P1Drifter

iTrader: (7)

as title realy, does anyone know what is done exactly ? am i right in thinking the edge of the combustion chamber is just feathered out to avoid the sharp edge or is it more involved than this ?

also can anyone advise me on what head gasket thinkness to use for a standard 2.5 block with sti3 heads ?

any advice much appreciated.

TimH

iTrader: (11)

Here's what was done to my 2.0l heads before they were fitted to the 2.5l.

Broxi

iTrader: (11)

I put my v2 STI heads straight onto my 2.5 using the 1.2mm 2.5 Steel gaskets.... car has been great since done.

TimH

iTrader: (11)

Might depend on the boost and power you're after. The combustion chambers on a standard 2.0l head will be inside the bore, and there is a risk that the edges of them become potential hotspots, causing det. Therefore the mapper may have to back off the advance a little to make sure that doesn't happen.

In my case, the build is good for 500bhp and I'm not taking any chances

fastboyslim

iTrader: (2)

If i may ask, who did your heads and at what price?

TimH

iTrader: (11)

Done as part of a package by Subaru4You so I don't know the cost I'm afraid. I believe the heads were done by Sabre Heads - Home

fastboyslim

iTrader: (2)

Nice one mate!

P1Drifter

iTrader: (7)

thanks for the picture and the info thats great

P1Drifter

iTrader: (7)

one other thing how much material was removed from the head then ? and how much did it affect the compression ratio, was it easily resolved my gasket thinkness ?

Thanks

TimH

iTrader: (11)

I'm sorry, but I don't know - all this was handled by Subaru4you who built the engine for me. I know the chambers were cc-matched, that's all I'm afraid.

Sorry not to be more help

P1Drifter

iTrader: (7)

lol dont worry, that picture is great just printed it off to show the guys refurbing my heads so you've been a great help already.