hi would uk 98 heads be ok heads for an ej257 conversion in to a 93 wrx ?

cheers david

 

do a search m8 his has been asked befor

 

With the correct gasket thickness, Yes

I take it you are using the 93WRX inlet manifold?

 

yes i think it would be easyer to use the 93 inlet or can you rewire the 98 one


cheers david

 

The MY98 inlet can be fitted
I think it needs mods to the trottle position sensor.

 

I wouldnt use the UK cams though.

Rob

 

so what would be the best heads to use as i want to keep the original engine as complete as i can?

 

the actual heads are the same, its the valve drive train that is different.

STI3 seems to be the choice but WRX/RA etc would be an improvement over UK IMHO.

Rob

 

How much of a difference between between the UK & JDM WRX cams? or are there any other differencies head wise?

Mark

 

STI heads run under-bucket shims and sodium valves AFAIK, UK heads DO NOT!

Russell

 

simbo,
Are you thinking about MY98 UK heads and MY93 WRX heads?

If you are then they are very different!!
The MY93 heads use hydraulic tappts (no shims) this is great as there is no expence shimming the buckets but have a disadvantage at higher revs The casting is different so you can't just fit later tappets.

The MY98 heads will have over bucket shims (not as secure as the STI's), Though the casting is the same as the STI's

If you can get the MY98 heads cheap, I'd use them as this will leave the WRX lump pretty compete You can always get the UK cams re-profiled