285whp??... Haha, it's back - with 320whp!!

[bazza]

Originally Posted by dynomatt

I think there's a standard valve length and stem diameter in the EJ20's isn't there? They're definitely a 6mm stem, but the length was the same...Google tells me it's 104.75mm. I just used those ones.

They are short, so a shim is needed that sits on the valve...here's one of my shims. Sits on the top of the valve stem.



Matt

Thanks for that info Matt. This certainly makes a bit more sense. The EJ20 has many different valve lengths. You may recall Subaru have used quite a few different types of bucket, some hydraulic with rockers, basic hydraulics, shim over, shim under and shimless. IIRC there are 3 different valve lengths not including SOHC stuff.

Hopefully this afternoon I will have some measurements for both the MY99 WRX valve and the MY98 WRX valve to publish.

If the length is an issue as you've indicated, I'm more inclinded to machine out my hydraulic buckets into solids to suit each position.