fireblade37

iTrader: (1)

Thanks

merlin24

iTrader: (1)

Version 1~2 WRX going by the :
Cam markings
Valve Codes - Inlets I252 Exhaust E283
Remains of the Carbon Composite head gaskets on the head faces.

Big End failure on No.4 by any chance ??

Mick

fireblade37

iTrader: (1)

Cheers mick, piston woes i think, was told the heads/cams were from a ra, i have the block crank etc, not much good to me.

ZEN Performance

Early hydraulic wrx heads, can still be from an RA as the first WRX RAs were of this type. Looks like a pair of anchors to me.

fireblade37

iTrader: (1)

lol, what do you mean by anchors?

merlin24

iTrader: (1)

Boat Anchors - not worth a lot tbh

fireblade37

iTrader: (1)

Right lol, any one want some anchors??

joz8968

iTrader: (13)

Prob get around £30 on eBay for 'em (IF they sell)........

john5f

iTrader: (3)

Pardon my ignorance but why are they no good?

joz8968

iTrader: (13)

It's not that they're 'no good', as such.

It's just that they they're hydraulic ones and are the 'runt' of the Impreza heads. Good for around 'only' c.380bhp, so people tend to upgrade to STi v.3/4 ones if needing to fit new heads (direct fit, keeping the v.1/2 IM). That way they get a 'free' potential power upgrade in the process...........

john5f

iTrader: (3)

Thanks for that. I guess the hydraulic liifters are less precise than the solid ones at higher revs.

merlin24

iTrader: (1)

In a nutshell - yes.
Hydraulic lifters tend to suffer from 'pump up' ( filling of oil at full extension as the cam comes 'off lobe' ) at higher rpm, this in turn will result in valve float ( valves not closing/seating on the seats ) and will give you a loss of power and in some cases - bent valves/broken valve springs.

Mick

joz8968

iTrader: (13)

Also when running the WRX v.1/2 heads at their maximum flow, they can suffer weird surging/fluttering issues which does strange thing to power fluctuations at the top end...

john5f

iTrader: (3)

Thanks guys. Thought that might be the case.