Single Avcs heads v's original Vi STi heads?

What are the differences? (like port size, squish volume etc)

Advantages or disadvantages over my original head type?

I need to know as I cannot source a decent pair of 99-00 heads for under crack pipe prices.

AVCS will be disabled & they will run my Crower 272 cams.

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[CENTER][SIGPIC][/SIGPIC][/CENTER]
[CENTER][COLOR=#ff0000]Built Ej207: Semi-closed RA Cases - Wiseco Forgies - Manley rods - BC 272 cams - GDA Heads - billet f/whl - Vi-pec - WbO2 - 800cc Yellow tops - TD05-20G - 409Hp ath @ 1.75bar on E85[/COLOR][/CENTER]

http://www.tomei-p.co.jp/news/Report-EJ25-V1.html

I'm lead to believe that the AVCS heads in general have slightly larger ports than non-avcs heads. there is a lot of conjecture and people in the US tend to believe that all JDM-yo cars have 500% bigger ports etc and if its spec-c then it must be bigger. I'm sure Joe/tino who have done a little more research into it will chime in

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MY93 Impreza GX 1.8L, 0hp, 0nm