how can you tell if heads are sti ones

been offered some to fit my 94 RA,but the lad is unsure what year they are off
and if they are defenitly sti ones

they are still fitted to block (which has a suspect snapped conrod)

anyone no how i can tell without stripping heads down

 

You will need to remove a cam and see what is below, if its an RA it should have solid tappets with shims like this

The shims are pretty hard to get now

Mark

 

my orginal engine is a RA
i was offered some sti heads to fit my RA (was told they will improve performance)
once its been mapped

but the lad was unsure they are defo sti heads
he said i can take engine and remove heads and check to see they are sti ones
what am i looking for to confirm they are sti heads
are valves a different size

anyone

 

bttt anyone

 

This answer has been posted above

 

If they have a oval coil hole, you can remove the valve covers and see if the tappets are "solid". On a WRX you can clearly see the shim.

V3-V4 STi heads should look like this when you have the valve cover off


If they have a square coil hole like this, you need to take out a lifter to see if they are V2 STi RA.


If the lifters look like this, RUN


Cheers

 

thanks for that one mate

 

Sorry for dragging this back up. But, does anybody now the letter or number on a V2 STi RA valve? And what power could they product?

Cheers
Chris

 

anyone?

 

Chris,
STi Version 2 RA valve codes are,
INKO + EXKO
As mentioned above it will have Top Hat Inner Shims and also Green colour coded Valve Springs.

Mick

 

Thank you for that.would you know what power they're cappable of? Or how do they compare to the sti V3 & V4?

 

Sorry to hijack, but I'm about to pull my heads apart. Is that thing where it says 'If they look like this, run', a hydraulic lash adjuster off an early WRX head?

 

Looks like a hydraulic lifter to me.

 

Yep, hydraulic lifter from a v1-v2 WRX head.

 

How much power can you run on RA heads & STI 4 heads safely