An intriguing development...

[dynomatt]

Today I fitted 98 Subaru WRX valves, springs, retainers, collets and buckets to my spare head...fitted fine. Camshafts will require modification as they sit higher than before, but it makes for an easier regrind opportunity as the base circle needs to be reduced.

Meaning, max lift on the standard springs is increased from the 9mm (ish) of before to 10.91mm. However, the buckets are shim over and STI Ver 3 WRX's are shim under and are the same bucket diameter.

Therefore with this valve setup, 10.5mm lift is possible without expensive modifications.

Food for thought.

Matt