Hello everyone,

I'm struggling to find information on the cam profiles that came standard on all imprezas.

Although it seems like all pre-01 cars had the same head castings (with better flow characteristics than later models), sti and RA included, some say the V-Limited may have had much better cam profiles, close to WRC specs.

Do you have any information on these as I might have a deal on V4 STI RA V-Limited heads to go along with a 2,5L STI short block to make 420hp ;-) ?

 

I guess nobody knows then ?

 

See post #10 of the below thread:-

https://www.scoobynet.com/general-te...ion-3-2-a.html


In it is a link to another thread 'let's play a game', which may be of use...

 

Thanks for the reply, however the information is very much sparsed, and the only good one I found is that STI v3/4 have 8,5mm lift.

What I was looking for was for each model (STI v1-10, TypeR, Type RA, etc etc) the lift AND duration, to compare and see if there is a pair out there which can flow enough for 420 hp between 5000 and 7500 rpm included, on a 2,5L. Now this is clearly not achievable with standard WRX heads, which don't flow well at higher revs.

And at first sight 8,5mm lift on STI v3/4 is not sufficient either, although the valvetrain seems ready for 8000rpm.