V3 OR NOT V3......MAYBE V4

well the time has come to buy a set of sti heads for my build.

but have been told v4 are best then told by other ppl v3 are better?????

can someone that knows what they are talking about plz advise me what would be better for 400bhp, want my car to be quick off the line all thru the rev range.

which do i buy???

thanks guys and gals

I think the heads are identical the cams may be slightly different but either would easy support 400 hp and quiet a bit more as well

v3 closed deck - v4 semi-closed deck as i know

we are talkin about sti heads, think your talking about blocks???

Excuse my ignorance, so the V3 STI has the stronger closed deck block then??

Sorry to HI-JACK..........

sounds that way mate.

learn summit new everyday lol

hi The v3 does not have the closed deck bloke.the heads on the v3 and v4 easily take 400bhp

dont worry about blocks, open, semi closed and closed will all take over 400bhp with the relevant internals.

oh back to the heads, both will do the job, think it may be harder to find v3 heads though and they do suffer from cracks in the casing

HI v3 have as was described to me as the laireyer cams, which i presume means they have a shorter lift and makes for faster excelleration
but i doubt that a mere mortal would notice the difference..

Jay it is the later version 5/6 heads that suffer from cracking round the spark plugs not the v3/4 heads

Banny

how can i tell v3 sti heads from non sti heads?

v3 closed deck - v4 semi-closed deck as i know

If you don't know something for sure, please don't post as you are just adding confusion.
Closed deck blocks have NOTHING to do with cylinder heads.
Ver 3 and 4 cars ie Phase 1.5 all have open deck blocks as do ver 5 and 6 cars. SOME Phase 1 & 2 cars have CDBs.
As Banny says, cracked heads are common on ver 5 and 6 STis but not usually 1-4 or ver 7 onwards.
STi 3 or 4 heads will have the shims under the bucket whereas the WRX is shims on top of the bucket. Same for STi 5,6 etc.