dual spring design or something, regardless I will knock ~1.5mm off the bottom of these tomorrow.
the keepers are still 0.5mm deep into the retainer, so i am not worrying about them pulling through or anything like that.
No disrespect to greg @ gsc, i personally dont know what seals he measured. Besides that, I dont believe everything i read on the web, let alone evom, i also recall reading that someone offered a low profile seal & i wasnt sure who it was, so i decided to measure them.
it took all of about ~2 minutes to set up the indicator on the granite plate to measure the 4 seals.
Now people have an idea about how thick the oem & supertech stem seals are for the evo 8/9 head, between the top of the guide & rubber bit above the spring.
Turns out that there is a 2mm shoulder portion of the retainer that does nothing...maybe a carry-over from a dual spring design or something, regardless I will knock ~1.5mm off the bottom of these tomorrow.
the keepers are still 0.5mm deep into the retainer, so i am not worrying about them pulling through or anything like that.
No disrespect to greg @ gsc, i personally dont know what seals he measured. Besides that, I dont believe everything i read on the web, let alone evom, i also recall reading that someone offered a low profile seal & i wasnt sure who it was, so i decided to measure them.
it took all of about ~2 minutes to set up the indicator on the granite plate to measure the 4 seals.
Now people have an idea about how thick the oem & supertech stem seals are for the evo 8/9 head, between the top of the guide & rubber bit above the spring.
Yourself found little to no difference between stock and supertech.
Hard to say without checking.
Last edited by project_skyline; Apr 9, 2013 at 06:34 PM.
what are you referring to? i apologize for not following. i never mentioned anything about installed height.are you suggesting that my installed height is less than what it should be?
so i measured the thickness of the oem stem seals & supertech VS-M6.6E/I, lets say the distance/material between the top of the guide & the top part of the stem seal that is visible when installed, looking to pick up some clearance for the 12mm lift.
oem seals ~0.167"
S/T seals ~0.165"
not much difference there = still not enough for me @ the moment.
oem seals ~0.167"
S/T seals ~0.165"
not much difference there = still not enough for me @ the moment.
Both the Viton/Rubber seal will have a tolerance. i can promise it isn't .002" if you want to get some what of an accurate read doing it the way you suggested grab 30 of both seals and measure them all and take the high low and an average. in my eye's .002" on a seal is the same thing.
By locators I think he means spring seats. Gsc says right there on their site to use OEM spring seats. The super tech seats are for duel springs only.
*update* I installed the gsc 5041 spring set. It gave me an extra .030" of retainer to seal clearance which was just what I needed! So now I just need to verify cam timing is correct and I will be putting my engine back in.
*update* I installed the gsc 5041 spring set. It gave me an extra .030" of retainer to seal clearance which was just what I needed! So now I just need to verify cam timing is correct and I will be putting my engine back in.
There is also the matter of the valve job on a performance head. If the valvestems have been ground this changes clearances as well as obviously altering spring pressure. I know Derek agrees with me, but I was trying to be as 100% forward as is possible that I didnt think this profile was going to work with most dual spring setups.
