how can you tell sti and uk v6 heads apart? many thanks

 

STi V5~6 will have:
ID3 Inlet valve's.
ED3 Exhaust valve's.
Under bucket/inner shims.
STi ID banding on cams as below





UK heads will have:
ID2 Inlet valve's.
ED2 Exhaust valve's.
Over bucket/ outer shims.

Mick

 

Thanks Merlin.