Does anyone know for certain how much lift it will take for the oem valve spring retainer to come in contact with the oem valve stem seal?

I see that cosworth offers a valve spring that can be used with the oem retainers

http://www.cosworthusa.com/store/pc/...9&idproduct=86

the website claims that the springs dont coil bind till over 12.0mm

I just want to know if it is possible to achieve ~11.5 lift with the oem retainer if i were to persue something like that.

if someone in the socal area has a evo 8 cylinder head off a car, i will gladly go over & take measurements & post the results.

TIA

 

Interesting find. I've known about these for awhile now:

http://store.forcedperformance.net/m...=Lancer-Engine

Makes me wonder if they're the same thing. From what I understand there isn't a Ti retainer on the market that is lighter than the OEM aluminum retainer.

I can't answer your question with any authority, but I've seen 'somewhere' that retainer to seal clearance limits total lift to about .445" with factory valvetrain geometry.

 

Thanks

 

does someone have a cylinder head off their car / spare that they can measure?

 

You are 2 days too late my friend i just installed my freshly built head on short block.